linux-kernel - Re: [PATCH] ARM: dts: microchip: sama7d65: Add GPIO buttons and LEDs

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Message-ID: <fa5d44ca-d1ea-4c72-a998-b10f098b25f8@microchip.com>
Date: Wed, 10 Sep 2025 10:16:03 -0700
From: Ryan Wanner <ryan.wanner@...rochip.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: microchip: sama7d65: Add GPIO buttons and LEDs

On 9/9/25 23:25, Alexander Dahl wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hello Ryan,
> 
> Am Wed, Sep 10, 2025 at 08:20:28AM +0200 schrieb Alexander Dahl:
>> Hello Ryan,
>>
>> Am Tue, Sep 09, 2025 at 09:08:38AM -0700 schrieb Ryan.Wanner@...rochip.com:
>>> From: Ryan Wanner <Ryan.Wanner@...rochip.com>
>>>
>>> Add the USER button as a GPIO input as well as add the LEDs and enable
>>> the blue LED as a heartbeat.
>>>
>>> Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
>>> ---
>>>  .../dts/microchip/at91-sama7d65_curiosity.dts | 49 +++++++++++++++++++
>>>  1 file changed, 49 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
>>> index f091cc40a9f0..2fe34c59d942 100644
>>> --- a/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
>>> +++ b/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
>>> @@ -11,6 +11,7 @@
>>>  #include "sama7d65-pinfunc.h"
>>>  #include "sama7d65.dtsi"
>>>  #include <dt-bindings/mfd/atmel-flexcom.h>
>>> +#include <dt-bindings/input/input.h>
>>>  #include <dt-bindings/pinctrl/at91.h>
>>>
>>>  / {
>>> @@ -26,6 +27,42 @@ chosen {
>>>             stdout-path = "serial0:115200n8";
>>>     };
>>>
>>> +   gpio-keys {
>>> +           compatible = "gpio-keys";
>>> +
>>> +           pinctrl-names = "default";
>>> +           pinctrl-0 = <&pinctrl_key_gpio_default>;
>>> +
>>> +           button {
>>> +                   label = "PB_USER";
>>> +                   gpios = <&pioa PIN_PC10 GPIO_ACTIVE_LOW>;
>>> +                   linux,code = <KEY_PROG1>;
>>> +                   wakeup-source;
>>> +           };
>>> +   };
>>> +
>>> +   leds {
>>> +           compatible = "gpio-leds";
>>> +           pinctrl-names = "default";
>>> +           pinctrl-0 = <&pinctrl_led_gpio_default>;
>>> +
>>> +           led-red {
>>> +                   label = "red";
>>> +                   gpios = <&pioa PIN_PB17 GPIO_ACTIVE_HIGH>; /* Conflict with pwm. */
>>> +           };
>>> +
>>> +           led-green {
>>> +                   label = "green";
>>> +                   gpios = <&pioa PIN_PB15 GPIO_ACTIVE_HIGH>; /* Conflict with pwm. */
>>> +           };
>>> +
>>> +           led-blue {
>>> +                   label = "blue";
>>> +                   gpios = <&pioa PIN_PA21 GPIO_ACTIVE_HIGH>;
>>> +                   linux,default-trigger = "heartbeat";
>>> +           };
>>> +   };
>>
>> The label property is deprecated.  Please use the properties "color"
>> and "function" for new boards.  See devicetree binding documentation
>> for LEDs.
> 
> From a quick glance, this seems to be an RGB-LED, so I would suggest
> to not model it as three distinct LEDs, but make use of the
> "leds-group-multicolor" feature, example:
> 
>  59         multi-led {
>  60                 compatible = "leds-group-multicolor";
>  61                 color = <LED_COLOR_ID_RGB>;
>  62                 function = LED_FUNCTION_INDICATOR;
>  63                 leds = <&led_red>, <&led_green>, <&led_blue>;
>  64         };

I see, I was not aware of this feature. This would combine all of the
LED pins into one RGB light correct, it seems from sysfs that this is
the case.

Would having the default-trigger="heartbeat" still be allowed for the
led-blue node or should that be moved into the multi-led node? From the
bindings it seems that the default trigger is still in the gpio-led nodes.

Best,
Ryan
> 
> Greets
> Alex
> 
>>
>> Thanks and greetings
>> Alex
>>
>>> +
>>>     memory@...00000 {
>>>             device_type = "memory";
>>>             reg = <0x60000000 0x40000000>;
>>> @@ -352,6 +389,18 @@ pinctrl_i2c10_default: i2c10-default {
>>>             bias-pull-up;
>>>     };
>>>
>>> +   pinctrl_key_gpio_default: key-gpio-default {
>>> +           pinmux = <PIN_PC10__GPIO>;
>>> +           bias-pull-up;
>>> +   };
>>> +
>>> +   pinctrl_led_gpio_default: led-gpio-default {
>>> +           pinmux = <PIN_PB15__GPIO>,
>>> +                    <PIN_PB17__GPIO>,
>>> +                    <PIN_PA21__GPIO>;
>>> +           bias-pull-up;
>>> +   };
>>> +
>>>     pinctrl_sdmmc1_default: sdmmc1-default {
>>>             cmd-data {
>>>                     pinmux = <PIN_PB22__SDMMC1_CMD>,
>>> --
>>> 2.43.0
>>>
>>>
>>