The A83T has 3 I2C controllers under the standard bus. There is one more in the R_ block section. The pin functions for the 3 controllers are on PH 0~6. I2C2 can also be used on pins PE14 and PE15, but these pins can also mux the CSI (camera sensor interface) controller's embedded I2C controller. The latter seems to be preferred in the reference designs for I2C camera sensor access, freeing I2C2 for other uses.
This patch adds device nodes for the three standard I2C controllers, as well as pinmux settings for the PH pins. For I2C0 and I2C1, since they only have one possible setting, just set them by default.
Signed-off-by: Chen-Yu Tsai wens@csie.org --- arch/arm/boot/dts/sun8i-a83t.dtsi | 52 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+)
diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi index 354cb4b48f47..b8c5f0a2c463 100644 --- a/arch/arm/boot/dts/sun8i-a83t.dtsi +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi @@ -348,6 +348,21 @@ drive-strength = <40>; };
+ i2c0_pins: i2c0-pins { + pins = "PH0", "PH1"; + function = "i2c0"; + }; + + i2c1_pins: i2c1-pins { + pins = "PH2", "PH3"; + function = "i2c1"; + }; + + i2c2_ph_pins: i2c2-ph-pins { + pins = "PH4", "PH5"; + function = "i2c2"; + }; + i2s1_pins: i2s1-pins { /* I2S1 does not have external MCLK pin */ pins = "PG10", "PG11", "PG12", "PG13"; @@ -499,6 +514,43 @@ status = "disabled"; };
+ i2c0: i2c@1c2ac00 { + compatible = "allwinner,sun6i-a31-i2c"; + reg = <0x01c2ac00 0x400>; + interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&ccu CLK_BUS_I2C0>; + resets = <&ccu RST_BUS_I2C0>; + pinctrl-names = "default"; + pinctrl-0 = <&i2c0_pins>; + status = "disabled"; + #address-cells = <1>; + #size-cells = <0>; + }; + + i2c1: i2c@1c2b000 { + compatible = "allwinner,sun6i-a31-i2c"; + reg = <0x01c2b000 0x400>; + interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&ccu CLK_BUS_I2C1>; + resets = <&ccu RST_BUS_I2C1>; + pinctrl-names = "default"; + pinctrl-0 = <&i2c1_pins>; + status = "disabled"; + #address-cells = <1>; + #size-cells = <0>; + }; + + i2c2: i2c@1c2b400 { + compatible = "allwinner,sun6i-a31-i2c"; + reg = <0x01c2b400 0x400>; + interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&ccu CLK_BUS_I2C2>; + resets = <&ccu RST_BUS_I2C2>; + status = "disabled"; + #address-cells = <1>; + #size-cells = <0>; + }; + emac: ethernet@1c30000 { compatible = "allwinner,sun8i-a83t-emac"; syscon = <&syscon>;