linux-kernel - Re: [PATCH v2 8/8] pinctrl: stm32: Add STM32H750 MCU pinctrl support

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Date:   Mon, 29 Mar 2021 10:00:11 +0200
From:   Alexandre TORGUE <alexandre.torgue@...s.st.com>
To:     <dillon.minfei@...il.com>, <robh+dt@...nel.org>,
        <a.fatoum@...gutronix.de>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux@...linux.org.uk>,
        <vladimir.murzin@....com>, <afzal.mohd.ma@...il.com>
Subject: Re: [PATCH v2 8/8] pinctrl: stm32: Add STM32H750 MCU pinctrl support

Hi Dillon

On 3/12/21 7:24 AM, dillon.minfei@...il.com wrote:
> From: dillon min <dillon.minfei@...il.com>
> 
> This patch adds STM32H750 pinctrl and GPIO support
> since stm32h750 has the same pin alternate functions
> with stm32h743, so just reuse the stm32h743's pinctrl
> driver
> 
> Signed-off-by: dillon min <dillon.minfei@...il.com>
> ---
> v2:
> - add compatible string st,stm32h750-pinctrl to pinctl-stm32h743.c as they
>    have same pin alternate functions
> - add STM32H750 to Kconfig description
> 
>   drivers/pinctrl/stm32/Kconfig             | 2 +-
>   drivers/pinctrl/stm32/pinctrl-stm32h743.c | 3 +++
>   2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/stm32/Kconfig b/drivers/pinctrl/stm32/Kconfig
> index f36f29113370..fb1ffc94c57f 100644
> --- a/drivers/pinctrl/stm32/Kconfig
> +++ b/drivers/pinctrl/stm32/Kconfig
> @@ -35,7 +35,7 @@ config PINCTRL_STM32F769
>   	select PINCTRL_STM32
>   
>   config PINCTRL_STM32H743
> -	bool "STMicroelectronics STM32H743 pin control" if COMPILE_TEST && !MACH_STM32H743
> +	bool "STMicroelectronics STM32H743/STM32H750 pin control" if COMPILE_TEST && !MACH_STM32H743
>   	depends on OF && HAS_IOMEM
>   	default MACH_STM32H743
>   	select PINCTRL_STM32
> diff --git a/drivers/pinctrl/stm32/pinctrl-stm32h743.c b/drivers/pinctrl/stm32/pinctrl-stm32h743.c
> index ffe7b5271506..700206c7bc11 100644
> --- a/drivers/pinctrl/stm32/pinctrl-stm32h743.c
> +++ b/drivers/pinctrl/stm32/pinctrl-stm32h743.c
> @@ -1966,6 +1966,9 @@ static const struct of_device_id stm32h743_pctrl_match[] = {
>   		.compatible = "st,stm32h743-pinctrl",
>   		.data = &stm32h743_match_data,
>   	},
> +	{	.compatible = "st,stm32h750-pinctrl",
> +		.data = &stm32h743_match_data,
> +	},

If you use exactly the same driver (i.e. same ball out and AF mux) then 
you don't have to create a new compatible for that. Just use the same 
than h743.(so you don't have to factorize DT files).

Regards
Alex

>   	{ }
>   };
>   
>