The Lager board uses a DA9210 voltage regulator to supply DVFS power to the
CA15 cores on the r8a7790 SoC. This patch adds CPUFreq support for that
board using the cpufreq-cpu0 driver.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+rene...@gmail.com>
---
This patch is marked as RFC, because so far I don't have data about r8a7790
valid OPPs. The Lager system boots with 1.3GHz, supplying 1.0V to SoC's
DVFS. Apart from that I don't have information what voltage is required for
other clock frequencies. Here I'm using a "safe guess" of 0.95V for 700MHz,
but we might either wait with this patch until exact data is available, or
actually commit these values - this can be decided.
arch/arm/boot/dts/r8a7790-lager-reference.dts | 32 ++++++++++++++++++++++++
arch/arm/mach-shmobile/board-lager-reference.c | 4 ++-
2 files changed, 35 insertions(+), 1 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7790-lager-reference.dts
b/arch/arm/boot/dts/r8a7790-lager-reference.dts
index c462ef1..7a41419 100644
--- a/arch/arm/boot/dts/r8a7790-lager-reference.dts
+++ b/arch/arm/boot/dts/r8a7790-lager-reference.dts
@@ -43,3 +43,35 @@
};
};
};
+
+&i2c3 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c3_pins>;
+
+ vdd_dvfs: da9210@68 {
+ compatible = "diasemi,da9210";
+ reg = <0x68>;
+
+ regulator-min-microvolt = <900000>;
+ regulator-max-microvolt = <1000000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+};
+
+&cpu0 {
+ cpu0-supply = <&vdd_dvfs>;
+ operating-points = <
+ /* kHz uV - OPs unknown yet */
+ 1300000 1000000
+ 700000 950000
+ >;
+ voltage-tolerance = <1>; /* 1% */
+};
+
+&pfc {
+ i2c3_pins: i2c3 {
+ renesas,groups = "i2c3";
+ renesas,function = "i2c3";
+ };
+};
diff --git a/arch/arm/mach-shmobile/board-lager-reference.c
b/arch/arm/mach-shmobile/board-lager-reference.c
index 9c316a1..442d854 100644
--- a/arch/arm/mach-shmobile/board-lager-reference.c
+++ b/arch/arm/mach-shmobile/board-lager-reference.c
@@ -20,6 +20,7 @@
#include <linux/init.h>
#include <linux/of_platform.h>
+#include <linux/platform_device.h>
#include <mach/r8a7790.h>
#include <asm/mach/arch.h>
@@ -29,7 +30,8 @@ static void __init lager_add_standard_devices(void)
r8a7790_clock_init();
r8a7790_add_dt_devices();
- of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ platform_device_register_simple("cpufreq-cpu0", -1, NULL, 0);
}
static const char *lager_boards_compat_dt[] __initdata = {
--
1.7.2.5
--
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