ARM: shmobile: lager: Add VDD MPU regulator for DVFS

The CA15 cluster is capable of voltage scaling. Add the regulator
in the i2c3 node, to allow the generic CPUFreq driver to use it.

Enable the i2c3 pin mux and the device node as well since the
da9210 is connected to that bus.

Note: In R-CAR Gen2, each frequency is using the same voltage,
and DVS control is not used. Therefore, this patch set the
voltage(Vmin/Vmax) to 1000mv.

Signed-off-by: Benoit Cousson <bcousson@baylibre.com>
[gaku.inami.xw@bp.renesas.com: Changes Vmin for disabling DVS]
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/boot/dts/r8a7790-lager.dts b/arch/arm/boot/dts/r8a7790-lager.dts
index dd2fe46073f2298ba68431625697e669c1ee5ddb..6472cf0914e27298f7b5f5f7283b96daa9375dbb 100644 (file)
--- a/arch/arm/boot/dts/r8a7790-lager.dts
+++ b/arch/arm/boot/dts/r8a7790-lager.dts
@@ -204,6 +204,11 @@
                                 "msiof1_tx";
                renesas,function = "msiof1";
        };
+
+       i2c3_pins: i2c3 {
+               renesas,groups = "i2c3";
+               renesas,function = "i2c3";
+       };
 };
 
 &ether {
@@ -317,3 +322,19 @@
        cd-gpios = <&gpio3 22 GPIO_ACTIVE_LOW>;
        status = "okay";
 };
+
+&i2c3 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&i2c3_pins>;
+       status = "okay";
+
+       vdd_dvfs: regulator@68 {
+               compatible = "diasemi,da9210";
+               reg = <0x68>;
+
+               regulator-min-microvolt = <1000000>;
+               regulator-max-microvolt = <1000000>;
+               regulator-boot-on;
+               regulator-always-on;
+       };
+};