linux-kernel - Re: [PATCH v2 2/3] ARM: dts: aspeed: ast2600evb: Add timing-phase property for eMMC controller

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Date:   Mon, 3 May 2021 18:58:19 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Andrew Jeffery <andrew@...id.au>
CC:     Rob Herring <robh+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        Hongwei Zhang <Hongweiz@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
Subject: Re: [PATCH v2 2/3] ARM: dts: aspeed: ast2600evb: Add timing-phase
 property for eMMC controller

The 05/03/2021 13:07, Andrew Jeffery wrote:
> Hi Steven,
> 
> On Mon, 3 May 2021, at 11:13, Steven Lee wrote:
> > Set eMMC input clock phase to 3, which is more stable on AST2600 EVBs.
> > 
> > Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> > ---
> >  arch/arm/boot/dts/aspeed-ast2600-evb.dts | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm/boot/dts/aspeed-ast2600-evb.dts 
> > b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> > index 2772796e215e..7a93317e27dc 100644
> > --- a/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> > +++ b/arch/arm/boot/dts/aspeed-ast2600-evb.dts
> > @@ -102,6 +102,7 @@
> >  
> >  &emmc_controller {
> >  	status = "okay";
> > +	timing-phase = <0x300FF>;
> 
> Please use the existing binding for phase corrections. The existing 
> binding is already supported by the driver (added in v5.12).
> 

Hi Andrew,

Thanks for the review.
I will add the following settings from aspeed-bmc-ibm-rainier.dts
instead of adding timing-phase in device tree.

        clk-phase-mmc-hs200 = <N> <N>;

> Andrew