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

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Message-ID: <HK0PR06MB27862907BFE7C299AD78B926B28F9@HK0PR06MB2786.apcprd06.prod.outlook.com>
Date:   Sat, 6 Nov 2021 10:01:35 +0000
From:   Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
To:     Andrew Jeffery <andrew@...id.au>, 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" <linux-aspeed@...ts.ozlabs.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
CC:     BMC-SW <BMC-SW@...eedtech.com>,
        Steven Lee <steven_lee@...eedtech.com>
Subject: RE: [PATCH 03/10] dts: aspeed: ast2600: Support SDR50 for SD device

> -----Original Message-----
> From: Andrew Jeffery <andrew@...id.au>
> Sent: Tuesday, October 26, 2021 8:43 AM
> 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?
> 

Okay, it will be updated in the next patch version.

> 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

Chin-Ting