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ath79: GL-AR750S: Add I2C Support

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The GL-AR750S has 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 ~11.2 ms period, ~89 kHz

The board has well-labeled (unpopulated) headers for serial and I2C
along the front edge of the board (the edge with the LEDs). Looking
from the top, rear of the unit (behind Ethernet jacks)

  -------------------------------------------
       5G_LED        2G_LED      PWR_LED

                 O O O O O O O

                 3 S S G T R G
                 V C D N X X N
                 3 L A D     D

Signed-off-by: Jeff Kletsky <git-commits@allycomm.com>
This commit is contained in:
Jeff Kletsky
2019-10-23 09:55:02 -07:00
committed by John Crispin
parent 736d16baad
commit 1f748df085
1 changed files with 7 additions and 0 deletions
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7
target/linux/ath79/dts/qca9563_glinet_gl-ar750s.dts
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@@ -63,6 +63,13 @@
};
};
i2c: i2c {
compatible = "i2c-gpio";
sda-gpios = <&gpio 5 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&gpio 21 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
};
usb_vbus: regulator-usb-vbus {
compatible = "regulator-fixed";