From mboxrd@z Thu Jan 1 00:00:00 1970 From: Soren Brinkmann Subject: [PATCH v4 4/4] arm: zynq: Add support for cpufreq Date: Wed, 19 Feb 2014 15:14:44 -0800 Message-ID: <1392851684-29950-5-git-send-email-soren.brinkmann@xilinx.com> References: <1392851684-29950-1-git-send-email-soren.brinkmann@xilinx.com> Return-path: In-Reply-To: <1392851684-29950-1-git-send-email-soren.brinkmann@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org To: Thomas Gleixner , Daniel Lezcano , Michal Simek Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, =?UTF-8?q?S=C3=B6ren=20Brinkmann?= , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Russell King , devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 Cc: Pawel Moll Cc: Mark Rutland Cc: Ian Campbell Cc: Kumar Gala Cc: Russell King Cc: devicetree@vger.kernel.org Signed-off-by: Soren Brinkmann --- v4: - no change v3: - change lowest frequency to 222223 (F_max / 3) --- 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 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) -- 1.9.0.1.g4196000