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

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Message-Id: <f237a53e-ad61-469a-a19f-8a1e52c6cfba@www.fastmail.com>
Date:   Mon, 03 May 2021 14:37:47 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Steven Lee" <steven_lee@...eedtech.com>,
        "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>
Cc:     "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

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).

Andrew