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authorJohn Crispin <blogic@openwrt.org>2016-02-08 08:26:19 +0000
committerJohn Crispin <blogic@openwrt.org>2016-02-08 08:26:19 +0000
commit1f6e645d5fc1bd52c67d9b00c6f25027c42abc00 (patch)
tree897be4f7c6ed8bbcef65d150403fc6f614ac6b3a /target/linux/ramips
parentf43b9e68c13830fe482f82a167f42445cc411c45 (diff)
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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 <inindev@gmail.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48664 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/dts/HLKRM04.dts21
1 files changed, 20 insertions, 1 deletions
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>;