[v2,9/9] arm: zynq: Add support for cpufreq

Commit Message

Soren Brinkmann Nov. 27, 2013, 1:04 a.m. UTC

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 <[e-mail]>
---
 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(+)

Patch

diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
index 23ba82c205a2..dc030481ee64 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
+				111112  1000000
+			>;
 		};
 
 		cpu@1 {
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index f84fab14f0b7..f03e75bd0b2b 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 9a7bd137c8fd..eeff33a1d14a 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -54,6 +54,8 @@  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
 	 */
@@ -62,6 +64,7 @@  static void __init zynq_init_machine(void)
 	of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
 
 	platform_device_register(&zynq_cpuidle_device);
+	platform_device_register_full(&devinfo);
 }
 
 static void __init zynq_timer_init(void)