ARM: shmobile: sh73a0: add CPUFreq support

This patch enables the use of the generic cpufreq-cpu0 driver on sh73a0.
Providing a regulator, a list of OPPs in DT, combined with a virtual
cpufreq-cpu0 platform device and a clock, attached to it is everything,
the cpufreq-cpu0 driver needs. The first sh73a0 platform, implementing
such CPUFreq support is kzm9g-reference.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 52e8c6e..f871f2a 100644 (file)
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -169,6 +169,8 @@ config MACH_KZM9D
 config MACH_KZM9G
        bool "KZM-A9-GT board"
        depends on ARCH_SH73A0
+       select ARCH_HAS_CPUFREQ
+       select ARCH_HAS_OPP
        select ARCH_REQUIRE_GPIOLIB
        select REGULATOR_FIXED_VOLTAGE if REGULATOR
        select SND_SOC_AK4642 if SND_SIMPLE_CARD

diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
index 3bc33a5..3acb45a 100644 (file)
--- a/arch/arm/mach-shmobile/setup-sh73a0.c
+++ b/arch/arm/mach-shmobile/setup-sh73a0.c
@@ -963,6 +963,8 @@ static const struct of_dev_auxdata sh73a0_auxdata_lookup[] __initconst = {
 
 void __init sh73a0_add_standard_devices_dt(void)
 {
+       struct platform_device_info devinfo = { .name = "cpufreq-cpu0", .id = -1, };
+
        /* clocks are setup late during boot in the case of DT */
        sh73a0_clock_init();
 
@@ -970,6 +972,9 @@ void __init sh73a0_add_standard_devices_dt(void)
                             ARRAY_SIZE(sh73a0_devices_dt));
        of_platform_populate(NULL, of_default_bus_match_table,
                             sh73a0_auxdata_lookup, NULL);
+
+       /* Instantiate cpufreq-cpu0 */
+       platform_device_register_full(&devinfo);
 }
 
 static const char *sh73a0_boards_compat_dt[] __initdata = {