* [PATCH] arm64: dts: imx8mq-kontron-pitx-imx8m: pass phy reset delays
@ 2021-03-22 21:24 Heiko Thiery
0 siblings, 0 replies; only message in thread
From: Heiko Thiery @ 2021-03-22 21:24 UTC (permalink / raw)
To: devicetree, linux-arm-kernel, linux-kernel
Cc: Rob Herring, Shawn Guo, Sascha Hauer, Pengutronix Kernel Team,
Fabio Estevam, NXP Linux Team, heiko.thiery, michael
The TI DP83867 PHY datasheet says:
T1: Post RESET stabilization time == 195us
T3: Hardware configuration pins transition to output drivers == 64us
T4: RESET pulse width == 1us
So with a little overhead set 'reset-assert-us' to 10us (T4) and
'reset-deassert-us' to 280us (T1+T3).
Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
---
arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts b/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
index 91a9ceb10305..f593e4ff62e1 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-kontron-pitx-imx8m.dts
@@ -90,6 +90,8 @@ ethphy0: ethernet-phy@0 {
ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_75_NS>;
ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
reset-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
+ reset-assert-us = <10>;
+ reset-deassert-us = <280>;
};
};
};
--
2.30.0
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