RE: [PATCH 4/5] ARM: dts: imxrt1050: remove mmc max-frequency property
From: Bough Chen <haibo.chen@nxp.com>
Date: 2022-10-18 03:02:01
Also in:
linux-clk, linux-devicetree, linux-mmc, lkml
-----Original Message----- From: Giulio Benetti <giulio.benetti@benettiengineering.com> Sent: 2022年10月18日 7:56 To: devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; linux-clk@vger.kernel.org; linux-mmc@vger.kernel.org Cc: Stephen Boyd <sboyd@kernel.org>; Bough Chen <haibo.chen@nxp.com>; Adrian Hunter [off-list ref]; Ulf Hansson [off-list ref]; Giulio Benetti [off-list ref] 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
quoted hunk ↗ jump to hunk
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@benettiengineering.com> --- arch/arm/boot/dts/imxrt1050.dtsi | 1 - 1 file changed, 1 deletion(-)diff --git a/arch/arm/boot/dts/imxrt1050.dtsib/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@402c0000 { 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
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