linux-kernel - Re: [Linux-stm32] [PATCH v3 3/3] ARM: dts: stm32: add initial support for stm32mp157-odyssey board

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Date:   Wed, 22 Jul 2020 14:09:51 +0200
From:   Christophe Kerello <christophe.kerello@...com>
To:     Marcin Sloniewski <marcin.sloniewski@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Rob Herring <robh@...nel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        <linux-kernel@...r.kernel.org>, Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Sam Ravnborg <sam@...nborg.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>
Subject: Re: [Linux-stm32] [PATCH v3 3/3] ARM: dts: stm32: add initial support
 for stm32mp157-odyssey board

Hello Marcin,

On 7/21/20 8:53 PM, Marcin Sloniewski wrote:
> +&sdmmc2 {
> +	pinctrl-names = "default", "opendrain", "sleep";
> +	pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>;
> +	pinctrl-1 = <&sdmmc2_b4_od_pins_a &sdmmc2_d47_pins_a>;
> +	pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_d47_sleep_pins_a>;
> +	non-removable;
> +	no-sd;
> +	no-sdio;
> +	st,neg-edge;
> +	bus-width = <4>;
> +	vmmc-supply = <&v3v3>;
> +	vqmmc-supply = <&v3v3>;
> +	mmc-ddr-3_3v;
> +	status = "okay";
> +};

Based on the pins muxed, 8 data lines are configured, but the bus width 
is set to 4. What is the reason of not setting this property to 8?

Regards,
Christophe Kerello.