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ath79: GL-AR300M series: Add I2C Support

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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>
This commit is contained in:
Jeff Kletsky 2019-10-23 09:55:01 -07:00 committed by John Crispin
parent 7c5f712e4f
commit 736d16baad
1 changed files with 7 additions and 0 deletions
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7
target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi
View File

@ -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 {