From: Lucas Stach <[email protected]>
This adds the devicetree binding for the Tegra 2 NAND flash
controller.
Signed-off-by: Lucas Stach <[email protected]>
Signed-off-by: Stefan Agner <[email protected]>
---
.../bindings/mtd/nvidia,tegra20-nand.txt | 62 +++++++++++++++++++
1 file changed, 62 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
diff --git a/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
new file mode 100644
index 000000000000..49e472af1b39
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
@@ -0,0 +1,62 @@
+NVIDIA Tegra NAND Flash controller
+
+Required properties:
+- compatible: Must be one of:
+ - "nvidia,tegra20-nand"
+- reg: MMIO address range
+- interrupts: interrupt output of the NFC controller
+- clocks: Must contain an entry for each entry in clock-names.
+ See ../clocks/clock-bindings.txt for details.
+- clock-names: Must include the following entries:
+ - nand
+- resets: Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+ - nand
+
+Optional children nodes:
+Individual NAND chips are children of the NAND controller node. Currently
+only one NAND chip supported.
+
+Required children node properties:
+- reg: An integer ranging from 1 to 6 representing the CS line to use.
+
+Optional children node properties:
+- nand-ecc-mode: String, operation mode of the NAND ecc mode. "hw" by default
+- nand-ecc-algo: string, algorithm of NAND ECC.
+ Supported values are: "rs", "bch".
+- nand-bus-width : 8 or 16 bus width if not present 8
+- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
+- nand-ecc-strength: integer representing the number of bits to correct
+ per ECC step. Supported strength using HW ECC modes are:
+ - RS: 4, 6, 8
+ - BCH: 4, 8, 14, 16
+- nand-ecc-step-size: integer representing the number of data bytes
+ that are covered by a single ECC step. Must be 512.
+- wp-gpios: GPIO specifier for the write protect pin.
+
+Optional child node of NAND chip nodes:
+Partitions: see partition.txt
+
+ Example:
+ nand@70008000 {
+ compatible = "nvidia,tegra20-nand";
+ reg = <0x70008000 0x100>;
+ interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA20_CLK_NDFLASH>;
+ clock-names = "nand";
+ resets = <&tegra_car 13>;
+ reset-names = "nand";
+
+ nand-chip@0 {
+ reg = <0>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ nand-bus-width = <8>;
+ nand-on-flash-bbt;
+ nand-ecc-algo = "bch";
+ nand-ecc-step-size = <512>;
+ nand-ecc-strength = <8>;
+ wp-gpios = <&gpio TEGRA_GPIO(S, 0) GPIO_ACTIVE_LOW>;
+ };
+ };
--
2.17.0
Hi Stefan,
On Sun, 27 May 2018 23:54:38 +0200, Stefan Agner <[email protected]>
wrote:
> From: Lucas Stach <[email protected]>
>
> This adds the devicetree binding for the Tegra 2 NAND flash
> controller.
>
> Signed-off-by: Lucas Stach <[email protected]>
> Signed-off-by: Stefan Agner <[email protected]>
> ---
> .../bindings/mtd/nvidia,tegra20-nand.txt | 62 +++++++++++++++++++
> 1 file changed, 62 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
>
> diff --git a/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> new file mode 100644
> index 000000000000..49e472af1b39
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> @@ -0,0 +1,62 @@
> +NVIDIA Tegra NAND Flash controller
> +
> +Required properties:
> +- compatible: Must be one of:
Nitpick: just put the compatible here as there is only one?
> + - "nvidia,tegra20-nand"
> +- reg: MMIO address range
> +- interrupts: interrupt output of the NFC controller
> +- clocks: Must contain an entry for each entry in clock-names.
> + See ../clocks/clock-bindings.txt for details.
> +- clock-names: Must include the following entries:
> + - nand
> +- resets: Must contain an entry for each entry in reset-names.
> + See ../reset/reset.txt for details.
> +- reset-names: Must include the following entries:
> + - nand
> +
> +Optional children nodes:
> +Individual NAND chips are children of the NAND controller node. Currently
> +only one NAND chip supported.
> +
> +Required children node properties:
> +- reg: An integer ranging from 1 to 6 representing the CS line to use.
From 1? It usually starts at 0.
> +
> +Optional children node properties:
> +- nand-ecc-mode: String, operation mode of the NAND ecc mode. "hw" by default
> +- nand-ecc-algo: string, algorithm of NAND ECC.
> + Supported values are: "rs", "bch".
> +- nand-bus-width : 8 or 16 bus width if not present 8
> +- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
> +- nand-ecc-strength: integer representing the number of bits to correct
> + per ECC step. Supported strength using HW ECC modes are:
> + - RS: 4, 6, 8
> + - BCH: 4, 8, 14, 16
> +- nand-ecc-step-size: integer representing the number of data bytes
> + that are covered by a single ECC step. Must be 512.
Please don't re-explain nand generic DT properties, point to nand.txt
instead.
> +- wp-gpios: GPIO specifier for the write protect pin.
> +
> +Optional child node of NAND chip nodes:
> +Partitions: see partition.txt
> +
> + Example:
> + nand@70008000 {
> + compatible = "nvidia,tegra20-nand";
> + reg = <0x70008000 0x100>;
> + interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&tegra_car TEGRA20_CLK_NDFLASH>;
> + clock-names = "nand";
> + resets = <&tegra_car 13>;
> + reset-names = "nand";
> +
> + nand-chip@0 {
> + reg = <0>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + nand-bus-width = <8>;
> + nand-on-flash-bbt;
> + nand-ecc-algo = "bch";
> + nand-ecc-step-size = <512>;
In the driver you only refer to step sizes of 512 B, you can remove the
property from the bindings.
> + nand-ecc-strength = <8>;
> + wp-gpios = <&gpio TEGRA_GPIO(S, 0) GPIO_ACTIVE_LOW>;
> + };
> + };
--
Miquel Raynal, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
On Mon, May 28, 2018 at 12:23:54AM +0200, Miquel Raynal wrote:
> Hi Stefan,
>
> On Sun, 27 May 2018 23:54:38 +0200, Stefan Agner <[email protected]>
> wrote:
>
> > From: Lucas Stach <[email protected]>
> >
> > This adds the devicetree binding for the Tegra 2 NAND flash
> > controller.
> >
> > Signed-off-by: Lucas Stach <[email protected]>
> > Signed-off-by: Stefan Agner <[email protected]>
> > ---
> > .../bindings/mtd/nvidia,tegra20-nand.txt | 62 +++++++++++++++++++
> > 1 file changed, 62 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> >
> > diff --git a/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> > new file mode 100644
> > index 000000000000..49e472af1b39
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> > @@ -0,0 +1,62 @@
> > +NVIDIA Tegra NAND Flash controller
> > +
> > +Required properties:
> > +- compatible: Must be one of:
>
> Nitpick: just put the compatible here as there is only one?
No, this is how I ask people to format it.
Rob
Hi Rob,
On Wed, 30 May 2018 22:45:23 -0500, Rob Herring <[email protected]> wrote:
> On Mon, May 28, 2018 at 12:23:54AM +0200, Miquel Raynal wrote:
> > Hi Stefan,
> >
> > On Sun, 27 May 2018 23:54:38 +0200, Stefan Agner <[email protected]>
> > wrote:
> >
> > > From: Lucas Stach <[email protected]>
> > >
> > > This adds the devicetree binding for the Tegra 2 NAND flash
> > > controller.
> > >
> > > Signed-off-by: Lucas Stach <[email protected]>
> > > Signed-off-by: Stefan Agner <[email protected]>
> > > ---
> > > .../bindings/mtd/nvidia,tegra20-nand.txt | 62 +++++++++++++++++++
> > > 1 file changed, 62 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> > > new file mode 100644
> > > index 000000000000..49e472af1b39
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> > > @@ -0,0 +1,62 @@
> > > +NVIDIA Tegra NAND Flash controller
> > > +
> > > +Required properties:
> > > +- compatible: Must be one of:
> >
> > Nitpick: just put the compatible here as there is only one?
>
> No, this is how I ask people to format it.
Oh, ok, I'll remember it for my own DT patches then :)
Thanks,
Miquèl