superrob1500
/
mirror-linux
mirror of https://github.com/torvalds/linux
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

arm64: dts: imx8mp-skov: use I2C5 for DDC 

The HDMI DDC pads can be muxed either to an i.MX I2C controller or
to a limited I2C controller within the Designware HDMI bridge.

So far, the pads were muxed to the HDMI bridge, but the i.MX I2C controller
is the better choice:

  - The Designware HDMI I2C controller doesn't support multi-byte
    requests and the Linux driver refuses[1] transfers to/from address
    0x37, but these are required for display/brightness configuration,

  - The driver doesn't support I2C bus recovery, but some HDMI panels used
    with the board can be flaky and require it.

As the i.MX I2C controller and driver don't have either of these
limitations, let's make use of it instead.

[1]: https://lore.kernel.org/all/20190722181945.244395-1-mka@chromium.org/

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
pull/1188/head
Ahmad Fatoum 2025-01-06 17:06:38 +01:00 committed by Shawn Guo
parent 3d8ffe5702
commit 68e008f256
1 changed files with 24 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/arm64/boot/dts/freescale/imx8mp-skov-revb-hdmi.dts
View File

@ -9,12 +9,34 @@
compatible = "skov,imx8mp-skov-revb-hdmi", "fsl,imx8mp";
};
&i2c5 {
pinctrl-names = "default", "gpio";
pinctrl-0 = <&pinctrl_i2c5>;
pinctrl-1 = <&pinctrl_i2c5_gpio>;
scl-gpios = <&gpio3 26 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
sda-gpios = <&gpio3 27 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
clock-frequency = <100000>;
status = "okay";
};
&iomuxc {
pinctrl_hdmi: hdmigrp {
fsl,pins = <
MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0x1c3
MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0x1c3
MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x19
>;
};
pinctrl_i2c5: i2c5grp {
fsl,pins = <
MX8MP_IOMUXC_HDMI_DDC_SCL__I2C5_SCL 0x400001c2
MX8MP_IOMUXC_HDMI_DDC_SDA__I2C5_SDA 0x400001c2
>;
};
pinctrl_i2c5_gpio: i2c5gpiogrp {
fsl,pins = <
MX8MP_IOMUXC_HDMI_DDC_SCL__GPIO3_IO26 0x400001c2
MX8MP_IOMUXC_HDMI_DDC_SDA__GPIO3_IO27 0x400001c2
>;
};
};