ARM: dts: gose: use demuxer for I2C4

Make it possible to fallback to GPIO for I2C4 on the EXIO-E 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, corrected board name in subject, fixed aliases, switched
to named GPIOs, fixed pinmux for I2C4]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

diff --git a/arch/arm/boot/dts/r8a7793-gose.dts b/arch/arm/boot/dts/r8a7793-gose.dts
index 2b330ef71f4c17b53455153affb84d7e19e1590e..9ed6961f2d9a2c4a1a671980f3c336f5d137cc7d 100644 (file)
--- a/arch/arm/boot/dts/r8a7793-gose.dts
+++ b/arch/arm/boot/dts/r8a7793-gose.dts
@@ -49,7 +49,9 @@
                serial0 = &scif0;
                serial1 = &scif1;
                i2c9 = &gpioi2c2;
+               i2c10 = &gpioi2c4;
                i2c11 = &i2chdmi;
+               i2c12 = &i2cexio4;
        };
 
        chosen {
@@ -309,6 +311,16 @@
                i2c-gpio,delay-us = <5>;
        };
 
+       gpioi2c4: i2c-10 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "i2c-gpio";
+               status = "disabled";
+               scl-gpios = <&gpio7 13 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+               sda-gpios = <&gpio7 14 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+               i2c-gpio,delay-us = <5>;
+       };
+
        /*
         * A fallback to GPIO is provided for I2C2.
         */
@@ -416,6 +428,18 @@
                        pagesize = <16>;
                };
        };
+
+       /*
+        * I2C4 is routed to EXIO connector E, pins 37 (SCL) + 39 (SDA).
+        * A fallback to GPIO is provided.
+        */
+       i2cexio4: i2c-12 {
+               compatible = "i2c-demux-pinctrl";
+               i2c-parent = <&i2c4>, <&gpioi2c4>;
+               i2c-bus-name = "i2c-exio4";
+               #address-cells = <1>;
+               #size-cells = <0>;
+       };
 };
 
 &du {
@@ -454,6 +478,11 @@
                function = "i2c2";
        };
 
+       i2c4_pins: i2c4 {
+               groups = "i2c4_c";
+               function = "i2c4";
+       };
+
        du_pins: du {
                groups = "du_rgb888", "du_sync", "du_disp", "du_clk_out_0";
                function = "du";
@@ -692,6 +721,11 @@
        };
 };
 
+&i2c4 {
+       pinctrl-0 = <&i2c4_pins>;
+       pinctrl-names = "i2c-exio4";
+};
+
 &rcar_sound {
        pinctrl-0 = <&sound_pins &sound_clk_pins>;
        pinctrl-names = "default";