On Mon, Jun 29, 2015 at 11:03 PM, YH Huang <yh.huang@xxxxxxxxxxxx> wrote: > Add display PWM driver support to modify backlight for MT8173 and MT6595. > The PWM has one channel to control the brightness of the display. > When the (high_width / period) is closer to 1, the screen is brighter; otherwise, it is darker. > > Change-Id: Ie85b295e2dddd90b4163af1c906df977f79b59d6 > Signed-off-by: YH Huang <yh.huang@xxxxxxxxxxxx> > --- > drivers/pwm/Kconfig | 10 ++ > drivers/pwm/Makefile | 1 + > drivers/pwm/pwm-mtk-disp.c | 256 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 267 insertions(+) > create mode 100644 drivers/pwm/pwm-mtk-disp.c > > diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig > index b1541f4..90e3c079 100644 > --- a/drivers/pwm/Kconfig > +++ b/drivers/pwm/Kconfig > @@ -211,6 +211,16 @@ config PWM_LPSS_PLATFORM > To compile this driver as a module, choose M here: the module > will be called pwm-lpss-platform. > > +config PWM_MTK_DISP > + tristate "MediaTek display PWM driver" > + depends on HAS_IOMEM depends on ARCH_MEDIATEK || COMPILE_TEST > + help > + Generic PWM framework driver for MediaTek disp-pwm device. > + The PWM is used to control the backlight brightness for display. > + > + To compile this driver as a module, choose M here: the module > + will be called pwm-mtk-disp. > + > config PWM_MXS > tristate "Freescale MXS PWM support" > depends on ARCH_MXS && OF > diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile > index ec50eb5..99c9e75 100644 > --- a/drivers/pwm/Makefile > +++ b/drivers/pwm/Makefile > @@ -18,6 +18,7 @@ obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o > obj-$(CONFIG_PWM_LPSS) += pwm-lpss.o > obj-$(CONFIG_PWM_LPSS_PCI) += pwm-lpss-pci.o > obj-$(CONFIG_PWM_LPSS_PLATFORM) += pwm-lpss-platform.o > +obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o > obj-$(CONFIG_PWM_MXS) += pwm-mxs.o > obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o > obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o > diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c > new file mode 100644 > index 0000000..fb3a42e > --- /dev/null > +++ b/drivers/pwm/pwm-mtk-disp.c > @@ -0,0 +1,256 @@ > +/* > + * MediaTek display pulse-width-modulation controller driver. > + * Copyright (c) 2015 MediaTek Inc. > + * Author: YH Huang <yh.huang@xxxxxxxxxxxx> > + * > + * 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 in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <linux/clk.h> > +#include <linux/err.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/pwm.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > + > +#define DISP_PWM_EN 0x0 > +#define PWM_ENABLE_MASK 0x1 For one bit fields like this, it is nicer to use: BIT() Thanks! -Dan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
