linux-kernel - Re: [PATCH v1 3/4] pinctrl: samsung: change PINCTRL

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Date:   Tue, 21 Sep 2021 09:27:42 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Will McVicker <willmcvicker@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Lee Jones <lee.jones@...aro.org>, kernel-team@...roid.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v1 3/4] pinctrl: samsung: change PINCTRL_EXYNOS default
 config logic

On 20/09/2021 21:03, Will McVicker wrote:
> Switching the default config logic of PINCTRL_EXYNOS to use "default
> y if ARCH_EXYNOS" versus having ARCH_EXYNOS directly select the config.
> This gives vendors the flexibility to disable the config or modularize
> it in the presence of a generic kernel.

Reasoning is incorrect. This is an essential driver which CANNOT be
disabled for any kernel having ARCH_EXYNOS or ARCH_S5PV210. You are
trying to prepare it for some out-of-tree code? Please, upstream your
code instead.

> 
> Verified this change doesn't effect the .config.
> 
> Signed-off-by: Will McVicker <willmcvicker@...gle.com>
> ---
>  arch/arm64/Kconfig.platforms    | 1 -
>  drivers/pinctrl/samsung/Kconfig | 1 +
>  2 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> index 6a006490c9b9..a884e5da8b0f 100644
> --- a/arch/arm64/Kconfig.platforms
> +++ b/arch/arm64/Kconfig.platforms
> @@ -93,7 +93,6 @@ config ARCH_EXYNOS
>  	bool "ARMv8 based Samsung Exynos SoC family"
>  	select HAVE_S3C_RTC if RTC_CLASS
>  	select PINCTRL
> -	select PINCTRL_EXYNOS
>  	select PM_GENERIC_DOMAINS if PM
>  	help
>  	  This enables support for ARMv8 based Samsung Exynos SoC family.
> diff --git a/drivers/pinctrl/samsung/Kconfig b/drivers/pinctrl/samsung/Kconfig
> index dfd805e76862..483acb8ac1f6 100644
> --- a/drivers/pinctrl/samsung/Kconfig
> +++ b/drivers/pinctrl/samsung/Kconfig
> @@ -12,6 +12,7 @@ config PINCTRL_EXYNOS
>  	bool "Pinctrl common driver part for Samsung Exynos SoCs"
>  	depends on OF_GPIO
>  	depends on ARCH_EXYNOS || ARCH_S5PV210 || COMPILE_TEST
> +	default y if ARCH_EXYNOS

default ARCH_EXYNOS || ARCH_S5PV210
... and update all mach Kconfigs.

>  	select PINCTRL_SAMSUNG
>  	select PINCTRL_EXYNOS_ARM if ARM && (ARCH_EXYNOS || ARCH_S5PV210)
>  	select PINCTRL_EXYNOS_ARM64 if ARM64 && ARCH_EXYNOS
> 


Best regards,
Krzysztof