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@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: devicetree@vger.kernel.org
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>

3 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
index 8b67b19392ec..789d0bacc110 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 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 1db2a5ca9ab8..644468151c04 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)