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[PATCH 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength

Tim Harvey posted 7 patches 2 weeks, 1 day ago
[PATCH 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength
Posted by Tim Harvey 2 weeks, 1 day ago 
The i.MX8M Mini FEC RGMII tracelength is less than 1in and does not
require a x6 drive strength. Reduce the CLK drive strength to x1 for
better emissions.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
index baf46fe28133..dca213c85cc3 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
@@ -446,7 +446,7 @@ MX8MM_IOMUXC_ENET_RD3_ENET1_RGMII_RD3		0x91
 			MX8MM_IOMUXC_ENET_RD2_ENET1_RGMII_RD2		0x91
 			MX8MM_IOMUXC_ENET_RD1_ENET1_RGMII_RD1		0x91
 			MX8MM_IOMUXC_ENET_RD0_ENET1_RGMII_RD0		0x91
-			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x1f
+			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x0
 			MX8MM_IOMUXC_ENET_RXC_ENET1_RGMII_RXC		0x91
 			MX8MM_IOMUXC_ENET_RX_CTL_ENET1_RGMII_RX_CTL	0x91
 			MX8MM_IOMUXC_ENET_TX_CTL_ENET1_RGMII_TX_CTL	0x1f
-- 
2.25.1
Re: [PATCH 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength
Posted by Peng Fan 2 weeks ago 
On Tue, Sep 16, 2025 at 08:32:13AM -0700, Tim Harvey wrote:
>The i.MX8M Mini FEC RGMII tracelength is less than 1in and does not
>require a x6 drive strength. Reduce the CLK drive strength to x1 for
>better emissions.
>
>Signed-off-by: Tim Harvey <tharvey@gateworks.com>
>---
> arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>index baf46fe28133..dca213c85cc3 100644
>--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>@@ -446,7 +446,7 @@ MX8MM_IOMUXC_ENET_RD3_ENET1_RGMII_RD3		0x91
> 			MX8MM_IOMUXC_ENET_RD2_ENET1_RGMII_RD2		0x91
> 			MX8MM_IOMUXC_ENET_RD1_ENET1_RGMII_RD1		0x91
> 			MX8MM_IOMUXC_ENET_RD0_ENET1_RGMII_RD0		0x91
>-			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x1f
>+			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x0

Same as comment in patch 3

Thanks,
Peng

Patchew 2.1-devel-b67e4c2

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