linux-kernel - Re: [PATCH 03/10] dts: aspeed: ast2600: Support SDR50 for SD device

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Date:   Tue, 26 Oct 2021 11:12:34 +1030
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Chin-Ting Kuo" <chin-ting_kuo@...eedtech.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....id.au>,
        "Michael Turquette" <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...nel.org>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     BMC-SW@...eedtech.com, "Steven Lee" <steven_lee@...eedtech.com>
Subject: Re: [PATCH 03/10] dts: aspeed: ast2600: Support SDR50 for SD device



On Wed, 22 Sep 2021, at 20:01, Chin-Ting Kuo wrote:
> The maximum frequency for SD controller on AST2600 EVB is
> 100MHz. In order to achieve 100MHz, sd-uhs-sdr50 property
> should be added and the driver will set the SDR50 supported
> bit in capability 2 register during probing stage.
>
> Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>

As this is a limitation of the SoC it should be done in aspeed-g6.dtsi. 
Unless I've misunderstood?

Andrew

> ---
>  arch/arm/boot/dts/aspeed-ast2600-evb.dts | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/boot/dts/aspeed-ast2600-evb.dts 
> b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> index b7eb552640cb..4551dba499c2 100644
> --- a/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> +++ b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> @@ -280,6 +280,7 @@
>  &sdhci0 {
>  	status = "okay";
>  	bus-width = <4>;
> +	sd-uhs-sdr50;
>  	max-frequency = <100000000>;
>  	sdhci-drive-type = /bits/ 8 <3>;
>  	sdhci-caps-mask = <0x7 0x0>;
> @@ -292,6 +293,7 @@
>  &sdhci1 {
>  	status = "okay";
>  	bus-width = <4>;
> +	sd-uhs-sdr50;
>  	max-frequency = <100000000>;
>  	sdhci-drive-type = /bits/ 8 <3>;
>  	sdhci-caps-mask = <0x7 0x0>;
> -- 
> 2.17.1