linux-kernel - Re: [PATCH 1/2] arm64: dts: exynos: drop mshc aliases

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Date:   Sat, 04 Feb 2023 12:43:09 +0100
From:   David Virag <virag.david003@...il.com>
To:     Henrik Grimler <henrik@...mler.se>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, alim.akhtar@...sung.com,
        m.szyprowski@...sung.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 1/2] arm64: dts: exynos: drop mshc aliases

On Fri, 2023-02-03 at 21:39 +0100, Henrik Grimler wrote:
> They are no longer needed after commit a13e8ef6008d ("mmc: dw_mmc:
> exynos: use common_caps").
> 
> Signed-off-by: Henrik Grimler <henrik@...mler.se>
> ---
>  arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 2 --
>  arch/arm64/boot/dts/exynos/exynos7-espresso.dts       | 2 --
>  2 files changed, 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> index f54f30633417..c895b70b3cec 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> @@ -40,8 +40,6 @@ aliases {
>                 spi2 = &spi_2;
>                 spi3 = &spi_3;
>                 spi4 = &spi_4;
> -               mshc0 = &mshc_0;
> -               mshc2 = &mshc_2;
>         };
>  
>         chosen {
> diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> index f3f4a6ab4b49..686f0923a4a7 100644
> --- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> +++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> @@ -18,8 +18,6 @@ / {
>  
>         aliases {
>                 serial0 = &serial_2;
> -               mshc0 = &mmc_0;
> -               mshc2 = &mmc_2;
>         };
>  
>         chosen {

In dw_mmc-exynos.c, there's a caps array specified like this:

/* Common capabilities of Exynos4/Exynos5 SoC */
static unsigned long exynos_dwmmc_caps[4] = {
	MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA,
	0,
	0,
	0,
};

As I understand these capabilities are added to the mmc controllers
based on mshc alias id. Shouldn't these capabilities be moved to
device-tree before removing these aliases? This also applies to the
32bit arm patch. If I understand correctly, removing these aliases
without adding the capabilities to dt removes the capability
"MMC_CAP_1_8V_DDR" and "MMC_CAP_8_BIT_DATA" from mshc_0/mmc_0.

Best regards,
David