2020-07-18 20:51:09

by Lubomir Rintel

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Subject: [PATCH v2 00/13] MMP DTS updates for 5.9

Hi,

chained to this message is a patch set I hope would end up queued into
soc/arm/dt for 5.9.

I've checked I'm not adding new validation errors and booted the v5.8-rc1
kernels with appended DTBs on the XO-1.75 and Dell Ariel board.

Compared to v1 I've fixed one wording error in last patch, and
added soc@ to cc.

Lubo




2020-07-18 20:51:18

by Lubomir Rintel

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Subject: [PATCH v2 01/13] ARM: dts: mmp2-olpc-xo-1-75: Fix camera I2C node validation

mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: $nodename:0:
'camera_i2c' does not match '^i2c(@.*)?'
mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: 'sda-gpios' is a required property
mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: 'scl-gpios' is a required property

The "gpios" property actually was documented as deprecated, but got dropped
in commit 0175ce4a58d6 ("dt-bindings: i2c: Convert i2c-gpio binding to
json-schema"). It's probably best kept forgotten though.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
index 6cfa0d4a18845..02f4005a654b9 100644
--- a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
+++ b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
@@ -77,10 +77,10 @@ headphone_insert {
};
};

- camera_i2c {
+ i2c {
compatible = "i2c-gpio";
- gpios = <&gpio 109 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>,
- <&gpio 108 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ sda-gpios = <&gpio 109 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ scl-gpios = <&gpio 108 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
#address-cells = <1>;
#size-cells = <0>;
i2c-gpio,timeout-ms = <1000>;
--
2.26.2

2020-07-18 20:51:26

by Lubomir Rintel

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Subject: [PATCH v2 02/13] ARM: dts: mmp2-olpc-xo-1-75: Delete #address-cells from ssp3

On the XO-1.75, this node represents a bus interface that operates in slave
mode and thus is only able to accommodate a single subnode; no address
cells are necessary.

The Documentation/devicetree/bindings/spi/spi-controller.yaml binding
prefers that we drop the property instead of setting it to zero.

This fixes a DT validation error:

arch/arm/boot/dts/mmp2-olpc-xo-1-75.dt.yaml: spi@d4037000:
{ ... } is valid under each of {'required': ['spi-slave']},
{'required': ['#address-cells']}

We also need to drop #size-cells:

arch/arm/boot/dts/mmp2-olpc-xo-1-75.dt.yaml: spi@d4037000:
'#address-cells' is a dependency of '#size-cells'

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
index 02f4005a654b9..392f546f7915b 100644
--- a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
+++ b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
@@ -221,7 +221,8 @@ accelerometer@1d {
};

&ssp3 {
- #address-cells = <0>;
+ /delete-property/ #address-cells;
+ /delete-property/ #size-cells;
spi-slave;
status = "okay";
ready-gpio = <&gpio 125 GPIO_ACTIVE_HIGH>;
--
2.26.2

2020-07-18 20:51:36

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 03/13] ARM: dts: mmp2: Add #power-domain-cells to /clocks

The power management unit, described by the soc_clocks node, controls the
power to the peripherals by the means of power domains with a single
cell -- the domain number.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index 4306f3a6742bf..9b8a156cf73e5 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -421,6 +421,7 @@ soc_clocks: clocks {
reg-names = "mpmu", "apmu", "apbc";
#clock-cells = <1>;
#reset-cells = <1>;
+ #power-domain-cells = <1>;
};
};
};
--
2.26.2

2020-07-18 20:51:42

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 05/13] ARM: dts: mmp2: Add Audio SRAM

This memory is region is where the two-channel audio DMA can pump sound
samples into the SSPA's internal FIFO.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index 9e77f685fb188..da2c92328464e 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -413,6 +413,15 @@ ssp4: spi@d4039000 {
};
};

+ asram: sram@e0000000 {
+ compatible = "mmio-sram";
+ reg = <0xe0000000 0x10000>;
+ ranges = <0 0xe0000000 0x10000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ status = "disabled";
+ };
+
soc_clocks: clocks {
compatible = "marvell,mmp2-clock";
reg = <0xd4050000 0x2000>,
--
2.26.2

2020-07-18 20:52:03

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 07/13] ARM: dts: mmp2: Add Audio Clock controller

This device generates the audio codec master clock and bit clock.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index b349f4f35706b..dd7fba65799ea 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -210,6 +210,19 @@ adma1: dma-controller@d42a0900 {
#dma-cells = <1>;
status = "disabled";
};
+
+ audio_clk: clocks@d42a0c30 {
+ compatible = "marvell,mmp2-audio-clock";
+ reg = <0xd42a0c30 0x10>;
+ clock-names = "audio", "vctcxo", "i2s0", "i2s1";
+ clocks = <&soc_clocks MMP2_CLK_AUDIO>,
+ <&soc_clocks MMP2_CLK_VCTCXO>,
+ <&soc_clocks MMP2_CLK_I2S0>,
+ <&soc_clocks MMP2_CLK_I2S1>;
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_AUDIO>;
+ #clock-cells = <1>;
+ status = "disabled";
+ };
};

apb@d4000000 { /* APB */
--
2.26.2

2020-07-18 20:52:31

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 12/13] ARM: dts: mmp3: Add the GPU

There's a GC2000 3D core accompanied by a GC300 2D core.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp3.dtsi | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/arch/arm/boot/dts/mmp3.dtsi b/arch/arm/boot/dts/mmp3.dtsi
index 57231d49d9386..cc4efd0efabd2 100644
--- a/arch/arm/boot/dts/mmp3.dtsi
+++ b/arch/arm/boot/dts/mmp3.dtsi
@@ -4,6 +4,7 @@
*/

#include <dt-bindings/clock/marvell,mmp2.h>
+#include <dt-bindings/power/marvell,mmp2.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>

/ {
@@ -310,6 +311,30 @@ camera1: camera@d420a800 {
clock-output-names = "mclk";
status = "disabled";
};
+
+ gpu_3d: gpu@d420d000 {
+ compatible = "vivante,gc";
+ reg = <0xd420d000 0x2000>;
+ interrupt-parent = <&gpu_mux>;
+ interrupts = <0>;
+ status = "disabled";
+ clocks = <&soc_clocks MMP3_CLK_GPU_3D>,
+ <&soc_clocks MMP3_CLK_GPU_BUS>;
+ clock-names = "core", "bus";
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_GPU>;
+ };
+
+ gpu_2d: gpu@d420f000 {
+ compatible = "vivante,gc";
+ reg = <0xd420f000 0x2000>;
+ interrupt-parent = <&gpu_mux>;
+ interrupts = <2>;
+ status = "disabled";
+ clocks = <&soc_clocks MMP3_CLK_GPU_2D>,
+ <&soc_clocks MMP3_CLK_GPU_BUS>;
+ clock-names = "core", "bus";
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_GPU>;
+ };
};

apb@d4000000 {
--
2.26.2

2020-07-18 20:52:50

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 13/13] ARM: dts: mmp3-dell-ariel: Enable the GPU

Enable the 2D (GC300) and the 3D (GC2000) GPUs cores.

Signed-off-by: Lubomir Rintel <[email protected]>

---
Changes since v1:
- s/GC200/GC2000/ in patch description (pointed out by Pavel Machek)

arch/arm/boot/dts/mmp3-dell-ariel.dts | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/mmp3-dell-ariel.dts b/arch/arm/boot/dts/mmp3-dell-ariel.dts
index b0ec14c421641..fe3b1cd695eeb 100644
--- a/arch/arm/boot/dts/mmp3-dell-ariel.dts
+++ b/arch/arm/boot/dts/mmp3-dell-ariel.dts
@@ -114,3 +114,11 @@ &ssp2 {
cs-gpios = <&gpio 56 GPIO_ACTIVE_LOW>;
status = "okay";
};
+
+&gpu_2d {
+ status = "okay";
+};
+
+&gpu_3d {
+ status = "okay";
+};
--
2.26.2

2020-07-18 20:53:03

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 09/13] ARM: dts: mmp2-olpc-xo-1-75: Enable audio support

This enables the audio SRAM, DMA engine, I2S interface, and codec, hooks
them together and adds a audio-graph-card instance.

It also removes the jack gpios from the gpio-keys instance, because the
audio jack driver registers an input device.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts | 65 ++++++++++++++++++-------
1 file changed, 47 insertions(+), 18 deletions(-)

diff --git a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
index 392f546f7915b..5f1da58550987 100644
--- a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
+++ b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
@@ -57,24 +57,6 @@ tablet_mode {
linux,code = <SW_TABLET_MODE>;
wakeup-source;
};
-
- microphone_insert {
- label = "Microphone Plug";
- gpios = <&gpio 96 GPIO_ACTIVE_HIGH>;
- linux,input-type = <EV_SW>;
- linux,code = <SW_MICROPHONE_INSERT>;
- debounce-interval = <100>;
- wakeup-source;
- };
-
- headphone_insert {
- label = "Headphone Plug";
- gpios = <&gpio 97 GPIO_ACTIVE_HIGH>;
- linux,input-type = <EV_SW>;
- linux,code = <SW_HEADPHONE_INSERT>;
- debounce-interval = <100>;
- wakeup-source;
- };
};

i2c {
@@ -123,6 +105,18 @@ wlan_pwrseq: pwrseq0 {
reset-gpios = <&gpio 58 GPIO_ACTIVE_HIGH>;
};

+ sound-card {
+ compatible = "audio-graph-card";
+ label = "OLPC XO";
+ dais = <&sspa0_dai>;
+ routing = "Headphones", "HPOL",
+ "Headphones", "HPOR",
+ "MIC2", "Mic Jack";
+ widgets = "Headphone", "Headphones", "Microphone", "Mic Jack";
+ hp-det-gpio = <&gpio 97 GPIO_ACTIVE_HIGH>;
+ mic-det-gpio = <&gpio 96 GPIO_ACTIVE_HIGH>;
+ };
+
soc {
axi@d4200000 {
ap-sp@d4290000 {
@@ -197,6 +191,14 @@ audio-codec@1a {
compatible = "realtek,alc5631";
reg = <0x1a>;
status = "okay";
+
+ port {
+ rt5631_0: endpoint {
+ mclk-fs = <256>;
+ clocks = <&audio_clk 0>;
+ remote-endpoint = <&sspa0_0>;
+ };
+ };
};
};

@@ -243,3 +245,30 @@ camera0_0: endpoint {
};
};
};
+
+&asram {
+ status = "okay";
+};
+
+&adma0 {
+ status = "okay";
+};
+
+&audio_clk {
+ status = "okay";
+};
+
+&sspa0 {
+ status = "okay";
+ dmas = <&adma0 0>, <&adma0 1>;
+ dma-names = "tx", "rx";
+
+ sspa0_dai: port {
+ sspa0_0: endpoint {
+ remote-endpoint = <&rt5631_0>;
+ frame-master;
+ bitclock-master;
+ dai-format = "i2s";
+ };
+ };
+};
--
2.26.2

2020-07-18 20:53:06

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 10/13] ARM: dts: mmp2: Add the GPU

There's a GC860 2D + 3D core.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index 31592acd3ef4f..445bdcd50b9ed 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -5,6 +5,7 @@
*/

#include <dt-bindings/clock/marvell,mmp2.h>
+#include <dt-bindings/power/marvell,mmp2.h>

/ {
#address-cells = <1>;
@@ -38,6 +39,17 @@ axi@d4200000 { /* AXI */
reg = <0xd4200000 0x00200000>;
ranges;

+ gpu: gpu@d420d000 {
+ compatible = "vivante,gc";
+ reg = <0xd420d000 0x4000>;
+ interrupts = <8>;
+ status = "disabled";
+ clocks = <&soc_clocks MMP2_CLK_GPU_3D>,
+ <&soc_clocks MMP2_CLK_GPU_BUS>;
+ clock-names = "core", "bus";
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_GPU>;
+ };
+
intc: interrupt-controller@d4282000 {
compatible = "mrvl,mmp2-intc";
interrupt-controller;
--
2.26.2

2020-07-18 20:53:37

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 06/13] ARM: dts: mmp2: Add DMA nodes

There is a 16-channel peripheral DMA controller along with two-channel
audio DMA engines.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index da2c92328464e..b349f4f35706b 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -192,6 +192,24 @@ camera1: camera@d420a800 {
clock-output-names = "mclk";
status = "disabled";
};
+
+ adma0: dma-controller@d42a0800 {
+ compatible = "marvell,adma-1.0";
+ reg = <0xd42a0800 0x100>;
+ interrupts = <48>;
+ #dma-cells = <1>;
+ asram = <&asram>;
+ iram = <&asram>;
+ status = "disabled";
+ };
+
+ adma1: dma-controller@d42a0900 {
+ compatible = "marvell,adma-1.0";
+ reg = <0xd42a0900 0x100>;
+ interrupts = <48>;
+ #dma-cells = <1>;
+ status = "disabled";
+ };
};

apb@d4000000 { /* APB */
@@ -201,6 +219,14 @@ apb@d4000000 { /* APB */
reg = <0xd4000000 0x00200000>;
ranges;

+ dma-controller@d4000000 {
+ compatible = "marvell,pdma-1.0";
+ reg = <0xd4000000 0x10000>;
+ interrupts = <48>;
+ #dma-channels = <16>;
+ status = "disabled";
+ };
+
timer0: timer@d4014000 {
compatible = "mrvl,mmp-timer";
reg = <0xd4014000 0x100>;
--
2.26.2

2020-07-18 20:53:57

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 08/13] ARM: dts: mmp2: Add SSPA nodes

There are two I2S-capable audio serial port blocks.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index dd7fba65799ea..31592acd3ef4f 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -223,6 +223,32 @@ audio_clk: clocks@d42a0c30 {
#clock-cells = <1>;
status = "disabled";
};
+
+ sspa0: audio-controller@d42a0c00 {
+ compatible = "marvell,mmp-sspa";
+ reg = <0xd42a0c00 0x30>,
+ <0xd42a0c80 0x30>;
+ interrupts = <2>;
+ clock-names = "audio", "bitclk";
+ clocks = <&soc_clocks MMP2_CLK_AUDIO>,
+ <&audio_clk 1>;
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_AUDIO>;
+ #sound-dai-cells = <0>;
+ status = "disabled";
+ };
+
+ sspa1: audio-controller@d42a0d00 {
+ compatible = "marvell,mmp-sspa";
+ reg = <0xd42a0d00 0x30>,
+ <0xd42a0d80 0x30>;
+ interrupts = <3>;
+ clock-names = "audio", "bitclk";
+ clocks = <&soc_clocks MMP2_CLK_AUDIO>,
+ <&audio_clk 2>;
+ power-domains = <&soc_clocks MMP2_POWER_DOMAIN_AUDIO>;
+ #sound-dai-cells = <0>;
+ status = "disabled";
+ };
};

apb@d4000000 { /* APB */
--
2.26.2

2020-07-18 20:54:22

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 11/13] ARM: dts: mmp2-olpc-xo-1-75: Enable the GPU

Enable the 3D + 2D (GC860) GPU core.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
index 5f1da58550987..f1a41152e9dd7 100644
--- a/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
+++ b/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts
@@ -272,3 +272,7 @@ sspa0_0: endpoint {
};
};
};
+
+&gpu {
+ status = "okay";
+};
--
2.26.2

2020-07-18 20:54:44

by Lubomir Rintel

[permalink] [raw]
Subject: [PATCH v2 04/13] ARM: dts: mmp2: Extend the MPMU reg range

The ACGR register is at the offset of 0x1024, beyond the 4k originally
assigned to the MPMU range.

Signed-off-by: Lubomir Rintel <[email protected]>
---
arch/arm/boot/dts/mmp2.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/mmp2.dtsi b/arch/arm/boot/dts/mmp2.dtsi
index 9b8a156cf73e5..9e77f685fb188 100644
--- a/arch/arm/boot/dts/mmp2.dtsi
+++ b/arch/arm/boot/dts/mmp2.dtsi
@@ -415,7 +415,7 @@ ssp4: spi@d4039000 {

soc_clocks: clocks {
compatible = "marvell,mmp2-clock";
- reg = <0xd4050000 0x1000>,
+ reg = <0xd4050000 0x2000>,
<0xd4282800 0x400>,
<0xd4015000 0x1000>;
reg-names = "mpmu", "apmu", "apbc";
--
2.26.2

2020-11-10 03:21:52

by Florian Fainelli

[permalink] [raw]
Subject: Re: [PATCH v2 02/13] ARM: dts: mmp2-olpc-xo-1-75: Delete #address-cells from ssp3



On 7/18/2020 1:50 PM, Lubomir Rintel wrote:
> On the XO-1.75, this node represents a bus interface that operates in slave
> mode and thus is only able to accommodate a single subnode; no address
> cells are necessary.
>
> The Documentation/devicetree/bindings/spi/spi-controller.yaml binding
> prefers that we drop the property instead of setting it to zero.
>
> This fixes a DT validation error:
>
> arch/arm/boot/dts/mmp2-olpc-xo-1-75.dt.yaml: spi@d4037000:
> { ... } is valid under each of {'required': ['spi-slave']},
> {'required': ['#address-cells']}
>
> We also need to drop #size-cells:
>
> arch/arm/boot/dts/mmp2-olpc-xo-1-75.dt.yaml: spi@d4037000:
> '#address-cells' is a dependency of '#size-cells'
>
> Signed-off-by: Lubomir Rintel <[email protected]>

This patch causes the following warning to be issued when validating the
mmp2 DTS files against specific bindings:

arch/arm/boot/dts/mmp2.dtsi:472.23-480.6: Warning (spi_bus_bridge):
/soc/apb@d4000000/spi@d4037000: incorrect #address-cells for SPI bus
also defined at arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts:225.7-237.3
arch/arm/boot/dts/mmp2.dtsi:472.23-480.6: Warning (spi_bus_bridge):
/soc/apb@d4000000/spi@d4037000: incorrect #size-cells for SPI bus
also defined at arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts:225.7-237.3
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dt.yaml: Warning (spi_bus_reg):
Failed prerequisite 'spi_bus_bridge'

Is there a fix that we can apply to silence this warning? Thanks!
--
Florian