[PATCH] cpufreq: rockchip: add driver

From: Feng Xiao
Date: Fri Mar 18 2016 - 08:14:54 EST


This driver will directly use cpufreq-dt driver as backend.

As there is not a generic devicetree board file(rockchip.c)
on ARM64 architecture, so remove platform_device_register_simple
in rockchip.c and add a new cpufreq driver to support for all
Rockchip SoCs.

Signed-off-by: Feng Xiao <xf@xxxxxxxxxxxxxx>
---
arch/arm/mach-rockchip/rockchip.c | 1 -
drivers/cpufreq/Kconfig.arm | 10 ++++++++++
drivers/cpufreq/Makefile | 1 +
drivers/cpufreq/rockchip-cpufreq.c | 36 ++++++++++++++++++++++++++++++++++++
4 files changed, 47 insertions(+), 1 deletion(-)
create mode 100644 drivers/cpufreq/rockchip-cpufreq.c

diff --git a/arch/arm/mach-rockchip/rockchip.c b/arch/arm/mach-rockchip/rockchip.c
index 3f07cc5..beb71da 100644
--- a/arch/arm/mach-rockchip/rockchip.c
+++ b/arch/arm/mach-rockchip/rockchip.c
@@ -74,7 +74,6 @@ static void __init rockchip_dt_init(void)
{
rockchip_suspend_init();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
- platform_device_register_simple("cpufreq-dt", 0, NULL, 0);
}

static const char * const rockchip_board_dt_compat[] = {
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 14b1f93..1786315 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -97,6 +97,16 @@ config ARM_OMAP2PLUS_CPUFREQ
depends on ARCH_OMAP2PLUS
default ARCH_OMAP2PLUS

+config ARM_ROCKCHIP_CPUFREQ
+ tristate "Rockchip CPUfreq driver"
+ depends on ARCH_ROCKCHIP && CPUFREQ_DT
+ select PM_OPP
+ help
+ This adds the CPUFreq driver support for Rockchip SoCs.
+ The driver will directly use cpufreq-dt driver as backend.
+
+ If in doubt, say N.
+
config ARM_S3C_CPUFREQ
bool
help
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 9e63fb1..91d8bb7 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_ARM_MT8173_CPUFREQ) += mt8173-cpufreq.o
obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o
obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
+obj-$(CONFIG_ARM_ROCKCHIP_CPUFREQ) += rockchip-cpufreq.o
obj-$(CONFIG_ARM_S3C24XX_CPUFREQ) += s3c24xx-cpufreq.o
obj-$(CONFIG_ARM_S3C24XX_CPUFREQ_DEBUGFS) += s3c24xx-cpufreq-debugfs.o
obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o
diff --git a/drivers/cpufreq/rockchip-cpufreq.c b/drivers/cpufreq/rockchip-cpufreq.c
new file mode 100644
index 0000000..ecbadcd
--- /dev/null
+++ b/drivers/cpufreq/rockchip-cpufreq.c
@@ -0,0 +1,36 @@
+/*
+ * Rockchip Platforms CPUFreq Support
+ *
+ * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Feng Xiao <xf@xxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#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 rockchip_cpufreq_driver_init(void)
+{
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+ return PTR_ERR_OR_ZERO(pdev);
+}
+module_init(rockchip_cpufreq_driver_init);
+
+MODULE_AUTHOR("Feng Xiao <xf@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Rockchip cpufreq driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1