linux-kernel - RE: [PATCH 4/5] ARM: dts: imxrt1050: remove mmc max-frequency property

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Date:   Tue, 18 Oct 2022 03:01:47 +0000
From:   Bough Chen <haibo.chen@....com>
To:     Giulio Benetti <giulio.benetti@...ettiengineering.com>,
        "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>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
CC:     Stephen Boyd <sboyd@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: RE: [PATCH 4/5] ARM: dts: imxrt1050: remove mmc max-frequency
 property

> -----Original Message-----
> From: Giulio Benetti <giulio.benetti@...ettiengineering.com>
> Sent: 2022年10月18日 7:56
> To: devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; linux-clk@...r.kernel.org;
> linux-mmc@...r.kernel.org
> Cc: Stephen Boyd <sboyd@...nel.org>; Bough Chen <haibo.chen@....com>;
> Adrian Hunter <adrian.hunter@...el.com>; Ulf Hansson
> <ulf.hansson@...aro.org>; Giulio Benetti
> <giulio.benetti@...ettiengineering.com>
> Subject: [PATCH 4/5] ARM: dts: imxrt1050: remove mmc max-frequency
> property
> 
> According to i.MXRT1050 Reference Manual usdhc supports up to 208Mhz clock

Please double check this. As I know, the i.MXRT1050 and i.MX6/7/8/9 series use the same usdhc IP, maybe include some small difference.
For the usdhc in i.MX6/7/8/9, I confirmed with IC team, the card clock output from usdhc can't be upper than 200MHz, otherwise maybe meet some stable related issue.
So here I think should change to like this:
 max-frequency = <200000000>;


Best Regards
Haibo Chen


> so let's remove max-frequency property in the .dtsi base file and in case add
> that property in the board specific .dts file for a specific device connected to it.
> 
> Signed-off-by: Giulio Benetti <giulio.benetti@...ettiengineering.com>
> ---
>  arch/arm/boot/dts/imxrt1050.dtsi | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/imxrt1050.dtsi
> b/arch/arm/boot/dts/imxrt1050.dtsi
> index 114465e4dde6..0b44cc4ce6ad 100644
> --- a/arch/arm/boot/dts/imxrt1050.dtsi
> +++ b/arch/arm/boot/dts/imxrt1050.dtsi
> @@ -93,7 +93,6 @@ usdhc1: mmc@...c0000 {
>  			bus-width = <4>;
>  			fsl,wp-controller;
>  			no-1-8-v;
> -			max-frequency = <4000000>;
>  			fsl,tuning-start-tap = <20>;
>  			fsl,tuning-step = <2>;
>  			status = "disabled";
> --
> 2.34.1