From 1f6e645d5fc1bd52c67d9b00c6f25027c42abc00 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Mon, 8 Feb 2016 08:26:19 +0000 Subject: rampis: HLK-RM04 - Setup I2C as GPIO 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 git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48664 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- target/linux/ramips/dts/HLKRM04.dts | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) (limited to 'target/linux/ramips') diff --git a/target/linux/ramips/dts/HLKRM04.dts b/target/linux/ramips/dts/HLKRM04.dts index 5f43642c12..713b51f29b 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>; -- cgit v1.2.3