cpufreq: hisilicon: add acpu driver

Add acpu driver for hisilicon SoC, acpu is application processor
subsystem. Currently the acpu has the coupled clock domain for two
clusters, so this driver will directly use cpufreq-dt driver as
backend.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 1b06fc4640e23c2840cda6011d7c061eedd64a49..4f3dbc8cf7292773d9fcc442edfc8ef695a4a432 100644 (file)
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -108,6 +108,15 @@ config ARM_HIGHBANK_CPUFREQ
 
          If in doubt, say N.
 
+config ARM_HISI_ACPU_CPUFREQ
+       tristate "Hisilicon ACPU CPUfreq driver"
+       depends on ARCH_HISI && CPUFREQ_DT
+       select PM_OPP
+       help
+         This enables the hisilicon ACPU CPUfreq driver.
+
+         If in doubt, say N.
+
 config ARM_IMX6Q_CPUFREQ
        tristate "Freescale i.MX6 cpufreq support"
        depends on ARCH_MXC

diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 26df0ad00e32de3e471bf330530a4e83e6c9492f..cdce92ae2e8b7fdb81e4d25e3ab03ced14e63aac 100644 (file)
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -59,6 +59,7 @@ arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ)   += exynos4x12-cpufreq.o
 arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS5250_CPUFREQ)    += exynos5250-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ)   += exynos5440-cpufreq.o
 obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)     += highbank-cpufreq.o
+obj-$(CONFIG_ARM_HISI_ACPU_CPUFREQ)    += hisi-acpu-cpufreq.o
 obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)                += imx6q-cpufreq.o
 obj-$(CONFIG_ARM_INTEGRATOR)           += integrator-cpufreq.o
 obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ)     += kirkwood-cpufreq.o

diff --git a/drivers/cpufreq/hisi-acpu-cpufreq.c b/drivers/cpufreq/hisi-acpu-cpufreq.c
new file mode 100644 (file)
index 0000000..026d5b2
--- /dev/null
+++ b/drivers/cpufreq/hisi-acpu-cpufreq.c
@@ -0,0 +1,42 @@
+/*
+ * Hisilicon Platforms Using ACPU CPUFreq Support
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ * Copyright (c) 2015 Linaro Limited.
+ *
+ * Leo Yan <leo.yan@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static int __init hisi_acpu_cpufreq_driver_init(void)
+{
+       struct platform_device *pdev;
+
+       if (!of_machine_is_compatible("hisilicon,hi6220"))
+               return -ENODEV;
+
+       pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+       return PTR_ERR_OR_ZERO(pdev);
+}
+module_init(hisi_acpu_cpufreq_driver_init);
+
+MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
+MODULE_DESCRIPTION("Hisilicon acpu cpufreq driver");
+MODULE_LICENSE("GPL v2");