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Mon, 29 Mar 2021 01:52:19 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id DFEEB61941; Mon, 29 Mar 2021 01:51:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616982715; bh=U0Y5HEp4vLgEt3OrK0G+AlzV4k+/QymqO4rrPYmLDWg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dT20VNVeUoj8H3ChZPXZla+P99WfnHv8Mnzy2scGz5waqBEfSy+U6dS4xFIjkgZBv mUtVCce8MHgk0yjq23piVjgyicmtuPZhWZBPQU+0UyD3C1l4BksxhkKYY7yOk2+L4n t0d+A2RlrWVAr2yH8iSFLpN2iv0r690Fe/0D2Me2tAwcFV2JqyaB0RNp7JlOxr+yXP vpKN5E9MmoNk0HuUbft0UATSY1FhXAO6qfGe7KH+OhGREhjgJvTkHGXMBBjl6Bq9Dw wv4dLzGz03UVgAsdM0kgklMdjqhMEPo1k80R9W+AAejxvYsO2f5zOI2wpwX5BQKzCK 1xOBcDX50CuTQ== Date: Mon, 29 Mar 2021 09:51:50 +0800 From: Shawn Guo To: Heiko Thiery Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rob Herring , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Michael Walle Subject: Re: [PATCH v2] arm64: dts: imx8mq-kontron-pitx-imx8m: pass phy reset delays Message-ID: <20210329015149.GL22955@dragon> References: <20210323140019.14388-1-heiko.thiery@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210323140019.14388-1-heiko.thiery@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210329_025217_058900_6A148B8A X-CRM114-Status: GOOD ( 10.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 > --- > 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel