linux-kernel - RE: [PATCH] arm64: dts: ls1028a: make the eMMC and SD card controllers use fixed indices

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Message-ID: <AM7PR04MB688536E10A0B35D75A9F8F34F8FF0@AM7PR04MB6885.eurprd04.prod.outlook.com>
Date:   Fri, 20 Nov 2020 02:04:02 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        Shawn Guo <shawnguo@...nel.org>, Leo Li <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ashish Kumar <ashish.kumar@....com>,
        Michael Walle <michael@...le.cc>
Subject: RE: [PATCH] arm64: dts: ls1028a: make the eMMC and SD card
 controllers use fixed indices

Hi Vladimir,

I have already upstreamed a patch for all affected layerscape boards.
https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git/commit/?h=imx/dt64&id=342ab37ecaf8c1b10dd3ca9a1271db29a6af0705

Please check whether it works for you.
Thanks.

Best regards,
Yangbo Lu

> -----Original Message-----
> From: Vladimir Oltean <vladimir.oltean@....com>
> Sent: Thursday, November 19, 2020 11:50 PM
> To: Shawn Guo <shawnguo@...nel.org>; Leo Li <leoyang.li@....com>; Rob
> Herring <robh+dt@...nel.org>; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org
> Cc: Adrian Hunter <adrian.hunter@...el.com>; Ulf Hansson
> <ulf.hansson@...aro.org>; linux-mmc@...r.kernel.org;
> linux-kernel@...r.kernel.org; Ashish Kumar <ashish.kumar@....com>; Y.b. Lu
> <yangbo.lu@....com>; Michael Walle <michael@...le.cc>
> Subject: [PATCH] arm64: dts: ls1028a: make the eMMC and SD card
> controllers use fixed indices
> 
> As the boot order in the kernel continues to change, sometimes it may
> happen that the eSDHC controller mmc@...0000 (the one for eMMC) gets
> probed before the one at mmc@...0000 (for external SD cards). The effect
> is that the eMMC controller gets the /dev/mmcblk0 name, and the SD card
> gets /dev/mmcblk1.
> 
> Since the introduction of this SoC, that has never happened in practice,
> even though it was never guaranteed in theory. Setting
> "root=/dev/mmcblk0p2" in /proc/cmdline has always caused the kernel to
> use the second partition from the SD card as the rootfs.
> 
> Preserve that old behavior by adding some aliases which create naming
> consistency:
> - the SD card controller uses /dev/mmcblk0
> - the eMMC controller uses /dev/mmcblk1
> 
> The aliases are parsed by mmc_alloc_host() in drivers/mmc/core/host.c.
> 
> Cc: Ashish Kumar <Ashish.Kumar@....com>
> Cc: Yangbo Lu <yangbo.lu@....com>
> Cc: Michael Walle <michael@...le.cc>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>  arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts | 2 ++
>  arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts          | 2 ++
>  arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts          | 2 ++
>  3 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts
> index 8161dd237971..7d292999f8da 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts
> @@ -23,6 +23,8 @@ aliases {
>  		serial2 = &lpuart1;
>  		spi0 = &fspi;
>  		spi1 = &dspi2;
> +		mmc0 = &esdhc;
> +		mmc1 = &esdhc1;
>  	};
> 
>  	buttons0 {
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
> index 13cdc958ba3e..c0786b713791 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-qds.dts
> @@ -23,6 +23,8 @@ aliases {
>  		gpio2 = &gpio3;
>  		serial0 = &duart0;
>  		serial1 = &duart1;
> +		mmc0 = &esdhc;
> +		mmc1 = &esdhc1;
>  	};
> 
>  	chosen {
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> index 1efb61cff454..c1d1ba459307 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> @@ -19,6 +19,8 @@ aliases {
>  		crypto = &crypto;
>  		serial0 = &duart0;
>  		serial1 = &duart1;
> +		mmc0 = &esdhc;
> +		mmc1 = &esdhc1;
>  	};
> 
>  	chosen {
> --
> 2.25.1