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ARM: shmobile: ape6evm-reference: add CPUFreq support

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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>
This commit is contained in:
Guennadi Liakhovetski 2013-07-08 18:04:58 +02:00 committed by Simon Horman
parent 69f366615e
commit b88cf6f732
2 changed files with 24 additions and 0 deletions
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22
arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts
View file

@ -31,3 +31,25 @@ lbsc {
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% */
};

2
arch/arm/mach-shmobile/board-ape6evm-reference.c
View file

@ -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 = {