From 1c3389e6cb99d36196df322dd40aa73cd06f983b Mon Sep 17 00:00:00 2001 From: Marcel Ziswiler Date: Sat, 10 Feb 2018 02:36:36 +0100 Subject: ARM: tegra: Fix I2C bus frequencies on Apalis/Colibri Use a faster speed of 400 kbit/s for regular I2C busses. Use a slower speed of 10 kbit/s for DDC/EDID to improve reliability. Use a slower speed of 100 kbit/s for power I2C to be within specs of the LM95245 temperature sensor. While at it further annotate I2C pin usage. Signed-off-by: Marcel Ziswiler Signed-off-by: Thierry Reding --- arch/arm/boot/dts/tegra20-colibri-512.dtsi | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'arch/arm/boot/dts/tegra20-colibri-512.dtsi') diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi b/arch/arm/boot/dts/tegra20-colibri-512.dtsi index 813ae34edd6a..5c202b3e3bb1 100644 --- a/arch/arm/boot/dts/tegra20-colibri-512.dtsi +++ b/arch/arm/boot/dts/tegra20-colibri-512.dtsi @@ -213,21 +213,27 @@ GPIO_ACTIVE_HIGH>; }; + /* + * GEN1_I2C: I2C_SDA/SCL on SODIMM pin 194/196 (e.g. RTC on carrier + * board) + */ i2c@7000c000 { clock-frequency = <400000>; }; + /* DDC_SCL/SDA on X3 pin 15/16 (e.g. display EDID) */ i2c_ddc: i2c@7000c400 { - clock-frequency = <100000>; + clock-frequency = <10000>; }; - i2c@7000c500 { - clock-frequency = <400000>; - }; + /* GEN2_I2C: unused */ + /* CAM/GEN3_I2C: used as EXT_IO1/2 GPIOs on SODIMM pin 133/127 */ + + /* PWR_I2C: power I2C to PMIC and temperature sensor (On-module) */ i2c@7000d000 { status = "okay"; - clock-frequency = <400000>; + clock-frequency = <100000>; pmic: tps6586x@34 { compatible = "ti,tps6586x"; -- cgit v1.2.3