ARM: shmobile: ape6evm-reference: add CPUFreq support

Add CPUFreq support to ape6evm-reference, using a max8973 regulator, that
is supplying V_DVFS for the 4 CA15 cores on r8a73a4.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

2 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts b/arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts
index 3251f059c25b..6f4506e737ac 100644
--- a/arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts
+++ b/arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts
@@ -31,3 +31,25 @@
                 ranges = <0 0 0 0x80000000>;
         };
 };
+
+&i2c5 {
+        vdd_dvfs: max8973@1b {
+                compatible = "maxim,max8973";
+                reg = <0x1b>;
+
+                regulator-min-microvolt = <935000>;
+                regulator-max-microvolt = <1200000>;
+                regulator-boot-on;
+                regulator-always-on;
+        };
+};
+
+&cpu0 {
+        cpu0-supply = <&vdd_dvfs>;
+        operating-points = <
+                /* kHz  uV */
+                1950000 1115000
+                1462500  995000
+        >;
+        voltage-tolerance = <1>; /* 1% */
+};
diff --git a/arch/arm/mach-shmobile/board-ape6evm-reference.c b/arch/arm/mach-shmobile/board-ape6evm-reference.c
index c828874947ba..46b41dec6345 100644
--- a/arch/arm/mach-shmobile/board-ape6evm-reference.c
+++ b/arch/arm/mach-shmobile/board-ape6evm-reference.c
@@ -22,6 +22,7 @@
 #include <linux/kernel.h>
 #include <linux/of_platform.h>
 #include <linux/pinctrl/machine.h>
+#include <linux/platform_device.h>
 #include <linux/sh_clk.h>
 #include <mach/common.h>
 #include <mach/r8a73a4.h>
@@ -56,6 +57,7 @@ static void __init ape6evm_add_standard_devices(void)
         r8a73a4_pinmux_init();
         r8a73a4_add_dt_devices();
         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+        platform_device_register_simple("cpufreq-cpu0", -1, NULL, 0);
 }
 
 static const char *ape6evm_boards_compat_dt[] __initdata = {