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Mon, 13 May 2019 07:03:04 -0700 (PDT) From: Fabio Estevam To: shawnguo@kernel.org Subject: [PATCH] arm64: dts: imx8mq-zii-ultra: Operate I2C at 100kHz Date: Mon, 13 May 2019 11:02:59 -0300 Message-Id: <20190513140259.17525-1-festevam@gmail.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190513_070306_377849_9998F8A9 X-CRM114-Status: GOOD ( 13.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, cphealy@gmail.com, Fabio Estevam , linux-imx@nxp.com, kernel@pengutronix.de MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org According to the i.MX8M errata document [1], there is an I2C spec violation when the I2C clock frequency is 400 kHz: "e7805: I2C: When the I2C clock speed is configured for 400 kHz, the SCL low period violates the I2C spec of 1.3 uS min" Avoid this problem by running I2C at 100 kHz instead. [1] https://www.nxp.com/docs/en/errata/IMX8MDQLQ_1N14W.pdf Signed-off-by: Fabio Estevam --- arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi index 7a1706f969f0..8603fb1a78d0 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi @@ -253,14 +253,14 @@ }; &i2c1 { - clock-frequency = <400000>; + clock-frequency = <100000>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_i2c1>; status = "okay"; }; &i2c2 { - clock-frequency = <400000>; + clock-frequency = <100000>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_i2c2>; status = "okay"; @@ -376,7 +376,7 @@ }; &i2c4 { - clock-frequency = <400000>; + clock-frequency = <100000>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_i2c4>; status = "okay"; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel