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rampis: HLK-RM04 - Setup I2C as GPIO

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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>

SVN-Revision: 48664
This commit is contained in:
John Crispin 2016-02-08 08:26:19 +00:00
parent 480e15f2ce
commit 7f672e66f8
1 changed files with 20 additions and 1 deletions
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21
target/linux/ramips/dts/HLKRM04.dts
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@ -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>;