diff options
| author | Simon Horman <horms+renesas@verge.net.au> | 2016-11-06 21:20:30 +0100 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2016-11-23 20:52:23 +0100 |
| commit | e60a19f03cdb5a16fdad72d0776a1ede10fd2a57 (patch) | |
| tree | 7153cc6d923ac966d4c9e7f08e36ad8a2fdbf3b3 /arch/arm/boot/dts/r8a7794-alt.dts | |
| parent | 6723438b3b98ba8434655fa13fc6d5153f70ee98 (diff) | |
ARM: dts: alt: use demuxer for I2C4
Make it possible to fallback to GPIO for I2C4 on the EXIO-B connector.
This is based on reference work for the I2C0 core of the lager/r8a7790
by Wolfram Sang.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Diffstat (limited to 'arch/arm/boot/dts/r8a7794-alt.dts')
| -rw-r--r-- | arch/arm/boot/dts/r8a7794-alt.dts | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/r8a7794-alt.dts b/arch/arm/boot/dts/r8a7794-alt.dts index a3e74684289b..7270d4224b1a 100644 --- a/arch/arm/boot/dts/r8a7794-alt.dts +++ b/arch/arm/boot/dts/r8a7794-alt.dts @@ -18,6 +18,8 @@ aliases { serial0 = &scif2; + i2c10 = &gpioi2c4; + i2c12 = &i2cexio4; }; chosen { @@ -135,6 +137,29 @@ #clock-cells = <0>; clock-frequency = <148500000>; }; + + gpioi2c4: i2c-10 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "i2c-gpio"; + status = "disabled"; + gpios = <&gpio4 9 GPIO_ACTIVE_HIGH /* sda */ + &gpio4 8 GPIO_ACTIVE_HIGH /* scl */ + >; + i2c-gpio,delay-us = <5>; + }; + + /* + * I2C4 is routed to EXIO connector B, pins 73 (SCL) + 74 (SDA). + * A fallback to GPIO is provided. + */ + i2cexio4: i2c-14 { + compatible = "i2c-demux-pinctrl"; + i2c-parent = <&i2c4>, <&gpioi2c4>; + i2c-bus-name = "i2c-exio4"; + #address-cells = <1>; + #size-cells = <0>; + }; }; &du { @@ -194,6 +219,11 @@ function = "i2c1"; }; + i2c4_pins: i2c4 { + groups = "i2c4"; + function = "i2c4"; + }; + vin0_pins: vin0 { groups = "vin0_data8", "vin0_clk"; function = "vin0"; @@ -314,6 +344,11 @@ }; }; +&i2c4 { + pinctrl-0 = <&i2c4_pins>; + pinctrl-names = "i2c-exio4"; +}; + &vin0 { status = "okay"; pinctrl-0 = <&vin0_pins>; |