linux-kernel - [PATCH 03/11] arm64: dts: imx93: assign usdhc[1..3] root clock to 400MHz

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Date: Tue, 16 Apr 2024 23:26:39 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Peng Fan <peng.fan@....com>, Haibo Chen <haibo.chen@....com>, 
 Sherry Sun <sherry.sun@....com>
Subject: [PATCH 03/11] arm64: dts: imx93: assign usdhc[1..3] root clock to
 400MHz

From: Haibo Chen <haibo.chen@....com>

1. Config SDHC1 clock 400MHz to support eMMC HS400ES mode
2. The original usdhc2 and usdhc3 root clock is 200MHz. Then WIFI
on usdhc3 at SDR104 mode can work under 200MHz. But if imx93 work
under Low Drive mode, the usdhc3 pad signal is not good under 200MHz,
SDR104 mode can't work stable. Need to downgrade to 133MHz to let
WIFI work stable. To cover all the cases, for Norminal Drive mode,
keep usdhc root at 400MHz, then card(SD/wifi) can work at SDR104 mode
under 200MHz to get the best performance. For Low Drive mode,
bootloader need override usdhc root clock to 266MHz, and the
card(SD/wifi) work at SDR104 mode under 133MHz, can work stable.

Reviewed-by: Sherry Sun <sherry.sun@....com>
Signed-off-by: Haibo Chen <haibo.chen@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 arch/arm64/boot/dts/freescale/imx93.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93.dtsi b/arch/arm64/boot/dts/freescale/imx93.dtsi
index 00f2526c4011..1c5e2049a37a 100644
--- a/arch/arm64/boot/dts/freescale/imx93.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93.dtsi
@@ -1017,6 +1017,9 @@ usdhc1: mmc@...50000 {
 					 <&clk IMX93_CLK_WAKEUP_AXI>,
 					 <&clk IMX93_CLK_USDHC1_GATE>;
 				clock-names = "ipg", "ahb", "per";
+				assigned-clocks = <&clk IMX93_CLK_USDHC1>;
+				assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1>;
+				assigned-clock-rates = <400000000>;
 				bus-width = <8>;
 				fsl,tuning-start-tap = <1>;
 				fsl,tuning-step = <2>;
@@ -1031,6 +1034,9 @@ usdhc2: mmc@...60000 {
 					 <&clk IMX93_CLK_WAKEUP_AXI>,
 					 <&clk IMX93_CLK_USDHC2_GATE>;
 				clock-names = "ipg", "ahb", "per";
+				assigned-clocks = <&clk IMX93_CLK_USDHC2>;
+				assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1>;
+				assigned-clock-rates = <400000000>;
 				bus-width = <4>;
 				fsl,tuning-start-tap = <1>;
 				fsl,tuning-step = <2>;
@@ -1094,6 +1100,9 @@ usdhc3: mmc@...b0000 {
 					 <&clk IMX93_CLK_WAKEUP_AXI>,
 					 <&clk IMX93_CLK_USDHC3_GATE>;
 				clock-names = "ipg", "ahb", "per";
+				assigned-clocks = <&clk IMX93_CLK_USDHC3>;
+				assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1>;
+				assigned-clock-rates = <400000000>;
 				bus-width = <4>;
 				fsl,tuning-start-tap = <1>;
 				fsl,tuning-step = <2>;

-- 
2.37.1