This patchset ports CPU clock detection for MT7621 from OpenWrt
and adds a complete clock plan for the mt7621 SOC.
The documentation for this SOC only talks about two registers
regarding to the clocks:
* SYSC_REG_CPLL_CLKCFG0 - provides some information about boostrapped
refclock. PLL and dividers used for CPU and some sort of BUS (AHB?).
* SYSC_REG_CPLL_CLKCFG1 - a banch of gates to enable/disable clocks for
all or some ip cores.
Registers needed for this driver to work are in two already mapped areas
in its platform's device tree. These are 'sysc' and 'memc' nodes. Most
of other drivers just make use of platform operations defined in
'asm/mach-ralink/ralink_regs.h' but this can be avoided declaring this
two nodes to be accesible through syscon. Since these are the only two
needed control interfaces for this clock driver that seems to be the
correct thing to do.
No documentation about a probably existent set of dividers for each ip
core is included in the datasheets. So we cannot make anything better,
AFAICT.
Looking into driver code, and some openWRT patched there are
another frequences which are used in some drivers (uart, sd...).
According to all of this information the clock plan for this
SoC is set as follows:
- Main top clock "xtal" from where all the rest of the world is
derived.
- CPU clock "cpu" derived from "xtal" frequencies and a bunch of
register reads and predividers.
- BUS clock "bus" derived from "cpu" and with (cpu / 4) MHz.
- Fixed clocks from "xtal":
* "50m": 50 MHz.
* "125m": 125 MHz.
* "150m": 150 MHz.
* "250m": 250 MHz.
* "270m": 270 MHz.
We also have a buch of gate clocks with their parents:
- "hsdma": "150m"
- "fe": "250m"
- "sp_divtx": "270m"
- "timer": "50m"
- "pcm": "270m"
- "pio": "50m"
- "gdma": "bus"
- "nand": "125m"
- "i2c": "50m"
- "i2s": "270m"
- "spi": "bus"
- "uart1": "50m"
- "uart2": "50m"
- "uart3": "50m"
- "eth": "50m"
- "pcie0": "125m"
- "pcie1": "125m"
- "pcie2": "125m"
- "crypto": "250m"
- "shxc": "50m"
There was a previous attempt of doing this here[0] but the author
(Chuanhong Guo) did not wanted to make assumptions of a clock plan
for the platform that time. It seems that now he has a better idea of
how the clocks are dispossed for this SoC so he share code[1] where
some frequencies and clock parents for the gates are coded from a
real mediatek private clock plan.
I do really want this to be upstreamed so according to the comments
in previous attempt[0] from Oleksij Rempel and the frequencies in
code[1] I have tried to do this by myself.
All of this patches have been tested in a GNUBee PC1 resulting in a
working platform.
Changes in v9:
- Set two missing ret values to its related PTR_ERR in function
'mt7621_clk_probe' (also related with [3]).
- Select MFC_SYSCON in Kconfig.
Changes in v8:
- Fix kernel test robot complain about the use of 'ret' variable
initialized: see [3]
Changes in v7:
- Make use of CLK_OF_DECLARE_DRIVER instead of CLK_OF_DECLARE and
register there only the top clocks that are needed in 'of_clk_init'.
The rest of the clocks (fixed and gates) are now registered using
a platform driver. Because we have avoid architecture dependent stuff
now this has sense because we can enable this driver for COMPILE_TEST.
- Convert fixed clocks and gates related function to receive a 'struct
device' pointer instead of 'struct device_node' one.
- Make use of dev_ APIS in stuff related with platform driver instead
of use device_node related stuff.
- Add new static global 'mt7621_clk_early' to store pointers to clk_hw
registered at 'of_clk_init' stage. Make use of this in platform device
probe function to properly copy this into the new required 'clk_data'
to provide a properly hierarchy clock structure.
- Rename 'mt7621_register_top_clocks' function into a more accurate
name now which is 'mt7621_register_early_clocks'.
- Enable driver for COMPILE_TEST.
Changes in v6:
- Rewrite bindings to properly access the registers needed for the driver
making use of syscon for two different areas: 'sysc' and 'memc'. With
this changes architecture dependent include 'asm/mach-ralink/ralink_regs.h'
is not needed anymore because we access this two syscons using a phandle
through kernel's regmap APIs. Explanation of this two areas is in [2].
- Add new 'mt7621_clk_priv' struct to store there pointers to regmap handlers
to be able to use regmap operations from normal clock api functions. Add
this pointer in 'mt7621_clk' and 'mt7621_clk_gate' before register its
related clocks to make things work.
- Add Greg's Acked-by in patches 4 and 5.
- Rebase this series on the top of linux-next tag 'next-20210215'.
v5 RESEND notes:
- I am resending this as I was told to do that.
- Please, take into account Rob's comments to DT node patch and my
reply with explanation about how are the current device tree nodes
for this architecture being used in [2].
Changes in v5:
- Avoid the use of syscon. All drivers of this platform are just using
platform operations defined in 'asm/mach-ralink/ralink_regs.h'. We also
need them for some PLL registers that are not in the sys control area.
Hence, since we must use this dependency avoid to define clock driver
as a child of the sysc node in the device tree and follow current
platform code style.
- Update bindings documentation to don't refer the syscon and make
remove 'clock-output-names' property from required ones.
- Use 'asm/mach-ralink/ralink_regs.h' platform read and write operations
instead of regmap from the syscon node.
- Remove 'mt7621_clk_provider' and directly declare 'clk_hw_onecell_data'
pointer in 'mt7621_clk_init' and pass from there into different register
functions. Remove pointers to 'mt7621_clk_provider' in the rest fo structs
used in this driver.
- Remove MHZ macro and just pass values directly in hertzs.
- Avoid 'CLK_IGNORE_UNUSED' flag for gates and add a new function called
'mt7621_prepare_enable_clocks' to prepare all of them to make clocks
referenced and don't affect current driver code.
- Remove COMPILE_TEST from Kconfig because of the use of especific arch
stuff.
- Fix commit message where a typo for "frequencies" word was present.
- Make use of parent_clk_data in 'CLK_BASE' macro.
- Remove MODULE_* macros from code since this is not a module.
- Remove not needed includes.
- Hardcode "xtal" as parent in FIXED macro.
- Change 'else if' clause into 'if' clause since a return statement was
being used in 'mt7621_xtal_recalc_rate'.
NOTES:
- Driver is still being declared using 'CLK_OF_DECLARE' for all the
clocks. I have explored the possibility to make some of them available
afterwards using 'CLK_OF_DECLARE_DRIVER' for top clocks and the rest
using a platform driver. The resulting code was uglier since we only want
to use the same device tree node and the top clocks must be copied again
for the new platform register stuff to properly have a good hierarchy.
New globals needs to be introduced and in this particular case I don't
really see the benefits of doing in this way. I am totally ok to have all
the clocks registered at early stage since from other drivers perspective
we only really need to enable gates. So, I prefer to have them in that
way if it is not a real problem, of course.
Changes in v4:
- Add Acked-by from Rob Herring for binding headers (PATCH 1/6).
- Convert bindings to not use syscon phandle and declare clock as
a child of the syscon node. Update device tree and binding doc
accordly.
- Make use of 'syscon_node_to_regmap' in driver code instead of
get this using the phandle function.
- Properly unregister clocks for the error path of the function
'mt7621_clk_init'.
- Include ARRAY_SIZE of fixed clocks in the 'count' to kzalloc
of 'clk_data'.
- Add new patch changing invalid vendor 'mtk' in favour of 'mediatek'
which is the one listed in 'vendor-prefixes.yaml'. Update mt7621 code
accordly. I have added this patch inside this series because clk
binding is referring syscon node and the string for that node was
with not listed vendor. Hence update and have all of this correct
in the same series.
Changes in v3:
- Fix compilation warnings reported by kernel test robot because of
ignoring return values of 'of_clk_hw_register' in functions
'mt7621_register_top_clocks' and 'mt7621_gate_ops_init'.
- Fix dts file and binding documentation 'clock-output-names'.
Changes in v2:
- Remove the following patches:
* dt: bindings: add mt7621-pll device tree binding documentation.
* MIPS: ralink: add clock device providing cpu/ahb/apb clock for mt7621.
- Move all relevant clock code to 'drivers/clk/ralink/clk-mt7621.c' and
unify there previous 'mt7621-pll' and 'mt7621-clk' into a unique driver
and binding 'mt7621-clk'.
- Driver is not a platform driver anymore and now make use of 'CLK_OF_DECLARE'
because we need clocks available in 'plat_time_init' before setting up
the timer for the GIC.
- Use new fixed clocks as parents for different gates and deriving from 'xtal'
using frequencies in[1].
- Adapt dts file and bindings header and documentation for new changes.
- Change MAINTAINERS file to only contains clk-mt7621.c code and
mediatek,mt7621-clk.yaml file.
[0]: https://www.lkml.org/lkml/2019/7/23/1044
[1]: https://github.com/981213/linux/commit/2eca1f045e4c3db18c941135464c0d7422ad8133
[2]: https://lkml.org/lkml/2020/12/20/47
[3]: http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2021-February/150772.html
Sergio Paracuellos (6):
dt-bindings: clock: add dt binding header for mt7621 clocks
dt: bindings: add mt7621-clk device tree binding documentation
clk: ralink: add clock driver for mt7621 SoC
staging: mt7621-dts: make use of new 'mt7621-clk'
staging: mt7621-dts: use valid vendor 'mediatek' instead of invalid
'mtk'
MAINTAINERS: add MT7621 CLOCK maintainer
.../bindings/clock/mediatek,mt7621-clk.yaml | 66 +++
MAINTAINERS | 6 +
arch/mips/ralink/mt7621.c | 6 +-
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/ralink/Kconfig | 15 +
drivers/clk/ralink/Makefile | 2 +
drivers/clk/ralink/clk-mt7621.c | 536 ++++++++++++++++++
drivers/staging/mt7621-dts/gbpc1.dts | 11 -
drivers/staging/mt7621-dts/mt7621.dtsi | 87 ++-
include/dt-bindings/clock/mt7621-clk.h | 41 ++
11 files changed, 713 insertions(+), 59 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
create mode 100644 drivers/clk/ralink/Kconfig
create mode 100644 drivers/clk/ralink/Makefile
create mode 100644 drivers/clk/ralink/clk-mt7621.c
create mode 100644 include/dt-bindings/clock/mt7621-clk.h
--
2.25.1
Adds dt binding header for 'mediatek,mt7621-clk' clocks.
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Sergio Paracuellos <[email protected]>
---
include/dt-bindings/clock/mt7621-clk.h | 41 ++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 include/dt-bindings/clock/mt7621-clk.h
diff --git a/include/dt-bindings/clock/mt7621-clk.h b/include/dt-bindings/clock/mt7621-clk.h
new file mode 100644
index 000000000000..1422badcf9de
--- /dev/null
+++ b/include/dt-bindings/clock/mt7621-clk.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Author: Sergio Paracuellos <[email protected]>
+ */
+
+#ifndef _DT_BINDINGS_CLK_MT7621_H
+#define _DT_BINDINGS_CLK_MT7621_H
+
+#define MT7621_CLK_XTAL 0
+#define MT7621_CLK_CPU 1
+#define MT7621_CLK_BUS 2
+#define MT7621_CLK_50M 3
+#define MT7621_CLK_125M 4
+#define MT7621_CLK_150M 5
+#define MT7621_CLK_250M 6
+#define MT7621_CLK_270M 7
+
+#define MT7621_CLK_HSDMA 8
+#define MT7621_CLK_FE 9
+#define MT7621_CLK_SP_DIVTX 10
+#define MT7621_CLK_TIMER 11
+#define MT7621_CLK_PCM 12
+#define MT7621_CLK_PIO 13
+#define MT7621_CLK_GDMA 14
+#define MT7621_CLK_NAND 15
+#define MT7621_CLK_I2C 16
+#define MT7621_CLK_I2S 17
+#define MT7621_CLK_SPI 18
+#define MT7621_CLK_UART1 19
+#define MT7621_CLK_UART2 20
+#define MT7621_CLK_UART3 21
+#define MT7621_CLK_ETH 22
+#define MT7621_CLK_PCIE0 23
+#define MT7621_CLK_PCIE1 24
+#define MT7621_CLK_PCIE2 25
+#define MT7621_CLK_CRYPTO 26
+#define MT7621_CLK_SHXC 27
+
+#define MT7621_CLK_MAX 28
+
+#endif /* _DT_BINDINGS_CLK_MT7621_H */
--
2.25.1
Clocks for SoC mt7621 have been properly integrated so there is
no need to declare fixed clocks at all in the device tree. Remove
all of them, add new device tree nodes for mt7621-clk and update
the rest of the nodes to use them.
Acked-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Sergio Paracuellos <[email protected]>
---
drivers/staging/mt7621-dts/gbpc1.dts | 11 ----
drivers/staging/mt7621-dts/mt7621.dtsi | 79 +++++++++++++-------------
2 files changed, 38 insertions(+), 52 deletions(-)
diff --git a/drivers/staging/mt7621-dts/gbpc1.dts b/drivers/staging/mt7621-dts/gbpc1.dts
index a7c0d3115d72..7716d0efe524 100644
--- a/drivers/staging/mt7621-dts/gbpc1.dts
+++ b/drivers/staging/mt7621-dts/gbpc1.dts
@@ -100,17 +100,6 @@ partition@50000 {
};
};
-&sysclock {
- compatible = "fixed-clock";
- /* This is normally 1/4 of cpuclock */
- clock-frequency = <225000000>;
-};
-
-&cpuclock {
- compatible = "fixed-clock";
- clock-frequency = <900000000>;
-};
-
&pcie {
pinctrl-names = "default";
pinctrl-0 = <&pcie_pins>;
diff --git a/drivers/staging/mt7621-dts/mt7621.dtsi b/drivers/staging/mt7621-dts/mt7621.dtsi
index 16fc94f65486..11d1670d4339 100644
--- a/drivers/staging/mt7621-dts/mt7621.dtsi
+++ b/drivers/staging/mt7621-dts/mt7621.dtsi
@@ -1,5 +1,6 @@
#include <dt-bindings/interrupt-controller/mips-gic.h>
#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/clock/mt7621-clk.h>
/ {
#address-cells = <1>;
@@ -27,27 +28,6 @@ aliases {
serial0 = &uartlite;
};
- cpuclock: cpuclock@0 {
- #clock-cells = <0>;
- compatible = "fixed-clock";
-
- /* FIXME: there should be way to detect this */
- clock-frequency = <880000000>;
- };
-
- sysclock: sysclock@0 {
- #clock-cells = <0>;
- compatible = "fixed-clock";
-
- /* This is normally 1/4 of cpuclock */
- clock-frequency = <220000000>;
- };
-
- mmc_clock: mmc_clock@0 {
- #clock-cells = <0>;
- compatible = "fixed-clock";
- clock-frequency = <48000000>;
- };
mmc_fixed_3v3: fixedregulator@0 {
compatible = "regulator-fixed";
@@ -76,10 +56,20 @@ palmbus: palmbus@1E000000 {
#size-cells = <1>;
sysc: sysc@0 {
- compatible = "mtk,mt7621-sysc";
+ compatible = "mtk,mt7621-sysc", "syscon";
reg = <0x0 0x100>;
};
+ pll: pll {
+ compatible = "mediatek,mt7621-clk";
+ #clock-cells = <1>;
+ ralink,sysctl = <&sysc>;
+ ralink,memctl = <&memc>;
+ clock-output-names = "xtal", "cpu", "bus",
+ "50m", "125m", "150m",
+ "250m", "270m";
+ };
+
wdt: wdt@100 {
compatible = "mtk,mt7621-wdt";
reg = <0x100 0x100>;
@@ -101,8 +91,8 @@ i2c: i2c@900 {
compatible = "mediatek,mt7621-i2c";
reg = <0x900 0x100>;
- clocks = <&sysclock>;
-
+ clocks = <&pll MT7621_CLK_I2C>;
+ clock-names = "i2c";
resets = <&rstctrl 16>;
reset-names = "i2c";
@@ -119,8 +109,8 @@ i2s: i2s@a00 {
compatible = "mediatek,mt7621-i2s";
reg = <0xa00 0x100>;
- clocks = <&sysclock>;
-
+ clocks = <&pll MT7621_CLK_I2S>;
+ clock-names = "i2s";
resets = <&rstctrl 17>;
reset-names = "i2s";
@@ -138,7 +128,7 @@ i2s: i2s@a00 {
};
memc: memc@5000 {
- compatible = "mtk,mt7621-memc";
+ compatible = "mtk,mt7621-memc", "syscon";
reg = <0x5000 0x1000>;
};
@@ -156,8 +146,8 @@ uartlite: uartlite@c00 {
compatible = "ns16550a";
reg = <0xc00 0x100>;
- clocks = <&sysclock>;
- clock-frequency = <50000000>;
+ clocks = <&pll MT7621_CLK_UART1>;
+ clock-names = "uart1";
interrupt-parent = <&gic>;
interrupts = <GIC_SHARED 26 IRQ_TYPE_LEVEL_HIGH>;
@@ -173,7 +163,8 @@ spi0: spi@b00 {
compatible = "ralink,mt7621-spi";
reg = <0xb00 0x100>;
- clocks = <&sysclock>;
+ clocks = <&pll MT7621_CLK_SPI>;
+ clock-names = "spi";
resets = <&rstctrl 18>;
reset-names = "spi";
@@ -189,6 +180,8 @@ gdma: gdma@2800 {
compatible = "ralink,rt3883-gdma";
reg = <0x2800 0x800>;
+ clocks = <&pll MT7621_CLK_GDMA>;
+ clock-names = "gdma";
resets = <&rstctrl 14>;
reset-names = "dma";
@@ -206,6 +199,8 @@ hsdma: hsdma@7000 {
compatible = "mediatek,mt7621-hsdma";
reg = <0x7000 0x1000>;
+ clocks = <&pll MT7621_CLK_HSDMA>;
+ clock-names = "hsdma";
resets = <&rstctrl 5>;
reset-names = "hsdma";
@@ -311,11 +306,6 @@ rstctrl: rstctrl {
#reset-cells = <1>;
};
- clkctrl: clkctrl {
- compatible = "ralink,rt2880-clock";
- #clock-cells = <1>;
- };
-
sdhci: sdhci@1E130000 {
status = "disabled";
@@ -334,7 +324,8 @@ sdhci: sdhci@1E130000 {
pinctrl-0 = <&sdhci_pins>;
pinctrl-1 = <&sdhci_pins>;
- clocks = <&mmc_clock &mmc_clock>;
+ clocks = <&pll MT7621_CLK_SHXC>,
+ <&pll MT7621_CLK_50M>;
clock-names = "source", "hclk";
interrupt-parent = <&gic>;
@@ -349,7 +340,7 @@ xhci: xhci@1E1C0000 {
0x1e1d0700 0x0100>;
reg-names = "mac", "ippc";
- clocks = <&sysclock>;
+ clocks = <&pll MT7621_CLK_XTAL>;
clock-names = "sys_ck";
interrupt-parent = <&gic>;
@@ -368,7 +359,7 @@ gic: interrupt-controller@1fbc0000 {
timer {
compatible = "mti,gic-timer";
interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
- clocks = <&cpuclock>;
+ clocks = <&pll MT7621_CLK_CPU>;
};
};
@@ -381,6 +372,9 @@ nand: nand@1e003000 {
0x1e003800 0x800>;
#address-cells = <1>;
#size-cells = <1>;
+
+ clocks = <&pll MT7621_CLK_NAND>;
+ clock-names = "nand";
};
ethsys: syscon@1e000000 {
@@ -394,8 +388,9 @@ ethernet: ethernet@1e100000 {
compatible = "mediatek,mt7621-eth";
reg = <0x1e100000 0x10000>;
- clocks = <&sysclock>;
- clock-names = "ethif";
+ clocks = <&pll MT7621_CLK_FE>,
+ <&pll MT7621_CLK_ETH>;
+ clock-names = "fe", "ethif";
#address-cells = <1>;
#size-cells = <0>;
@@ -521,7 +516,9 @@ GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH
resets = <&rstctrl 24 &rstctrl 25 &rstctrl 26>;
reset-names = "pcie0", "pcie1", "pcie2";
- clocks = <&clkctrl 24 &clkctrl 25 &clkctrl 26>;
+ clocks = <&pll MT7621_CLK_PCIE0>,
+ <&pll MT7621_CLK_PCIE1>,
+ <&pll MT7621_CLK_PCIE2>;
clock-names = "pcie0", "pcie1", "pcie2";
phys = <&pcie0_phy 1>, <&pcie2_phy 0>;
phy-names = "pcie-phy0", "pcie-phy2";
--
2.25.1
Adds device tree binding documentation for clocks in the
MT7621 SOC.
Signed-off-by: Sergio Paracuellos <[email protected]>
---
.../bindings/clock/mediatek,mt7621-clk.yaml | 66 +++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
new file mode 100644
index 000000000000..842a0f2c9d40
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,mt7621-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MT7621 Clock Device Tree Bindings
+
+maintainers:
+ - Sergio Paracuellos <[email protected]>
+
+description: |
+ The MT7621 has a PLL controller from where the cpu clock is provided
+ as well as derived clocks for the bus and the peripherals. It also
+ can gate SoC device clocks.
+
+ Each clock is assigned an identifier and client nodes use this identifier
+ to specify the clock which they consume.
+
+ All these identifiers could be found in:
+ [1]: <include/dt-bindings/clock/mt7621-clk.h>.
+
+properties:
+ compatible:
+ const: mediatek,mt7621-clk
+
+ "#clock-cells":
+ description:
+ The first cell indicates the clock number, see [1] for available
+ clocks.
+ const: 1
+
+ ralink,sysctl:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description:
+ phandle of syscon used to control system registers
+
+ ralink,memctl:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description:
+ phandle of syscon used to control memory registers
+
+ clock-output-names:
+ maxItems: 8
+
+required:
+ - compatible
+ - '#clock-cells'
+ - ralink,sysctl
+ - ralink,memctl
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/mt7621-clk.h>
+
+ pll {
+ compatible = "mediatek,mt7621-clk";
+ #clock-cells = <1>;
+ ralink,sysctl = <&sysc>;
+ ralink,memctl = <&memc>;
+ clock-output-names = "xtal", "cpu", "bus",
+ "50m", "125m", "150m",
+ "250m", "270m";
+ };
--
2.25.1
Vendor listed for mediatek in kernel vendor file 'vendor-prefixes.yaml'
contains 'mediatek' as a valid vendor string. Some nodes in the device
tree are using an invalid vendor string vfor 'mtk' instead. Fix all of
them in dts file. Update also ralink mt7621 related code to properly
match new strings. Even there are used in the device tree there are
some strings that are not referred anywhere but have been also updated
with new vendor name. These are 'mtk,mt7621-wdt', 'mtk,mt7621-nand',
'mtk,mt7621-mc', and 'mtk,mt7621-cpc'.
Acked-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Sergio Paracuellos <[email protected]>
---
arch/mips/ralink/mt7621.c | 6 +++---
drivers/staging/mt7621-dts/mt7621.dtsi | 12 ++++++------
2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/arch/mips/ralink/mt7621.c b/arch/mips/ralink/mt7621.c
index ca0ac607b0f3..5d74fc1c96ac 100644
--- a/arch/mips/ralink/mt7621.c
+++ b/arch/mips/ralink/mt7621.c
@@ -112,8 +112,8 @@ phys_addr_t mips_cpc_default_phys_base(void)
void __init ralink_of_remap(void)
{
- rt_sysc_membase = plat_of_remap_node("mtk,mt7621-sysc");
- rt_memc_membase = plat_of_remap_node("mtk,mt7621-memc");
+ rt_sysc_membase = plat_of_remap_node("mediatek,mt7621-sysc");
+ rt_memc_membase = plat_of_remap_node("mediatek,mt7621-memc");
if (!rt_sysc_membase || !rt_memc_membase)
panic("Failed to remap core resources");
@@ -181,7 +181,7 @@ void prom_soc_init(struct ralink_soc_info *soc_info)
if (n0 == MT7621_CHIP_NAME0 && n1 == MT7621_CHIP_NAME1) {
name = "MT7621";
- soc_info->compatible = "mtk,mt7621-soc";
+ soc_info->compatible = "mediatek,mt7621-soc";
} else {
panic("mt7621: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
}
diff --git a/drivers/staging/mt7621-dts/mt7621.dtsi b/drivers/staging/mt7621-dts/mt7621.dtsi
index 11d1670d4339..55784dd48dc5 100644
--- a/drivers/staging/mt7621-dts/mt7621.dtsi
+++ b/drivers/staging/mt7621-dts/mt7621.dtsi
@@ -56,7 +56,7 @@ palmbus: palmbus@1E000000 {
#size-cells = <1>;
sysc: sysc@0 {
- compatible = "mtk,mt7621-sysc", "syscon";
+ compatible = "mediatek,mt7621-sysc", "syscon";
reg = <0x0 0x100>;
};
@@ -71,7 +71,7 @@ pll: pll {
};
wdt: wdt@100 {
- compatible = "mtk,mt7621-wdt";
+ compatible = "mediatek,mt7621-wdt";
reg = <0x100 0x100>;
};
@@ -128,17 +128,17 @@ i2s: i2s@a00 {
};
memc: memc@5000 {
- compatible = "mtk,mt7621-memc", "syscon";
+ compatible = "mediatek,mt7621-memc", "syscon";
reg = <0x5000 0x1000>;
};
cpc: cpc@1fbf0000 {
- compatible = "mtk,mt7621-cpc";
+ compatible = "mediatek,mt7621-cpc";
reg = <0x1fbf0000 0x8000>;
};
mc: mc@1fbf8000 {
- compatible = "mtk,mt7621-mc";
+ compatible = "mediatek,mt7621-mc";
reg = <0x1fbf8000 0x8000>;
};
@@ -366,7 +366,7 @@ timer {
nand: nand@1e003000 {
status = "disabled";
- compatible = "mtk,mt7621-nand";
+ compatible = "mediatek,mt7621-nand";
bank-width = <2>;
reg = <0x1e003000 0x800
0x1e003800 0x800>;
--
2.25.1
The documentation for this SOC only talks about two
registers regarding to the clocks:
* SYSC_REG_CPLL_CLKCFG0 - provides some information about
boostrapped refclock. PLL and dividers used for CPU and some
sort of BUS.
* SYSC_REG_CPLL_CLKCFG1 - a banch of gates to enable/disable
clocks for all or some ip cores.
Looking into driver code, and some openWRT patched there are
another frequencies which are used in some drivers (uart, sd...).
According to all of this information the clock plan for this
SoC is set as follows:
- Main top clock "xtal" from where all the rest of the world is
derived.
- CPU clock "cpu" derived from "xtal" frequencies and a bunch of
register reads and predividers.
- BUS clock "bus" derived from "cpu" and with (cpu / 4) MHz.
- Fixed clocks from "xtal":
* "50m": 50 MHz.
* "125m": 125 MHz.
* "150m": 150 MHz.
* "250m": 250 MHz.
* "270m": 270 MHz.
We also have a buch of gate clocks with their parents:
* "hsdma": "150m"
* "fe": "250m"
* "sp_divtx": "270m"
* "timer": "50m"
* "pcm": "270m"
* "pio": "50m"
* "gdma": "bus"
* "nand": "125m"
* "i2c": "50m"
* "i2s": "270m"
* "spi": "bus"
* "uart1": "50m"
* "uart2": "50m"
* "uart3": "50m"
* "eth": "50m"
* "pcie0": "125m"
* "pcie1": "125m"
* "pcie2": "125m"
* "crypto": "250m"
* "shxc": "50m"
With this information the clk driver will provide clock and gates
functionality from a a set of hardcoded clocks allowing to define
a nice device tree without fixed clocks.
Signed-off-by: Sergio Paracuellos <[email protected]>
---
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/ralink/Kconfig | 15 +
drivers/clk/ralink/Makefile | 2 +
drivers/clk/ralink/clk-mt7621.c | 536 ++++++++++++++++++++++++++++++++
5 files changed, 555 insertions(+)
create mode 100644 drivers/clk/ralink/Kconfig
create mode 100644 drivers/clk/ralink/Makefile
create mode 100644 drivers/clk/ralink/clk-mt7621.c
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 7c5dc348c16f..70b23da997bf 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -382,6 +382,7 @@ source "drivers/clk/mediatek/Kconfig"
source "drivers/clk/meson/Kconfig"
source "drivers/clk/mvebu/Kconfig"
source "drivers/clk/qcom/Kconfig"
+source "drivers/clk/ralink/Kconfig"
source "drivers/clk/renesas/Kconfig"
source "drivers/clk/rockchip/Kconfig"
source "drivers/clk/samsung/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 5325847469e9..1b35ad852721 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -98,6 +98,7 @@ obj-$(CONFIG_COMMON_CLK_NXP) += nxp/
obj-$(CONFIG_MACH_PISTACHIO) += pistachio/
obj-$(CONFIG_COMMON_CLK_PXA) += pxa/
obj-$(CONFIG_COMMON_CLK_QCOM) += qcom/
+obj-y += ralink/
obj-y += renesas/
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
obj-$(CONFIG_COMMON_CLK_SAMSUNG) += samsung/
diff --git a/drivers/clk/ralink/Kconfig b/drivers/clk/ralink/Kconfig
new file mode 100644
index 000000000000..3e3f5cb9ad88
--- /dev/null
+++ b/drivers/clk/ralink/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# MediaTek Mt7621 Clock Driver
+#
+menu "Clock driver for Mediatek mt7621 SoC"
+ depends on SOC_MT7621 || COMPILE_TEST
+
+config CLK_MT7621
+ bool "Clock driver for MediaTek MT7621"
+ depends on SOC_MT7621 || COMPILE_TEST
+ default SOC_MT7621
+ select MFD_SYSCON
+ help
+ This driver supports MediaTek MT7621 basic clocks.
+endmenu
diff --git a/drivers/clk/ralink/Makefile b/drivers/clk/ralink/Makefile
new file mode 100644
index 000000000000..cf6f9216379d
--- /dev/null
+++ b/drivers/clk/ralink/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_CLK_MT7621) += clk-mt7621.o
diff --git a/drivers/clk/ralink/clk-mt7621.c b/drivers/clk/ralink/clk-mt7621.c
new file mode 100644
index 000000000000..b32b19fd093e
--- /dev/null
+++ b/drivers/clk/ralink/clk-mt7621.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Mediatek MT7621 Clock Driver
+ * Author: Sergio Paracuellos <[email protected]>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <dt-bindings/clock/mt7621-clk.h>
+
+/* Configuration registers */
+#define SYSC_REG_SYSTEM_CONFIG0 0x10
+#define SYSC_REG_SYSTEM_CONFIG1 0x14
+#define SYSC_REG_CLKCFG0 0x2c
+#define SYSC_REG_CLKCFG1 0x30
+#define SYSC_REG_CUR_CLK_STS 0x44
+
+#define MEMC_REG_CPU_PLL 0x648
+#define XTAL_MODE_SEL_MASK 0x7
+#define XTAL_MODE_SEL_SHIFT 6
+
+#define CPU_CLK_SEL_MASK 0x3
+#define CPU_CLK_SEL_SHIFT 30
+
+#define CUR_CPU_FDIV_MASK 0x1f
+#define CUR_CPU_FDIV_SHIFT 8
+#define CUR_CPU_FFRAC_MASK 0x1f
+#define CUR_CPU_FFRAC_SHIFT 0
+
+#define CPU_PLL_PREDIV_MASK 0x3
+#define CPU_PLL_PREDIV_SHIFT 12
+#define CPU_PLL_FBDIV_MASK 0x7f
+#define CPU_PLL_FBDIV_SHIFT 4
+
+struct mt7621_clk_priv {
+ struct regmap *sysc;
+ struct regmap *memc;
+};
+
+struct mt7621_clk {
+ struct clk_hw hw;
+ struct mt7621_clk_priv *priv;
+};
+
+struct mt7621_fixed_clk {
+ u8 idx;
+ const char *name;
+ const char *parent_name;
+ unsigned long rate;
+ struct clk_hw *hw;
+};
+
+struct mt7621_gate {
+ u8 idx;
+ const char *name;
+ const char *parent_name;
+ struct mt7621_clk_priv *priv;
+ u32 bit_idx;
+ struct clk_hw hw;
+};
+
+#define GATE(_id, _name, _pname, _shift) \
+ { \
+ .idx = _id, \
+ .name = _name, \
+ .parent_name = _pname, \
+ .bit_idx = _shift \
+ }
+
+static struct mt7621_gate mt7621_gates[] = {
+ GATE(MT7621_CLK_HSDMA, "hsdma", "150m", BIT(5)),
+ GATE(MT7621_CLK_FE, "fe", "250m", BIT(6)),
+ GATE(MT7621_CLK_SP_DIVTX, "sp_divtx", "270m", BIT(7)),
+ GATE(MT7621_CLK_TIMER, "timer", "50m", BIT(8)),
+ GATE(MT7621_CLK_PCM, "pcm", "270m", BIT(11)),
+ GATE(MT7621_CLK_PIO, "pio", "50m", BIT(13)),
+ GATE(MT7621_CLK_GDMA, "gdma", "bus", BIT(14)),
+ GATE(MT7621_CLK_NAND, "nand", "125m", BIT(15)),
+ GATE(MT7621_CLK_I2C, "i2c", "50m", BIT(16)),
+ GATE(MT7621_CLK_I2S, "i2s", "270m", BIT(17)),
+ GATE(MT7621_CLK_SPI, "spi", "bus", BIT(18)),
+ GATE(MT7621_CLK_UART1, "uart1", "50m", BIT(19)),
+ GATE(MT7621_CLK_UART2, "uart2", "50m", BIT(20)),
+ GATE(MT7621_CLK_UART3, "uart3", "50m", BIT(21)),
+ GATE(MT7621_CLK_ETH, "eth", "50m", BIT(23)),
+ GATE(MT7621_CLK_PCIE0, "pcie0", "125m", BIT(24)),
+ GATE(MT7621_CLK_PCIE1, "pcie1", "125m", BIT(25)),
+ GATE(MT7621_CLK_PCIE2, "pcie2", "125m", BIT(26)),
+ GATE(MT7621_CLK_CRYPTO, "crypto", "250m", BIT(29)),
+ GATE(MT7621_CLK_SHXC, "shxc", "50m", BIT(30))
+};
+
+static inline struct mt7621_gate *to_mt7621_gate(struct clk_hw *hw)
+{
+ return container_of(hw, struct mt7621_gate, hw);
+}
+
+static int mt7621_gate_enable(struct clk_hw *hw)
+{
+ struct mt7621_gate *clk_gate = to_mt7621_gate(hw);
+ struct regmap *sysc = clk_gate->priv->sysc;
+
+ return regmap_update_bits(sysc, SYSC_REG_CLKCFG1,
+ clk_gate->bit_idx, clk_gate->bit_idx);
+}
+
+static void mt7621_gate_disable(struct clk_hw *hw)
+{
+ struct mt7621_gate *clk_gate = to_mt7621_gate(hw);
+ struct regmap *sysc = clk_gate->priv->sysc;
+
+ regmap_update_bits(sysc, SYSC_REG_CLKCFG1, clk_gate->bit_idx, 0);
+}
+
+static int mt7621_gate_is_enabled(struct clk_hw *hw)
+{
+ struct mt7621_gate *clk_gate = to_mt7621_gate(hw);
+ struct regmap *sysc = clk_gate->priv->sysc;
+ u32 val;
+
+ if (regmap_read(sysc, SYSC_REG_CLKCFG1, &val))
+ return 0;
+
+ return val & BIT(clk_gate->bit_idx);
+}
+
+static const struct clk_ops mt7621_gate_ops = {
+ .enable = mt7621_gate_enable,
+ .disable = mt7621_gate_disable,
+ .is_enabled = mt7621_gate_is_enabled,
+};
+
+static int mt7621_gate_ops_init(struct device *dev,
+ struct mt7621_gate *sclk)
+{
+ struct clk_init_data init = {
+ .flags = CLK_SET_RATE_PARENT,
+ .num_parents = 1,
+ .parent_names = &sclk->parent_name,
+ .ops = &mt7621_gate_ops,
+ .name = sclk->name,
+ };
+
+ sclk->hw.init = &init;
+ return devm_clk_hw_register(dev, &sclk->hw);
+}
+
+static int mt7621_register_gates(struct device *dev,
+ struct clk_hw_onecell_data *clk_data,
+ struct mt7621_clk_priv *priv)
+{
+ struct clk_hw **hws = clk_data->hws;
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(mt7621_gates); i++) {
+ struct mt7621_gate *sclk = &mt7621_gates[i];
+
+ sclk->priv = priv;
+ ret = mt7621_gate_ops_init(dev, sclk);
+ if (ret) {
+ dev_err(dev, "Couldn't register clock %s\n", sclk->name);
+ goto err_clk_unreg;
+ }
+
+ hws[sclk->idx] = &sclk->hw;
+ }
+
+ return 0;
+
+err_clk_unreg:
+ while (--i >= 0) {
+ struct mt7621_gate *sclk = &mt7621_gates[i];
+
+ clk_hw_unregister(&sclk->hw);
+ }
+ return ret;
+}
+
+#define FIXED(_id, _name, _rate) \
+ { \
+ .idx = _id, \
+ .name = _name, \
+ .parent_name = "xtal", \
+ .rate = _rate \
+ }
+
+static struct mt7621_fixed_clk mt7621_fixed_clks[] = {
+ FIXED(MT7621_CLK_50M, "50m", 50000000),
+ FIXED(MT7621_CLK_125M, "125m", 125000000),
+ FIXED(MT7621_CLK_150M, "150m", 150000000),
+ FIXED(MT7621_CLK_250M, "250m", 250000000),
+ FIXED(MT7621_CLK_270M, "270m", 270000000),
+};
+
+static int mt7621_register_fixed_clocks(struct device *dev,
+ struct clk_hw_onecell_data *clk_data)
+{
+ struct clk_hw **hws = clk_data->hws;
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(mt7621_fixed_clks); i++) {
+ struct mt7621_fixed_clk *sclk = &mt7621_fixed_clks[i];
+
+ sclk->hw = clk_hw_register_fixed_rate(dev, sclk->name,
+ sclk->parent_name, 0,
+ sclk->rate);
+ if (IS_ERR(sclk->hw)) {
+ dev_err(dev, "Couldn't register clock %s\n", sclk->name);
+ ret = PTR_ERR(sclk->hw);
+ goto err_clk_unreg;
+ }
+
+ hws[sclk->idx] = sclk->hw;
+ }
+
+ return 0;
+
+err_clk_unreg:
+ while (--i >= 0) {
+ struct mt7621_fixed_clk *sclk = &mt7621_fixed_clks[i];
+
+ clk_hw_unregister_fixed_rate(sclk->hw);
+ }
+ return ret;
+}
+
+static inline struct mt7621_clk *to_mt7621_clk(struct clk_hw *hw)
+{
+ return container_of(hw, struct mt7621_clk, hw);
+}
+
+static unsigned long mt7621_xtal_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct mt7621_clk *clk = to_mt7621_clk(hw);
+ struct regmap *sysc = clk->priv->sysc;
+ u32 val;
+
+ regmap_read(sysc, SYSC_REG_SYSTEM_CONFIG0, &val);
+ val = (val >> XTAL_MODE_SEL_SHIFT) & XTAL_MODE_SEL_MASK;
+
+ if (val <= 2)
+ return 20000000;
+ if (val <= 5)
+ return 40000000;
+
+ return 25000000;
+}
+
+static unsigned long mt7621_cpu_recalc_rate(struct clk_hw *hw,
+ unsigned long xtal_clk)
+{
+ static const u32 prediv_tbl[] = { 0, 1, 2, 2 };
+ struct mt7621_clk *clk = to_mt7621_clk(hw);
+ struct regmap *sysc = clk->priv->sysc;
+ struct regmap *memc = clk->priv->memc;
+ u32 clkcfg, clk_sel, curclk, ffiv, ffrac;
+ u32 pll, prediv, fbdiv;
+ unsigned long cpu_clk;
+
+ regmap_read(sysc, SYSC_REG_CLKCFG0, &clkcfg);
+ clk_sel = (clkcfg >> CPU_CLK_SEL_SHIFT) & CPU_CLK_SEL_MASK;
+
+ regmap_read(sysc, SYSC_REG_CUR_CLK_STS, &curclk);
+ ffiv = (curclk >> CUR_CPU_FDIV_SHIFT) & CUR_CPU_FDIV_MASK;
+ ffrac = (curclk >> CUR_CPU_FFRAC_SHIFT) & CUR_CPU_FFRAC_MASK;
+
+ switch (clk_sel) {
+ case 0:
+ cpu_clk = 500000000;
+ break;
+ case 1:
+ regmap_read(memc, MEMC_REG_CPU_PLL, &pll);
+ fbdiv = (pll >> CPU_PLL_FBDIV_SHIFT) & CPU_PLL_FBDIV_MASK;
+ prediv = (pll >> CPU_PLL_PREDIV_SHIFT) & CPU_PLL_PREDIV_MASK;
+ cpu_clk = ((fbdiv + 1) * xtal_clk) >> prediv_tbl[prediv];
+ break;
+ default:
+ cpu_clk = xtal_clk;
+ }
+
+ return cpu_clk / ffiv * ffrac;
+}
+
+static unsigned long mt7621_bus_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ return parent_rate / 4;
+}
+
+#define CLK_BASE(_name, _parent, _recalc) { \
+ .init = &(struct clk_init_data) { \
+ .name = _name, \
+ .ops = &(const struct clk_ops) { \
+ .recalc_rate = _recalc, \
+ }, \
+ .parent_data = &(const struct clk_parent_data) { \
+ .name = _parent, \
+ .fw_name = _parent \
+ }, \
+ .num_parents = _parent ? 1 : 0 \
+ }, \
+}
+
+static struct mt7621_clk mt7621_clks_base[] = {
+ { CLK_BASE("xtal", NULL, mt7621_xtal_recalc_rate) },
+ { CLK_BASE("cpu", "xtal", mt7621_cpu_recalc_rate) },
+ { CLK_BASE("bus", "cpu", mt7621_bus_recalc_rate) },
+};
+
+static struct clk_hw *mt7621_clk_early[MT7621_CLK_MAX];
+
+static int mt7621_register_early_clocks(struct device_node *np,
+ struct clk_hw_onecell_data *clk_data,
+ struct mt7621_clk_priv *priv)
+{
+ struct clk_hw **hws = clk_data->hws;
+ int ret, i, j;
+
+ for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) {
+ struct mt7621_clk *sclk = &mt7621_clks_base[i];
+
+ sclk->priv = priv;
+ ret = of_clk_hw_register(np, &sclk->hw);
+ if (ret) {
+ pr_err("Couldn't register top clock %i\n", i);
+ goto err_clk_unreg;
+ }
+
+ hws[i] = &sclk->hw;
+ mt7621_clk_early[i] = &sclk->hw;
+ }
+
+ for (j = i; j < MT7621_CLK_MAX; j++)
+ mt7621_clk_early[j] = ERR_PTR(-EPROBE_DEFER);
+
+ return 0;
+
+err_clk_unreg:
+ while (--i >= 0) {
+ struct mt7621_clk *sclk = &mt7621_clks_base[i];
+
+ clk_hw_unregister(&sclk->hw);
+ }
+ return ret;
+}
+
+static int mt7621_prepare_enable_clocks(struct clk_hw_onecell_data *clk_data)
+{
+ int ret, i;
+
+ for (i = 0; i < MT7621_CLK_MAX; i++) {
+ ret = clk_prepare_enable(clk_data->hws[i]->clk);
+ if (ret) {
+ pr_err("failed to enable clk: %d\n", ret);
+ goto err_clk_disable;
+ }
+ }
+
+ return 0;
+
+err_clk_disable:
+ while (--i >= 0)
+ clk_disable_unprepare(clk_data->hws[i]->clk);
+ return ret;
+}
+
+static void __init mt7621_clk_init(struct device_node *node)
+{
+ struct mt7621_clk_priv *priv;
+ struct clk_hw_onecell_data *clk_data;
+ int ret, i, count;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return;
+
+ priv->sysc = syscon_regmap_lookup_by_phandle(node, "ralink,sysctl");
+ if (IS_ERR(priv->sysc)) {
+ pr_err("Could not get sysc syscon regmap\n");
+ goto free_clk_priv;
+ }
+
+ priv->memc = syscon_regmap_lookup_by_phandle(node, "ralink,memctl");
+ if (IS_ERR(priv->memc)) {
+ pr_err("Could not get memc syscon regmap\n");
+ goto free_clk_priv;
+ }
+
+ count = ARRAY_SIZE(mt7621_clks_base) +
+ ARRAY_SIZE(mt7621_fixed_clks) + ARRAY_SIZE(mt7621_gates);
+ clk_data = kzalloc(struct_size(clk_data, hws, count), GFP_KERNEL);
+ if (!clk_data)
+ goto free_clk_priv;
+
+ ret = mt7621_register_early_clocks(node, clk_data, priv);
+ if (ret) {
+ pr_err("Couldn't register top clocks\n");
+ goto free_clk_data;
+ }
+
+ clk_data->num = count;
+
+ ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
+ if (ret) {
+ pr_err("Couldn't add clk hw provider\n");
+ goto unreg_clk_top;
+ }
+
+ return;
+
+unreg_clk_top:
+ for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) {
+ struct mt7621_clk *sclk = &mt7621_clks_base[i];
+
+ clk_hw_unregister(&sclk->hw);
+ }
+
+free_clk_data:
+ kfree(clk_data);
+
+free_clk_priv:
+ kfree(priv);
+}
+CLK_OF_DECLARE_DRIVER(mt7621_clk, "mediatek,mt7621-clk", mt7621_clk_init);
+
+static int mt7621_clk_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct clk_hw_onecell_data *clk_data;
+ struct device *dev = &pdev->dev;
+ struct mt7621_clk_priv *priv;
+ int ret, i, count;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->sysc = syscon_regmap_lookup_by_phandle(np, "ralink,sysctl");
+ if (IS_ERR(priv->sysc)) {
+ ret = PTR_ERR(priv->sysc);
+ dev_err(dev, "Could not get sysc syscon regmap\n");
+ goto free_clk_priv;
+ }
+
+ priv->memc = syscon_regmap_lookup_by_phandle(np, "ralink,memctl");
+ if (IS_ERR(priv->memc)) {
+ ret = PTR_ERR(priv->memc);
+ dev_err(dev, "Could not get memc syscon regmap\n");
+ goto free_clk_priv;
+ }
+
+ count = ARRAY_SIZE(mt7621_clks_base) +
+ ARRAY_SIZE(mt7621_fixed_clks) + ARRAY_SIZE(mt7621_gates);
+ clk_data = kzalloc(struct_size(clk_data, hws, count), GFP_KERNEL);
+ if (!clk_data) {
+ ret = -ENOMEM;
+ goto free_clk_priv;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++)
+ clk_data->hws[i] = mt7621_clk_early[i];
+
+ ret = mt7621_register_fixed_clocks(dev, clk_data);
+ if (ret) {
+ dev_err(dev, "Couldn't register fixed clocks\n");
+ goto free_clk_data;
+ }
+
+ ret = mt7621_register_gates(dev, clk_data, priv);
+ if (ret) {
+ dev_err(dev, "Couldn't register fixed clock gates\n");
+ goto unreg_clk_fixed;
+ }
+
+ clk_data->num = count;
+
+ ret = mt7621_prepare_enable_clocks(clk_data);
+ if (ret) {
+ dev_err(dev, "Couldn't register fixed clock gates\n");
+ goto unreg_clk_gates;
+ }
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
+ if (ret) {
+ dev_err(dev, "Couldn't add clk hw provider\n");
+ goto disable_clks;
+ }
+
+ return 0;
+
+disable_clks:
+ for (i = 0; i < MT7621_CLK_MAX; i++)
+ clk_disable_unprepare(clk_data->hws[i]->clk);
+
+unreg_clk_gates:
+ for (i = 0; i < ARRAY_SIZE(mt7621_gates); i++) {
+ struct mt7621_gate *sclk = &mt7621_gates[i];
+
+ clk_hw_unregister(&sclk->hw);
+ }
+
+unreg_clk_fixed:
+ for (i = 0; i < ARRAY_SIZE(mt7621_fixed_clks); i++) {
+ struct mt7621_fixed_clk *sclk = &mt7621_fixed_clks[i];
+
+ clk_hw_unregister_fixed_rate(sclk->hw);
+ }
+
+free_clk_data:
+ kfree(clk_data);
+
+free_clk_priv:
+ kfree(priv);
+
+ return ret;
+}
+
+static const struct of_device_id mt7621_clk_of_match[] = {
+ { .compatible = "mediatek,mt7621-clk" },
+ {},
+};
+
+static struct platform_driver mt7621_clk_driver = {
+ .probe = mt7621_clk_probe,
+ .driver = {
+ .name = "mt7621-clk",
+ .of_match_table = mt7621_clk_of_match,
+ },
+};
+builtin_platform_driver(mt7621_clk_driver);
--
2.25.1
Adding myself as maintainer for mt7621 clock driver.
Signed-off-by: Sergio Paracuellos <[email protected]>
---
MAINTAINERS | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 809a68af5efd..be5ada6b4309 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11288,6 +11288,12 @@ L: [email protected]
S: Maintained
F: drivers/net/wireless/mediatek/mt7601u/
+MEDIATEK MT7621 CLOCK DRIVER
+M: Sergio Paracuellos <[email protected]>
+S: Maintained
+F: Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
+F: drivers/clk/ralink/clk-mt7621.c
+
MEDIATEK MT7621/28/88 I2C DRIVER
M: Stefan Roese <[email protected]>
L: [email protected]
--
2.25.1
On Thu, Feb 18, 2021 at 08:07:05AM +0100, Sergio Paracuellos wrote:
> Adds device tree binding documentation for clocks in the
> MT7621 SOC.
>
> Signed-off-by: Sergio Paracuellos <[email protected]>
> ---
> .../bindings/clock/mediatek,mt7621-clk.yaml | 66 +++++++++++++++++++
> 1 file changed, 66 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
>
> diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
> new file mode 100644
> index 000000000000..842a0f2c9d40
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/mediatek,mt7621-clk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MT7621 Clock Device Tree Bindings
> +
> +maintainers:
> + - Sergio Paracuellos <[email protected]>
> +
> +description: |
> + The MT7621 has a PLL controller from where the cpu clock is provided
> + as well as derived clocks for the bus and the peripherals. It also
> + can gate SoC device clocks.
> +
> + Each clock is assigned an identifier and client nodes use this identifier
> + to specify the clock which they consume.
> +
> + All these identifiers could be found in:
> + [1]: <include/dt-bindings/clock/mt7621-clk.h>.
> +
> +properties:
> + compatible:
> + const: mediatek,mt7621-clk
> +
> + "#clock-cells":
> + description:
> + The first cell indicates the clock number, see [1] for available
> + clocks.
> + const: 1
> +
> + ralink,sysctl:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description:
> + phandle of syscon used to control system registers
> +
> + ralink,memctl:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description:
> + phandle of syscon used to control memory registers
I assume one of these phandles are the main registers for the clocks?
Make this a child node and drop that phandle.
> +
> + clock-output-names:
> + maxItems: 8
> +
> +required:
> + - compatible
> + - '#clock-cells'
> + - ralink,sysctl
> + - ralink,memctl
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/mt7621-clk.h>
> +
> + pll {
> + compatible = "mediatek,mt7621-clk";
> + #clock-cells = <1>;
> + ralink,sysctl = <&sysc>;
> + ralink,memctl = <&memc>;
> + clock-output-names = "xtal", "cpu", "bus",
> + "50m", "125m", "150m",
> + "250m", "270m";
> + };
> --
> 2.25.1
>
Hi Rob!
On Sat, Mar 6, 2021 at 6:48 AM Rob Herring <[email protected]> wrote:
>
> On Thu, Feb 18, 2021 at 08:07:05AM +0100, Sergio Paracuellos wrote:
> > Adds device tree binding documentation for clocks in the
> > MT7621 SOC.
> >
> > Signed-off-by: Sergio Paracuellos <[email protected]>
> > ---
> > .../bindings/clock/mediatek,mt7621-clk.yaml | 66 +++++++++++++++++++
> > 1 file changed, 66 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
> > new file mode 100644
> > index 000000000000..842a0f2c9d40
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/mediatek,mt7621-clk.yaml
> > @@ -0,0 +1,66 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/mediatek,mt7621-clk.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MT7621 Clock Device Tree Bindings
> > +
> > +maintainers:
> > + - Sergio Paracuellos <[email protected]>
> > +
> > +description: |
> > + The MT7621 has a PLL controller from where the cpu clock is provided
> > + as well as derived clocks for the bus and the peripherals. It also
> > + can gate SoC device clocks.
> > +
> > + Each clock is assigned an identifier and client nodes use this identifier
> > + to specify the clock which they consume.
> > +
> > + All these identifiers could be found in:
> > + [1]: <include/dt-bindings/clock/mt7621-clk.h>.
> > +
> > +properties:
> > + compatible:
> > + const: mediatek,mt7621-clk
> > +
> > + "#clock-cells":
> > + description:
> > + The first cell indicates the clock number, see [1] for available
> > + clocks.
> > + const: 1
> > +
> > + ralink,sysctl:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description:
> > + phandle of syscon used to control system registers
> > +
> > + ralink,memctl:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description:
> > + phandle of syscon used to control memory registers
>
> I assume one of these phandles are the main registers for the clocks?
> Make this a child node and drop that phandle.
On MT7621, CPU clock can be chosen from 3 sources: crystal clock,
a fixed 500MHz clock or a clock created by the memory controller.
sysctl contains a bootstrap register to determine crystal clock, a
clock mux for choosing between the 3 sources for CPU clock, and
a clock gate register for various peripherals. The ralink,memctl
phandle here is to read the cpu clock frequency from the memory
controller.
The original implementation hides this hardware detail to avoid
splitting the driver into three just for the CPU clock.
Is this approach okay and we can put it under sysctl node,
or this driver needs to be further splitted?
--
Regards,
Chuanhong Guo
Hi Rob,
On Fri, Mar 5, 2021 at 11:47 PM Rob Herring <[email protected]> wrote:
[snip]
> > +
> > + ralink,sysctl:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description:
> > + phandle of syscon used to control system registers
> > +
> > + ralink,memctl:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description:
> > + phandle of syscon used to control memory registers
>
> I assume one of these phandles are the main registers for the clocks?
> Make this a child node and drop that phandle.
The 'ralink,sysctl' phandle is to read bootstrap register to be able
to derive xtal and a clk gate register for the peripherals.
The 'ralink,memctl' phandle is to read the cpu clock frequency from
the memory controller.
So there is not "main registers". I already put this as a child node
in v4 and I was told to get rid of child nodes. I need this as a
regmap to other DT node registers (sysctl, and memctl) to be able to
use the driver without specific architecture operations and properly
enable for COMPILE_TEST without dirty Makefile arch flags. Both sysctl
and memctl has no other child nodes, and I think that's why I was told
to avoid child nodes at the end. I explained here [0] current sysctl
and memctl in the mt7621 device tree and my view of the need for this
two syscons:
[0]: https://lkml.org/lkml/2021/1/2/9
So to avoid to send again "a previous version" on this patch, please
guide me in the correct thing to do. Stephen, Rob, I will be really
happy with your help :)
Best regards,
Sergio Paracuellos
>
> > +
> > + clock-output-names:
> > + maxItems: 8
> > +
> > +required:
> > + - compatible
> > + - '#clock-cells'
> > + - ralink,sysctl
> > + - ralink,memctl
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/mt7621-clk.h>
> > +
> > + pll {
> > + compatible = "mediatek,mt7621-clk";
> > + #clock-cells = <1>;
> > + ralink,sysctl = <&sysc>;
> > + ralink,memctl = <&memc>;
> > + clock-output-names = "xtal", "cpu", "bus",
> > + "50m", "125m", "150m",
> > + "250m", "270m";
> > + };
> > --
> > 2.25.1
> >
Hi again,
On Sat, Mar 6, 2021 at 8:12 AM Sergio Paracuellos
<[email protected]> wrote:
>
> Hi Rob,
>
> On Fri, Mar 5, 2021 at 11:47 PM Rob Herring <[email protected]> wrote:
> [snip]
> > > +
> > > + ralink,sysctl:
> > > + $ref: /schemas/types.yaml#/definitions/phandle
> > > + description:
> > > + phandle of syscon used to control system registers
> > > +
> > > + ralink,memctl:
> > > + $ref: /schemas/types.yaml#/definitions/phandle
> > > + description:
> > > + phandle of syscon used to control memory registers
> >
> > I assume one of these phandles are the main registers for the clocks?
> > Make this a child node and drop that phandle.
>
> The 'ralink,sysctl' phandle is to read bootstrap register to be able
> to derive xtal and a clk gate register for the peripherals.
> The 'ralink,memctl' phandle is to read the cpu clock frequency from
> the memory controller.
>
> So there is not "main registers". I already put this as a child node
> in v4 and I was told to get rid of child nodes. I need this as a
> regmap to other DT node registers (sysctl, and memctl) to be able to
> use the driver without specific architecture operations and properly
> enable for COMPILE_TEST without dirty Makefile arch flags. Both sysctl
> and memctl has no other child nodes, and I think that's why I was told
> to avoid child nodes at the end. I explained here [0] current sysctl
> and memctl in the mt7621 device tree and my view of the need for this
> two syscons:
>
> [0]: https://lkml.org/lkml/2021/1/2/9
>
> So to avoid to send again "a previous version" on this patch, please
> guide me in the correct thing to do. Stephen, Rob, I will be really
> happy with your help :)
Since there are no other child nodes for this sysc, should merge clock
properties
with this node in the following way a valid approach:
sysc: sysc@0 {
compatible = "mediatek,mt7621-sysc", "syscon";
reg = <0x0 0x100>;
#clock-cells = <1>;
ralink,memctl = <&memc>;
clock-output-names = "xtal", "cpu", "bus",
"50m", "125m", "150m",
"250m", "270m";
};
Consumer clock:
node: node@0 {
...
clocks = <&sysc MT7621_CLK_WHATEVER>;
...
};
If that is the case... and since 'sysc' is used as system control
registers for all the rest of the world, where should be the yaml file
with bindings placed?
Thanks in advance again for your help.
Best regards,
Sergio Paracuellos
>
> Best regards,
> Sergio Paracuellos
> >
> > > +
> > > + clock-output-names:
> > > + maxItems: 8
> > > +
> > > +required:
> > > + - compatible
> > > + - '#clock-cells'
> > > + - ralink,sysctl
> > > + - ralink,memctl
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > + - |
> > > + #include <dt-bindings/clock/mt7621-clk.h>
> > > +
> > > + pll {
> > > + compatible = "mediatek,mt7621-clk";
> > > + #clock-cells = <1>;
> > > + ralink,sysctl = <&sysc>;
> > > + ralink,memctl = <&memc>;
> > > + clock-output-names = "xtal", "cpu", "bus",
> > > + "50m", "125m", "150m",
> > > + "250m", "270m";
> > > + };
> > > --
> > > 2.25.1
> > >
Hi,
On Sat, Mar 6, 2021 at 10:54 AM Sergio Paracuellos
<[email protected]> wrote:
>
> Hi again,
>
> On Sat, Mar 6, 2021 at 8:12 AM Sergio Paracuellos
> <[email protected]> wrote:
> >
> > Hi Rob,
> >
> > On Fri, Mar 5, 2021 at 11:47 PM Rob Herring <[email protected]> wrote:
> > [snip]
> > > > +
> > > > + ralink,sysctl:
> > > > + $ref: /schemas/types.yaml#/definitions/phandle
> > > > + description:
> > > > + phandle of syscon used to control system registers
> > > > +
> > > > + ralink,memctl:
> > > > + $ref: /schemas/types.yaml#/definitions/phandle
> > > > + description:
> > > > + phandle of syscon used to control memory registers
> > >
> > > I assume one of these phandles are the main registers for the clocks?
> > > Make this a child node and drop that phandle.
> >
> > The 'ralink,sysctl' phandle is to read bootstrap register to be able
> > to derive xtal and a clk gate register for the peripherals.
> > The 'ralink,memctl' phandle is to read the cpu clock frequency from
> > the memory controller.
> >
> > So there is not "main registers". I already put this as a child node
> > in v4 and I was told to get rid of child nodes. I need this as a
> > regmap to other DT node registers (sysctl, and memctl) to be able to
> > use the driver without specific architecture operations and properly
> > enable for COMPILE_TEST without dirty Makefile arch flags. Both sysctl
> > and memctl has no other child nodes, and I think that's why I was told
> > to avoid child nodes at the end. I explained here [0] current sysctl
> > and memctl in the mt7621 device tree and my view of the need for this
> > two syscons:
> >
> > [0]: https://lkml.org/lkml/2021/1/2/9
> >
> > So to avoid to send again "a previous version" on this patch, please
> > guide me in the correct thing to do. Stephen, Rob, I will be really
> > happy with your help :)
>
> Since there are no other child nodes for this sysc, should merge clock
> properties
> with this node in the following way a valid approach:
>
> sysc: sysc@0 {
> compatible = "mediatek,mt7621-sysc", "syscon";
> reg = <0x0 0x100>;
> #clock-cells = <1>;
> ralink,memctl = <&memc>;
> clock-output-names = "xtal", "cpu", "bus",
> "50m", "125m", "150m",
> "250m", "270m";
> };
>
> Consumer clock:
>
> node: node@0 {
> ...
> clocks = <&sysc MT7621_CLK_WHATEVER>;
> ...
> };
I have been reviewing bindings review comments along the time and I
was already suggested to do this I am saying here (see [0]) but my
mind seems that filtered it for any reason I don't really understand.
Maybe I should sleep a bit more :).
I will send v10 with these changes that hopefully will be the correct ones.
Thanks and sorry for bothering you with already suggested things.
Best regards,
Sergio Paracuellos
[0]: https://lkml.org/lkml/2020/12/31/206
>
> If that is the case... and since 'sysc' is used as system control
> registers for all the rest of the world, where should be the yaml file
> with bindings placed?
>
> Thanks in advance again for your help.
>
> Best regards,
> Sergio Paracuellos
>
> >
> > Best regards,
> > Sergio Paracuellos
> > >
> > > > +
> > > > + clock-output-names:
> > > > + maxItems: 8
> > > > +
> > > > +required:
> > > > + - compatible
> > > > + - '#clock-cells'
> > > > + - ralink,sysctl
> > > > + - ralink,memctl
> > > > +
> > > > +additionalProperties: false
> > > > +
> > > > +examples:
> > > > + - |
> > > > + #include <dt-bindings/clock/mt7621-clk.h>
> > > > +
> > > > + pll {
> > > > + compatible = "mediatek,mt7621-clk";
> > > > + #clock-cells = <1>;
> > > > + ralink,sysctl = <&sysc>;
> > > > + ralink,memctl = <&memc>;
> > > > + clock-output-names = "xtal", "cpu", "bus",
> > > > + "50m", "125m", "150m",
> > > > + "250m", "270m";
> > > > + };
> > > > --
> > > > 2.25.1
> > > >