From: Christoph Niedermaier <cniedermaier@dh-electronics.com>
To: <linux-arm-kernel@lists.infradead.org>
Cc: Christoph Niedermaier <cniedermaier@dh-electronics.com>,
Shawn Guo <shawnguo@kernel.org>, Fabio Estevam <festevam@denx.de>,
Marek Vasut <marex@denx.de>, NXP Linux Team <linux-imx@nxp.com>,
<kernel@dh-electronics.com>
Subject: [PATCH] ARM: dts: imx6qdl-dhcom: Align PHY reset timing with other DHCOM SoMs
Date: Wed, 8 Dec 2021 16:05:43 +0100 [thread overview]
Message-ID: <20211208150543.10643-1-cniedermaier@dh-electronics.com> (raw)
According to datasheet Microchip LAN8710A/LAN8710Ai DS00002164B [1]
the reset should stay asserted for at least 100uS and software
should wait at least 200nS. On other DHCOM SoMs with the SMSC
LAN8710Ai PHY both reset delays are 500us. This should be plenty
and for consistency, the i.MX6 SoM should also use these delays.
[1] https://ww1.microchip.com/downloads/en/DeviceDoc/00002164B.pdf
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: kernel@dh-electronics.com
To: linux-arm-kernel@lists.infradead.org
---
arch/arm/boot/dts/imx6qdl-dhcom-som.dtsi | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/imx6qdl-dhcom-som.dtsi b/arch/arm/boot/dts/imx6qdl-dhcom-som.dtsi
index 5d10c40313cb..e71687061161 100644
--- a/arch/arm/boot/dts/imx6qdl-dhcom-som.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-dhcom-som.dtsi
@@ -138,8 +138,8 @@
pinctrl-0 = <&pinctrl_ethphy0>;
pinctrl-names = "default";
reg = <0>;
- reset-assert-us = <1000>;
- reset-deassert-us = <1000>;
+ reset-assert-us = <500>;
+ reset-deassert-us = <500>;
reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
smsc,disable-energy-detect; /* Make plugin detection reliable */
};
--
2.11.0
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next reply other threads:[~2021-12-08 15:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-08 15:05 Christoph Niedermaier [this message]
2021-12-08 17:36 ` [PATCH] ARM: dts: imx6qdl-dhcom: Align PHY reset timing with other DHCOM SoMs Fabio Estevam
2021-12-14 8:30 ` Shawn Guo
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