The I2C function of the RT5350 SoC on the HLK-RM04 is used for GPIO1 and GPIO2.
Take note that the I2C_SD pin is GPIO1 on the RT5350 and is exposed on the HLK-RM04 as GPIO0 Likewise the I2C_SCLK pin is GPIO2 on the RT5350 and is exposed on the HLK-RM04 as GPIO1 group mode 1 mode 2 hlk-rm04 pin & export i2c i2c_sd gpio1 (pin 8, hlk-rm04:gpio0) i2c i2c_sclk gpio2 (pin 9, hlk-rm04:gpio1) reference: http://www.hlktech.net/product_detail.php?ProId=39 http://cdn.sparkfun.com/datasheets/Wireless/WiFi/RT5350.pdf Signed-off-by: John Clark <[email protected]> --- target/linux/ramips/dts/HLKRM04.dts | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/target/linux/ramips/dts/HLKRM04.dts b/target/linux/ramips/dts/HLKRM04.dts index 5f43642..713b51f 100644 --- a/target/linux/ramips/dts/HLKRM04.dts +++ b/target/linux/ramips/dts/HLKRM04.dts @@ -60,7 +60,7 @@ pinctrl { state_default: pinctrl0 { gpio { - ralink,group = "jtag"; + ralink,group = "i2c", "jtag"; ralink,function = "gpio"; }; }; @@ -82,6 +82,25 @@ status = "okay"; }; + gpio-export { + compatible = "gpio-export"; + #size-cells = <0>; + + /* I2C */ + gpio1 { + /* I2C_I2C_SD */ + gpio-export,name = "hlk-rm04:gpio0"; + gpio-export,direction_may_change = <1>; + gpios = <&gpio0 1 0>; + }; + gpio2 { + /* I2C_I2C_SCLK */ + gpio-export,name = "hlk-rm04:gpio1"; + gpio-export,direction_may_change = <1>; + gpios = <&gpio0 2 0>; + }; + }; + gpio-keys-polled { compatible = "gpio-keys-polled"; #address-cells = <1>; -- 2.4.3 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
