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Subject[PATCH 7/7] arm: zynq: Add support for cpufreq
Date
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.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
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 37fc04525142..aca41ca6de1d 100644
--- a/arch/arm/boot/dts/zynq-7000.dtsi
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -28,6 +28,12 @@
i-cache-line-size = <0x20>;
d-cache-size = <0x8000>;
d-cache-line-size = <0x20>;
+ operating-points = <
+ /* kHz uV */
+ 666667 1000000
+ 333334 1000000
+ 111112 1000000
+ >;
};

cpu@1 {
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 04f8a4a6e755..8b943f19107d 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 5f252569c689..20b373fe855a 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -50,12 +50,15 @@ static struct of_device_id zynq_of_bus_ids[] __initdata = {
*/
static void __init zynq_init_machine(void)
{
+ struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
+
/*
* 64KB way size, 8-way associativity, parity disabled
*/
l2x0_of_init(0x02060000, 0xF0F0FFFF);

of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
+ platform_device_register_full(&devinfo);
}

static void __init zynq_timer_init(void)
--
1.8.4.2


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