linux-kernel - Re: [PATCH 2/3] ARM: dts: sun5i: Add port E pinmux settings for mmc2

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Date:   Sun, 16 Apr 2023 01:47:56 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Jonathan McDowell <noodles@...th.li>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ARM: dts: sun5i: Add port E pinmux settings for
 mmc2

On Sat, 15 Apr 2023 18:46:24 +0100
Jonathan McDowell <noodles@...th.li> wrote:

Hi,

> These alternate pins for mmc2 are brought out to the 40 pin U14 header
> on the C.H.I.P and can be used to add an external MMC device with a 4
> bit interface. See
> 
> https://byteporter.com/ntc-chip-micro-sd-slot/
> 
> for further details on how.
> 
> Signed-off-by: Jonathan McDowell <noodles@...th.li>
> ---
>  arch/arm/boot/dts/sun5i.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi
> index 250d6b87ab4d..e4922506ce22 100644
> --- a/arch/arm/boot/dts/sun5i.dtsi
> +++ b/arch/arm/boot/dts/sun5i.dtsi
> @@ -517,6 +517,14 @@ mmc2_4bit_pc_pins: mmc2-4bit-pc-pins {
>  				bias-pull-up;
>  			};
> 

As this seems to be a highly non-standard and rare modification, that
doesn't even get used in the mainline DT, please add a:
			/omit-if-no-ref/
line, so we don't get this into every sun5i board.

Otherwise looks good, though I don't know if that should belong into
the same DT overlay that is probably used to also enable the MMC2 node.

Cheers,
Andre


> +			mmc2_4bit_pe_pins: mmc2-4bit-pe-pins {
> +				pins = "PE4", "PE5", "PE6", "PE7",
> +				       "PE8", "PE9";
> +				function = "mmc2";
> +				drive-strength = <30>;
> +				bias-pull-up;
> +			};
> +
>  			mmc2_8bit_pins: mmc2-8bit-pins {
>  				pins = "PC6", "PC7", "PC8", "PC9",
>  				       "PC10", "PC11", "PC12", "PC13",