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From: Shawn Guo <shawnguo@kernel.org>
To: Heiko Thiery <heiko.thiery@gmail.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Michael Walle <michael@walle.cc>
Subject: Re: [PATCH v2] arm64: dts: imx8mq-kontron-pitx-imx8m: pass phy reset delays
Date: Mon, 29 Mar 2021 09:51:50 +0800	[thread overview]
Message-ID: <20210329015149.GL22955@dragon> (raw)
In-Reply-To: <20210323140019.14388-1-heiko.thiery@gmail.com>

On Tue, Mar 23, 2021 at 03:00:21PM +0100, Heiko Thiery wrote:
> 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).
> 
> Without these reset delays the board will hang during startup when
> bootargs has ip=dhcp set.
> 
> Fixes: 1dc7f3d79a1a ("arm64: dts: fsl: add support for Kontron pitx-imx8m board")
> Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
> ---
> v2:
>  - add desciption what issue will be fixed
>  - add Fixes tag

My branch is not a stable one, so I just squashed it into the original
commit.

Shawn

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WARNING: multiple messages have this Message-ID (diff)
From: Shawn Guo <shawnguo@kernel.org>
To: Heiko Thiery <heiko.thiery@gmail.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Michael Walle <michael@walle.cc>
Subject: Re: [PATCH v2] arm64: dts: imx8mq-kontron-pitx-imx8m: pass phy reset delays
Date: Mon, 29 Mar 2021 09:51:50 +0800	[thread overview]
Message-ID: <20210329015149.GL22955@dragon> (raw)
In-Reply-To: <20210323140019.14388-1-heiko.thiery@gmail.com>

On Tue, Mar 23, 2021 at 03:00:21PM +0100, Heiko Thiery wrote:
> 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).
> 
> Without these reset delays the board will hang during startup when
> bootargs has ip=dhcp set.
> 
> Fixes: 1dc7f3d79a1a ("arm64: dts: fsl: add support for Kontron pitx-imx8m board")
> Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
> ---
> v2:
>  - add desciption what issue will be fixed
>  - add Fixes tag

My branch is not a stable one, so I just squashed it into the original
commit.

Shawn

  reply	other threads:[~2021-03-29 18:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 14:00 [PATCH v2] arm64: dts: imx8mq-kontron-pitx-imx8m: pass phy reset delays Heiko Thiery
2021-03-23 14:00 ` Heiko Thiery
2021-03-29  1:51 ` Shawn Guo [this message]
2021-03-29  1:51   ` Shawn Guo

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