linux-kernel - [PATCH V2 6/6] arm64: dts: imx8ulp: increase the clock speed of LPSPI

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Message-Id: <20220831142552.43393-7-peng.fan@oss.nxp.com>
Date:   Wed, 31 Aug 2022 22:25:52 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        aisheng.dong@....com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Clark Wang <xiaoning.wang@....com>,
        Haibo Chen <haibo.chen@....com>, Jun Li <jun.li@....com>,
        Peng Fan <peng.fan@....com>
Subject: [PATCH V2 6/6] arm64: dts: imx8ulp: increase the clock speed of LPSPI

From: Clark Wang <xiaoning.wang@....com>

LPSPI transfer max speed is half of the root clock.
Increase the root clock speed to support faster data transmission.

And update the parent clock of all i2c/spi with IMX8ULP_CLK_FROSC_DIV2
which could produce accurate clock for i2c/spi usage.

Reviewed-by: Haibo Chen <haibo.chen@....com>
Reviewed-by: Jun Li <jun.li@....com>
Signed-off-by: Clark Wang <xiaoning.wang@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
index d95c0e9b15d6..06ce5f19aa8a 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
@@ -224,7 +224,7 @@ lpi2c4: i2c@...70000 {
 					 <&pcc3 IMX8ULP_CLK_LPI2C4>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc3 IMX8ULP_CLK_LPI2C4>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
 				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
@@ -237,7 +237,7 @@ lpi2c5: i2c@...80000 {
 					 <&pcc3 IMX8ULP_CLK_LPI2C5>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc3 IMX8ULP_CLK_LPI2C5>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
 				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
@@ -270,8 +270,8 @@ lpspi4: spi@...b0000 {
 					 <&pcc3 IMX8ULP_CLK_LPSPI4>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc3 IMX8ULP_CLK_LPSPI4>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
-				assigned-clock-rates = <16000000>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
+				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
 
@@ -285,8 +285,8 @@ lpspi5: spi@...c0000 {
 					 <&pcc3 IMX8ULP_CLK_LPSPI5>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc3 IMX8ULP_CLK_LPSPI5>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
-				assigned-clock-rates = <16000000>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
+				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
 		};
@@ -313,7 +313,7 @@ lpi2c6: i2c@...40000 {
 					 <&pcc4 IMX8ULP_CLK_LPI2C6>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc4 IMX8ULP_CLK_LPI2C6>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
 				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
@@ -326,7 +326,7 @@ lpi2c7: i2c@...50000 {
 					 <&pcc4 IMX8ULP_CLK_LPI2C7>;
 				clock-names = "per", "ipg";
 				assigned-clocks = <&pcc4 IMX8ULP_CLK_LPI2C7>;
-				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>;
+				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_FROSC_DIV2>;
 				assigned-clock-rates = <48000000>;
 				status = "disabled";
 			};
-- 
2.37.1