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Date: Thu, 5 Nov 2020 07:50:34 -0600
From: Rob Herring <robh+dt@...nel.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Markus Reichl <m.reichl@...etechno.de>,
Chanwoo Choi <cw00.choi@...sung.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: exynos: Use fixed index for the MMC devices
On Thu, Nov 5, 2020 at 5:48 AM Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
>
> Recently introduced asynchronous probe on the MMC devices can shuffle
> block IDs in the system. Pin them to values equal to the physical MMC bus
> number to ease booting in environments where UUIDs are not practical.
How's that going to help for existing DTs?
> Use newly introduced aliases for mmcblk devices from commit fa2d0aa96941
> ("mmc: core: Allow setting slot index via device tree alias").
>
> Suggested-by: Markus Reichl <m.reichl@...etechno.de>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> arch/arm/boot/dts/exynos3250.dtsi | 3 +++
> arch/arm/boot/dts/exynos4.dtsi | 2 ++
> arch/arm/boot/dts/exynos4210.dtsi | 1 +
> arch/arm/boot/dts/exynos4412.dtsi | 1 +
> arch/arm/boot/dts/exynos5250.dtsi | 4 ++++
> arch/arm/boot/dts/exynos5260.dtsi | 3 +++
> arch/arm/boot/dts/exynos5410.dtsi | 3 +++
> arch/arm/boot/dts/exynos5420.dtsi | 3 +++
> 8 files changed, 20 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 75ed82600ec8..510080bb4102 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -28,6 +28,9 @@
> aliases {
> pinctrl0 = &pinctrl_0;
> pinctrl1 = &pinctrl_1;
> + mmc0 = &mshc_0;
> + mmc1 = &mshc_1;
> + mmc2 = &mshc_2;
> mshc0 = &mshc_0;
Then what's this for? Do you need multiple aliases to the same device?
And pinctrl aliases are odd too and should be removed.
> mshc1 = &mshc_1;
> mshc2 = &mshc_2;
> diff --git a/arch/arm/boot/dts/exynos4.dtsi b/arch/arm/boot/dts/exynos4.dtsi
> index a1e54449f33f..e266f890eea4 100644
> --- a/arch/arm/boot/dts/exynos4.dtsi
> +++ b/arch/arm/boot/dts/exynos4.dtsi
> @@ -45,6 +45,8 @@
> fimc1 = &fimc_1;
> fimc2 = &fimc_2;
> fimc3 = &fimc_3;
Another odd one...
> + mmc1 = &sdhci_1;
> + mmc2 = &sdhci_2;
> serial0 = &serial_0;
> serial1 = &serial_1;
> serial2 = &serial_2;
> diff --git a/arch/arm/boot/dts/exynos4210.dtsi b/arch/arm/boot/dts/exynos4210.dtsi
> index fddc661ded28..f1d0d5959b7f 100644
> --- a/arch/arm/boot/dts/exynos4210.dtsi
> +++ b/arch/arm/boot/dts/exynos4210.dtsi
> @@ -23,6 +23,7 @@
> compatible = "samsung,exynos4210", "samsung,exynos4";
>
> aliases {
> + mmc0 = &sdhci_0;
> pinctrl0 = &pinctrl_0;
> pinctrl1 = &pinctrl_1;
> pinctrl2 = &pinctrl_2;
> diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi
> index fa8e8d6bc4d5..9fcf7383eb9d 100644
> --- a/arch/arm/boot/dts/exynos4412.dtsi
> +++ b/arch/arm/boot/dts/exynos4412.dtsi
> @@ -28,6 +28,7 @@
> pinctrl3 = &pinctrl_3;
> fimc-lite0 = &fimc_lite_0;
> fimc-lite1 = &fimc_lite_1;
> + mmc0 = &mshc_0;
> mshc0 = &mshc_0;
> };
>
> diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
> index 84677332a5a2..0a0436f92fac 100644
> --- a/arch/arm/boot/dts/exynos5250.dtsi
> +++ b/arch/arm/boot/dts/exynos5250.dtsi
> @@ -30,6 +30,10 @@
> gsc1 = &gsc_1;
> gsc2 = &gsc_2;
> gsc3 = &gsc_3;
> + mmc0 = &mmc_0;
> + mmc1 = &mmc_1;
> + mmc2 = &mmc_2;
> + mmc3 = &mmc_3;
> mshc0 = &mmc_0;
> mshc1 = &mmc_1;
> mshc2 = &mmc_2;
> diff --git a/arch/arm/boot/dts/exynos5260.dtsi b/arch/arm/boot/dts/exynos5260.dtsi
> index 973448c4ad93..64bf1d8dc33b 100644
> --- a/arch/arm/boot/dts/exynos5260.dtsi
> +++ b/arch/arm/boot/dts/exynos5260.dtsi
> @@ -21,6 +21,9 @@
> i2c1 = &hsi2c_1;
> i2c2 = &hsi2c_2;
> i2c3 = &hsi2c_3;
> + mmc0 = &mmc_0;
> + mmc1 = &mmc_1;
> + mmc2 = &mmc_2;
> pinctrl0 = &pinctrl_0;
> pinctrl1 = &pinctrl_1;
> pinctrl2 = &pinctrl_2;
> diff --git a/arch/arm/boot/dts/exynos5410.dtsi b/arch/arm/boot/dts/exynos5410.dtsi
> index 584ce62361b1..503859153769 100644
> --- a/arch/arm/boot/dts/exynos5410.dtsi
> +++ b/arch/arm/boot/dts/exynos5410.dtsi
> @@ -24,6 +24,9 @@
> pinctrl1 = &pinctrl_1;
> pinctrl2 = &pinctrl_2;
> pinctrl3 = &pinctrl_3;
> + mmc0 = &mmc_0;
> + mmc1 = &mmc_1;
> + mmc2 = &mmc_2;
> };
>
> cpus {
> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index 23a8fd5c8a6e..3a3eadd890fb 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -19,6 +19,9 @@
> compatible = "samsung,exynos5420", "samsung,exynos5";
>
> aliases {
> + mmc0 = &mmc_0;
> + mmc1 = &mmc_1;
> + mmc2 = &mmc_2;
> mshc0 = &mmc_0;
> mshc1 = &mmc_1;
> mshc2 = &mmc_2;
> --
> 2.17.1
>
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