diff mbox series

[OpenWrt-Devel,1/2] ath79: GL-AR300M series: Add I2C Support

Message ID 20191023165502.25906-1-lede@allycomm.com
State Accepted
Delegated to: John Crispin
Headers show
Series [OpenWrt-Devel,1/2] ath79: GL-AR300M series: Add I2C Support | expand

Commit Message

Jeff Kletsky Oct. 23, 2019, 4:55 p.m. UTC 
From: Jeff Kletsky <git-commits@allycomm.com>

The GL-AR300M series have an internal header for I2C.

Provide DTS definitions for the i2c-gpio driver.

The I2C drivers; kmod-i2c-core, kmod-i2c-gpio
consume ~20 kB of flash and can be loaded as modules,

Default clock measured ~11.4 ms period, ~88 kHz

The board has two sets of (unpopulated) headers.  While facing the
back of the board (looking into the Ethernet jacks), and looking from
the top, the one on the left edge of the baord with four holes is the
I2C header. It appears to be labeled J8 on "GL-AR300M-V1.4.0" boards.

    | (Patch antenna)
    |
    |
    |  O   GND
    |  O   SDA / GPIO 17
    |  O   SCL / GPIO 16
    |  ⊡   3V3 (square land)
    |
    | (Ethernet jacks)

https://docs.gl-inet.com/en/3/hardware/ar300m/#pcb-pinout states
"Note: I2C is not working in some early version of the router."

Signed-off-by: Jeff Kletsky <git-commits@allycomm.com>
---
 target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi b/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi
index 267f2f478f..b72aa65522 100644
--- a/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi
+++ b/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi
@@ -60,6 +60,13 @@ 
 			linux,default-trigger = "phy0tpt";
 		};
 	};
+
+	i2c: i2c {
+		compatible = "i2c-gpio";
+
+		sda-gpios = <&gpio 17 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio 16 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+	};
 };
 
 &pcie0 {