[PATCH 1/7] arm64: dts: imx8mm-venice-gw700x: Increase HS400 USDHC clock speed

[PATCH 1/7] arm64: dts: imx8mm-venice-gw700x: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: 6f30b27c5ef5 ("arm64: dts: imx8mm: Add Gateworks i.MX 8M Mini Development Kits")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
index 5a3b1142ddf4..37db4f0dd505 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
@@ -418,6 +418,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 2/7] arm64: dts: imx8mp-venice-gw702x: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8mp-venice boards.

Fixes: 0d5b288c2110 ("arm64: dts: freescale: Add imx8mp-venice-gw7905-2x")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi
index 10713c34ff39..cbf0c9a740fa 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi
@@ -434,6 +434,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MP_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 3/7] arm64: dts: imx8mm-venice-gw7901: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: 2b1649a83afc ("arm64: dts: imx: Add i.mx8mm Gateworks gw7901 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
index d8b67e12f7d7..272c2b223d16 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
@@ -833,6 +833,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 4/7] arm64: dts: imx8mm-venice-gw7902: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: ef484dfcf6f7 ("arm64: dts: imx: Add i.mx8mm/imx8mn Gateworks gw7902 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts
index 46d1ee0a4ee8..c09b40fc6dec 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts
@@ -743,6 +743,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 5/7] arm64: dts: imx8mn-venice-gw7902: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: ef484dfcf6f7 ("arm64: dts: imx: Add i.mx8mm/imx8mn Gateworks gw7902 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts b/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts
index 30c286b34aa5..a5f52f60169e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts
@@ -693,6 +693,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MN_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 6/7] arm64: dts: imx8mm-venice-gw7903: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: a72ba91e5bc7 ("arm64: dts: imx: Add i.mx8mm Gateworks gw7903 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw7903.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7903.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7903.dts
index c0aadff4e25b..636daa3d6ca2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7903.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7903.dts
@@ -621,6 +621,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

[PATCH 7/7] arm64: dts: imx8mm-venice-gw7904: Increase HS400 USDHC clock speed

[Tim Harvey]

The IMX8M reference manuals indicate in the USDHC Clock generator
section
that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
clocked at 200Mhz require a 400Mhz SDHC clock.

This showed about a 1.5x improvement in read performance for the eMMC's
used on the various imx8m{m,n,p}-venice boards.

Fixes: b999bdaf0597 ("arm64: dts: imx: Add i.mx8mm Gateworks gw7904 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
index 86a610de84fe..99572961d9e1 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
@@ -682,6 +682,8 @@ &usdhc3 {
 	pinctrl-0 = <&pinctrl_usdhc3>;
 	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
 	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	non-removable;
 	status = "okay";
-- 
2.25.1

Re: [PATCH 1/7] arm64: dts: imx8mm-venice-gw700x: Increase HS400 USDHC clock speed

[Shawn Guo]

On Mon, Jul 07, 2025 at 01:16:56PM -0700, Tim Harvey wrote:
> The IMX8M reference manuals indicate in the USDHC Clock generator section
> that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
> clocked at 200Mhz require a 400Mhz SDHC clock.
> 
> This showed about a 1.5x improvement in read performance for the eMMC's
> used on the various imx8m{m,n,p}-venice boards.
> 
> Fixes: 6f30b27c5ef5 ("arm64: dts: imx8mm: Add Gateworks i.MX 8M Mini Development Kits")
> Signed-off-by: Tim Harvey <tharvey@gateworks.com>

Applied all, thanks!