Commit-ID: cd325295871fbd172340a73f323f6a19c0b0525d
Gitweb: http://git.kernel.org/tip/cd325295871fbd172340a73f323f6a19c0b0525d
Author: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx>
AuthorDate: Wed, 19 Feb 2014 15:14:44 -0800
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Tue, 11 Mar 2014 23:10:28 +0100
arm: zynq: Add support for cpufreq
The generic cpufreq-cpu0 driver can scale the CPU frequency on Zynq
SOCs. Add the required platform device to the BSP and appropriate
OPPs to the dts.
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Pawel Moll <pawel.moll@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
Cc: Kumar Gala <galak@xxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Acked-by: Michal Simek <michal.simek@xxxxxxxxxx>
---
arch/arm/boot/dts/zynq-7000.dtsi | 6 ++++++
arch/arm/mach-zynq/Kconfig | 2 ++
arch/arm/mach-zynq/common.c | 3 +++
3 files changed, 11 insertions(+)
diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
index 8b67b19..789d0ba 100644
--- a/arch/arm/boot/dts/zynq-7000.dtsi
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -24,6 +24,12 @@
device_type = "cpu";
reg = <0>;
clocks = <&clkc 3>;
+ operating-points = <
+ /* kHz uV */
+ 666667 1000000
+ 333334 1000000
+ 222223 1000000
+ >;
};
cpu@1 {
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index f84fab1..f03e75b 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -2,6 +2,8 @@ config ARCH_ZYNQ
bool "Xilinx Zynq ARM Cortex A9 Platform" if ARCH_MULTI_V7
select ARM_AMBA
select ARM_GIC
+ select ARCH_HAS_CPUFREQ
+ select ARCH_HAS_OPP
select COMMON_CLK
select CPU_V7
select GENERIC_CLOCKEVENTS
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index 1db2a5ca..6444681 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -51,6 +51,8 @@ static struct platform_device zynq_cpuidle_device = {
*/
static void __init zynq_init_machine(void)
{
+ struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
+
/*
* 64KB way size, 8-way associativity, parity disabled
*/
@@ -59,6 +61,7 @@ static void __init zynq_init_machine(void)
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
platform_device_register(&zynq_cpuidle_device);
+ platform_device_register_full(&devinfo);
}
static void __init zynq_timer_init(void)
--
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