ARM: dts: imx: Set default tuning step for imx7d usdhc

If the tuning step is not set, the tuning step is set to 1.
For some sd cards, the following Tuning timeout will occur.

Tuning failed, falling back to fixed sampling clock
mmc0: Tuning failed, falling back to fixed sampling clock

So set the default tuning step. This refers to the NXP vendor's
commit below:

https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/
arch/arm/boot/dts/imx7s.dtsi#L1216-L1217

Fixes: 1e336aa0c025 ("mmc: sdhci-esdhc-imx: correct the tuning start tap and step setting")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/nxp/imx/imx7s.dtsi b/arch/arm/boot/dts/nxp/imx/imx7s.dtsi
index 54026c2c93fac8593140e42517b46edb3b1a476f..6ffb428dc939c25a0db97f6da45b7f477e90af0e 100644 (file)
--- a/arch/arm/boot/dts/nxp/imx/imx7s.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx7s.dtsi
@@ -1184,6 +1184,8 @@
                                        <&clks IMX7D_USDHC1_ROOT_CLK>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-step = <2>;
+                               fsl,tuning-start-tap = <20>;
                                status = "disabled";
                        };
 
@@ -1196,6 +1198,8 @@
                                        <&clks IMX7D_USDHC2_ROOT_CLK>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-step = <2>;
+                               fsl,tuning-start-tap = <20>;
                                status = "disabled";
                        };
 
@@ -1208,6 +1212,8 @@
                                        <&clks IMX7D_USDHC3_ROOT_CLK>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-step = <2>;
+                               fsl,tuning-start-tap = <20>;
                                status = "disabled";
                        };