subject:"\[RESEND 14\/14\] video\: backlight\: mt6370\: Add Mediatek MT6370 support"

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

2022-06-07 Thread Daniel Thompson

On Fri, Jun 03, 2022 at 03:14:56AM +0800, ChiaEn Wu wrote:
> Daniel Thompson  於 2022年6月1日 週三 下午5:46寫道：
> >
> > On Tue, May 31, 2022 at 07:19:00PM +0800, ChiaEn Wu wrote:
> > > +#define MT6370_DT_PROP_DECL(_name, _type, _reg, _mask, _max, _inv)   \
> > > +{\
> > > + .name = "mediatek,bled-" #_name,\
> >
> > I'd rather have the whole DT property in the macro (because it helps
> > with grepability).
> 
> Do you mean the _name parameter must be the full name of the DT
> property and do not use "#" to concat like following example?
> 
> // in declare
> .name = _name,
> // in use
> MT6370_DT_PROP_DECL(mediatek,bled-pwm-enable, ..)

Yes, I would prefer this form, although, as discussed below, I don't really
like MT6370_DT_PROP_DECL().


> > > + .type = MT6370_PARSE_TYPE_##_type,  \
> > > + .reg = _reg,\
> > > + .mask = _mask,  \
> > > + .max_val = _max,\
> > > + .invert = _inv, \
> > > +}
> > > +
> > > +static int mt6370_init_backlight_properties(struct mt6370_priv *priv,
> > > + struct backlight_properties 
> > > *props)
> > > +{
> > > + struct device *dev = priv->dev;
> > > + u8 prop_val;
> > > + u32 brightness;
> > > + unsigned int mask, val;
> > > + static const struct {
> > > + char *name;
> > > + enum mt6370_prop_type type;
> > > + unsigned int reg;
> > > + unsigned int mask;
> > > + u8 max_val;
> > > + bool invert;
> > > + } vendor_opt_props[] = {
> > > + MT6370_DT_PROP_DECL(pwm-enable, BOOL, MT6370_REG_BL_PWM,
> > > + MT6370_BL_PWM_EN_MASK, 1, false),
> > > + MT6370_DT_PROP_DECL(pwm-hys-enable, BOOL, MT6370_REG_BL_PWM,
> > > + MT6370_BL_PWM_HYS_EN_MASK, 1, false),
> > > + MT6370_DT_PROP_DECL(pwm-hys-sel, U8, MT6370_REG_BL_PWM,
> > > + MT6370_BL_PWM_HYS_SEL_MASK, 3, false),
> > > + MT6370_DT_PROP_DECL(ovp-level-sel, U8, 
> > > MT6370_REG_BL_BSTCTRL,
> > > + MT6370_BL_OVP_SEL_MASK, 3, false),
> > > + MT6370_DT_PROP_DECL(ovp-shutdown, BOOL, 
> > > MT6370_REG_BL_BSTCTRL,
> > > + MT6370_BL_OVP_EN_MASK, 1, true),
> > > + MT6370_DT_PROP_DECL(ocp-level-sel, U8, 
> > > MT6370_REG_BL_BSTCTRL,
> > > + MT6370_BL_OC_SEL_MASK, 3, false),
> > > + MT6370_DT_PROP_DECL(ocp-shutdown, BOOL, 
> > > MT6370_REG_BL_BSTCTRL,
> > > + MT6370_BL_OC_EN_MASK, 1, true),
> > > + }, *prop_now;
> > > + int i, ret;
> > > +
> > > + /* vendor optional properties */
> > > + for (i = 0; i < ARRAY_SIZE(vendor_opt_props); i++) {
> > > + prop_now = vendor_opt_props + i;
> > > +
> > > + switch (prop_now->type) {
> > > + case MT6370_PARSE_TYPE_BOOL:
> > > + if (device_property_read_bool(dev, prop_now->name))
> > > + val = 1;
> > > + else
> > > + val = 0;
> > > + break;
> > > + case MT6370_PARSE_TYPE_U8:
> > > + ret = device_property_read_u8(dev, prop_now->name,
> > > +   _val);
> > > + /* Property not exist, keep value in default */
> > > + if (ret)
> > > + continue;
> > > +
> > > + val = min_t(u8, prop_val, prop_now->max_val);
> > > + break;
> > > + default:
> > > + return -EINVAL;
> > > + }
> > > +
> > > + if (prop_now->invert)
> > > + val = prop_now->max_val - val;
> > > +
> > > + val <<= ffs(prop_now->mask) - 1;
> > > +
> > > + ret = regmap_update_bits(priv->regmap, prop_now->reg,
> > > +  prop_now->mask, val);
> > > + if (ret)
> > > + return ret;
> > > + }
> >
> > Is it really worth all this tricky code for 7 properties?
> >
> > The code would be much easier to read and maintain if it were coded
> > directly. For example, the inverted boolean code is hard to read and
> > can be written directly as:
> >
> >
> > val = device_property_read_bool(dev, "mediatek,bled-ovp_shutdown");
> > ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BST_CTRL,
> >  MT6370_BL_OVP_EN_MASK,
> >

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

2022-06-02 Thread ChiaEn Wu

Hi Daniel,

Thanks for your valuable feedback!

Daniel Thompson  於 2022年6月1日 週三 下午5:46寫道：
>
> On Tue, May 31, 2022 at 07:19:00PM +0800, ChiaEn Wu wrote:
> > From: ChiaEn Wu 
> >
> > Add Mediatek MT6370 Backlight support.
> >
> > Signed-off-by: ChiaEn Wu 
> > ---
> >  drivers/video/backlight/Kconfig|   8 +
> >  drivers/video/backlight/Makefile   |   1 +
> >  drivers/video/backlight/mt6370-backlight.c | 338 +
> >  3 files changed, 347 insertions(+)
> >  create mode 100644 drivers/video/backlight/mt6370-backlight.c
> >
> > diff --git a/drivers/video/backlight/Kconfig 
> > b/drivers/video/backlight/Kconfig
> > index a003e02e13ce..d9868fbe7488 100644
> > --- a/drivers/video/backlight/Kconfig
> > +++ b/drivers/video/backlight/Kconfig
> > @@ -268,6 +268,14 @@ config BACKLIGHT_MAX8925
> > If you have a LCD backlight connected to the WLED output of MAX8925
> > WLED output, say Y here to enable this driver.
> >
> > +config BACKLIGHT_MT6370
>
> Is MT6370 really the best name for this driver? In other words, you
> don't expect there to be any family resemblance between this backlight
> and the backlight in the *next* Mediatak PMIC?
>
> Moreover,

MT6370, MT6371, MT6372 are very similar, their hardware design and
features are almost the same and this driver can be compatible with
them.
But, MT6374 is not the same serials PMIC as MT6370, but the name is
very similar. And It has no backlight feature, so I think MT6370 is
the best name for this driver now.

>
>
> > + tristate "Mediatek MT6370 Backlight Driver"
> > + depends on MFD_MT6370
> > + help
> > +   Say Y here to enable MT6370 Backlight support.
> > +   It's commonly used to drive the display WLED. There're 4 channels
> > +   inisde, and each channel can provide up to 30mA current.
>
> Nitpicking but this doesn't align well with other help texts in this
> file.
>

OK! I will try to align well in the next patch.

>
> > +
> >  config BACKLIGHT_APPLE
> >   tristate "Apple Backlight Driver"
> >   depends on X86 && ACPI
> > diff --git a/drivers/video/backlight/Makefile 
> > b/drivers/video/backlight/Makefile
> > index cae2c83422ae..e815f3f1deff 100644
> > --- a/drivers/video/backlight/Makefile
> > +++ b/drivers/video/backlight/Makefile
> > @@ -44,6 +44,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X)  += lp855x_bl.o
> >  obj-$(CONFIG_BACKLIGHT_LP8788)   += lp8788_bl.o
> >  obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o
> >  obj-$(CONFIG_BACKLIGHT_MAX8925)  += max8925_bl.o
> > +obj-$(CONFIG_BACKLIGHT_MT6370)   += mt6370-backlight.o
> >  obj-$(CONFIG_BACKLIGHT_OMAP1)+= omap1_bl.o
> >  obj-$(CONFIG_BACKLIGHT_PANDORA)  += pandora_bl.o
> >  obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
> > diff --git a/drivers/video/backlight/mt6370-backlight.c 
> > b/drivers/video/backlight/mt6370-backlight.c
> > new file mode 100644
> > index ..f8a8d33203ed
> > --- /dev/null
> > +++ b/drivers/video/backlight/mt6370-backlight.c
> > @@ -0,0 +1,338 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +#include 
> > +
> > +#define MT6370_REG_DEV_INFO  0x100
> > +#define MT6370_REG_BL_EN 0x1A0
> > +#define MT6370_REG_BL_BSTCTRL0x1A1
> > +#define MT6370_REG_BL_PWM0x1A2
> > +#define MT6370_REG_BL_DIM2   0x1A4
> > +
> > +#define MT6370_VENID_MASKGENMASK(7, 4)
> > +#define MT6370_BL_EXT_EN_MASKBIT(7)
> > +#define MT6370_BL_EN_MASKBIT(6)
> > +#define MT6370_BL_CONFIG_MASKBIT(0)
> > +#define MT6370_BL_CH_MASKGENMASK(5, 2)
> > +#define MT6370_BL_DIM2_MASK  GENMASK(2, 0)
> > +#define MT6370_BL_DUMMY_6372_MASKGENMASK(2, 0)
> > +#define MT6370_BL_DIM2_6372_SHIFT3
> > +#define MT6370_BL_PWM_EN_MASKBIT(7)
> > +#define MT6370_BL_PWM_HYS_EN_MASKBIT(2)
> > +#define MT6370_BL_PWM_HYS_SEL_MASK   GENMASK(1, 0)
> > +#define MT6370_BL_OVP_EN_MASKBIT(7)
> > +#define MT6370_BL_OVP_SEL_MASK   GENMASK(6, 5)
> > +#define MT6370_BL_OC_EN_MASK BIT(3)
> > +#define MT6370_BL_OC_SEL_MASKGENMASK(2, 1)
> > +
> > +#define MT6370_BL_MAX_BRIGHTNESS 2048
> > +
> > +enum {
> > + MT6370_VID_COMMON = 0,
> > + MT6370_VID_6372,
> > + MT6370_VID_MAX,
>
> Unused.
>
> > +};
> > +
> > +enum mt6370_prop_type {
> > + MT6370_PARSE_TYPE_BOOL = 0,
> > + MT6370_PARSE_TYPE_U8,
> > + MT6370_PARSE_TYPE_MAX,
>
> Unused.
>
> > +};
> > +
> > +struct mt6370_priv {
> > + int vid_type;
> > + struct backlight_device *bl;
> > + struct device *dev;
> > + struct gpio_desc *enable_gpio;
> > + struct regmap *regmap;
> > +};
> > +
> > +static int mt6370_bl_update_status(struct

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

2022-06-01 Thread Daniel Thompson

On Tue, May 31, 2022 at 07:19:00PM +0800, ChiaEn Wu wrote:
> From: ChiaEn Wu 
> 
> Add Mediatek MT6370 Backlight support.
> 
> Signed-off-by: ChiaEn Wu 
> ---
>  drivers/video/backlight/Kconfig|   8 +
>  drivers/video/backlight/Makefile   |   1 +
>  drivers/video/backlight/mt6370-backlight.c | 338 +
>  3 files changed, 347 insertions(+)
>  create mode 100644 drivers/video/backlight/mt6370-backlight.c
> 
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index a003e02e13ce..d9868fbe7488 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -268,6 +268,14 @@ config BACKLIGHT_MAX8925
> If you have a LCD backlight connected to the WLED output of MAX8925
> WLED output, say Y here to enable this driver.
>  
> +config BACKLIGHT_MT6370

Is MT6370 really the best name for this driver? In other words, you
don't expect there to be any family resemblance between this backlight
and the backlight in the *next* Mediatak PMIC?

Moreover, 


> + tristate "Mediatek MT6370 Backlight Driver"
> + depends on MFD_MT6370
> + help
> +   Say Y here to enable MT6370 Backlight support.
> +   It's commonly used to drive the display WLED. There're 4 channels
> +   inisde, and each channel can provide up to 30mA current.

Nitpicking but this doesn't align well with other help texts in this
file.


> +
>  config BACKLIGHT_APPLE
>   tristate "Apple Backlight Driver"
>   depends on X86 && ACPI
> diff --git a/drivers/video/backlight/Makefile 
> b/drivers/video/backlight/Makefile
> index cae2c83422ae..e815f3f1deff 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -44,6 +44,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X)  += lp855x_bl.o
>  obj-$(CONFIG_BACKLIGHT_LP8788)   += lp8788_bl.o
>  obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o
>  obj-$(CONFIG_BACKLIGHT_MAX8925)  += max8925_bl.o
> +obj-$(CONFIG_BACKLIGHT_MT6370)   += mt6370-backlight.o
>  obj-$(CONFIG_BACKLIGHT_OMAP1)+= omap1_bl.o
>  obj-$(CONFIG_BACKLIGHT_PANDORA)  += pandora_bl.o
>  obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
> diff --git a/drivers/video/backlight/mt6370-backlight.c 
> b/drivers/video/backlight/mt6370-backlight.c
> new file mode 100644
> index ..f8a8d33203ed
> --- /dev/null
> +++ b/drivers/video/backlight/mt6370-backlight.c
> @@ -0,0 +1,338 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +#include 
> +
> +#define MT6370_REG_DEV_INFO  0x100
> +#define MT6370_REG_BL_EN 0x1A0
> +#define MT6370_REG_BL_BSTCTRL0x1A1
> +#define MT6370_REG_BL_PWM0x1A2
> +#define MT6370_REG_BL_DIM2   0x1A4
> +
> +#define MT6370_VENID_MASKGENMASK(7, 4)
> +#define MT6370_BL_EXT_EN_MASKBIT(7)
> +#define MT6370_BL_EN_MASKBIT(6)
> +#define MT6370_BL_CONFIG_MASKBIT(0)
> +#define MT6370_BL_CH_MASKGENMASK(5, 2)
> +#define MT6370_BL_DIM2_MASK  GENMASK(2, 0)
> +#define MT6370_BL_DUMMY_6372_MASKGENMASK(2, 0)
> +#define MT6370_BL_DIM2_6372_SHIFT3
> +#define MT6370_BL_PWM_EN_MASKBIT(7)
> +#define MT6370_BL_PWM_HYS_EN_MASKBIT(2)
> +#define MT6370_BL_PWM_HYS_SEL_MASK   GENMASK(1, 0)
> +#define MT6370_BL_OVP_EN_MASKBIT(7)
> +#define MT6370_BL_OVP_SEL_MASK   GENMASK(6, 5)
> +#define MT6370_BL_OC_EN_MASK BIT(3)
> +#define MT6370_BL_OC_SEL_MASKGENMASK(2, 1)
> +
> +#define MT6370_BL_MAX_BRIGHTNESS 2048
> +
> +enum {
> + MT6370_VID_COMMON = 0,
> + MT6370_VID_6372,
> + MT6370_VID_MAX,

Unused.

> +};
> +
> +enum mt6370_prop_type {
> + MT6370_PARSE_TYPE_BOOL = 0,
> + MT6370_PARSE_TYPE_U8,
> + MT6370_PARSE_TYPE_MAX,

Unused.

> +};
> +
> +struct mt6370_priv {
> + int vid_type;
> + struct backlight_device *bl;
> + struct device *dev;
> + struct gpio_desc *enable_gpio;
> + struct regmap *regmap;
> +};
> +
> +static int mt6370_bl_update_status(struct backlight_device *bl_dev)
> +{
> + struct mt6370_priv *priv = bl_get_data(bl_dev);
> + int brightness = backlight_get_brightness(bl_dev);
> + unsigned int enable_val;
> + u8 brightness_val[2];
> + int ret;
> +
> + if (brightness) {
> + brightness_val[0] = (brightness - 1) & MT6370_BL_DIM2_MASK;
> + brightness_val[1] = (brightness - 1)
> + >> fls(MT6370_BL_DIM2_MASK);
> +
> + if (priv->vid_type == MT6370_VID_6372) {
> + brightness_val[0] <<= MT6370_BL_DIM2_6372_SHIFT;
> + brightness_val[0] |= MT6370_BL_DUMMY_6372_MASK;

Comment explaining why we have to set these bits would

[RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

2022-05-31 Thread ChiaEn Wu

From: ChiaEn Wu 

Add Mediatek MT6370 Backlight support.

Signed-off-by: ChiaEn Wu 
---
 drivers/video/backlight/Kconfig|   8 +
 drivers/video/backlight/Makefile   |   1 +
 drivers/video/backlight/mt6370-backlight.c | 338 +
 3 files changed, 347 insertions(+)
 create mode 100644 drivers/video/backlight/mt6370-backlight.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index a003e02e13ce..d9868fbe7488 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -268,6 +268,14 @@ config BACKLIGHT_MAX8925
  If you have a LCD backlight connected to the WLED output of MAX8925
  WLED output, say Y here to enable this driver.
 
+config BACKLIGHT_MT6370
+   tristate "Mediatek MT6370 Backlight Driver"
+   depends on MFD_MT6370
+   help
+ Say Y here to enable MT6370 Backlight support.
+ It's commonly used to drive the display WLED. There're 4 channels
+ inisde, and each channel can provide up to 30mA current.
+
 config BACKLIGHT_APPLE
tristate "Apple Backlight Driver"
depends on X86 && ACPI
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index cae2c83422ae..e815f3f1deff 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X)+= lp855x_bl.o
 obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o
 obj-$(CONFIG_BACKLIGHT_LV5207LP)   += lv5207lp.o
 obj-$(CONFIG_BACKLIGHT_MAX8925)+= max8925_bl.o
+obj-$(CONFIG_BACKLIGHT_MT6370) += mt6370-backlight.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)  += omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA)+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)   += pcf50633-backlight.o
diff --git a/drivers/video/backlight/mt6370-backlight.c 
b/drivers/video/backlight/mt6370-backlight.c
new file mode 100644
index ..f8a8d33203ed
--- /dev/null
+++ b/drivers/video/backlight/mt6370-backlight.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#define MT6370_REG_DEV_INFO0x100
+#define MT6370_REG_BL_EN   0x1A0
+#define MT6370_REG_BL_BSTCTRL  0x1A1
+#define MT6370_REG_BL_PWM  0x1A2
+#define MT6370_REG_BL_DIM2 0x1A4
+
+#define MT6370_VENID_MASK  GENMASK(7, 4)
+#define MT6370_BL_EXT_EN_MASK  BIT(7)
+#define MT6370_BL_EN_MASK  BIT(6)
+#define MT6370_BL_CONFIG_MASK  BIT(0)
+#define MT6370_BL_CH_MASK  GENMASK(5, 2)
+#define MT6370_BL_DIM2_MASKGENMASK(2, 0)
+#define MT6370_BL_DUMMY_6372_MASK  GENMASK(2, 0)
+#define MT6370_BL_DIM2_6372_SHIFT  3
+#define MT6370_BL_PWM_EN_MASK  BIT(7)
+#define MT6370_BL_PWM_HYS_EN_MASK  BIT(2)
+#define MT6370_BL_PWM_HYS_SEL_MASK GENMASK(1, 0)
+#define MT6370_BL_OVP_EN_MASK  BIT(7)
+#define MT6370_BL_OVP_SEL_MASK GENMASK(6, 5)
+#define MT6370_BL_OC_EN_MASK   BIT(3)
+#define MT6370_BL_OC_SEL_MASK  GENMASK(2, 1)
+
+#define MT6370_BL_MAX_BRIGHTNESS   2048
+
+enum {
+   MT6370_VID_COMMON = 0,
+   MT6370_VID_6372,
+   MT6370_VID_MAX,
+};
+
+enum mt6370_prop_type {
+   MT6370_PARSE_TYPE_BOOL = 0,
+   MT6370_PARSE_TYPE_U8,
+   MT6370_PARSE_TYPE_MAX,
+};
+
+struct mt6370_priv {
+   int vid_type;
+   struct backlight_device *bl;
+   struct device *dev;
+   struct gpio_desc *enable_gpio;
+   struct regmap *regmap;
+};
+
+static int mt6370_bl_update_status(struct backlight_device *bl_dev)
+{
+   struct mt6370_priv *priv = bl_get_data(bl_dev);
+   int brightness = backlight_get_brightness(bl_dev);
+   unsigned int enable_val;
+   u8 brightness_val[2];
+   int ret;
+
+   if (brightness) {
+   brightness_val[0] = (brightness - 1) & MT6370_BL_DIM2_MASK;
+   brightness_val[1] = (brightness - 1)
+   >> fls(MT6370_BL_DIM2_MASK);
+
+   if (priv->vid_type == MT6370_VID_6372) {
+   brightness_val[0] <<= MT6370_BL_DIM2_6372_SHIFT;
+   brightness_val[0] |= MT6370_BL_DUMMY_6372_MASK;
+   }
+
+   ret = regmap_raw_write(priv->regmap, MT6370_REG_BL_DIM2,
+  brightness_val, sizeof(brightness_val));
+   if (ret)
+   return ret;
+   }
+
+   if (priv->enable_gpio)
+   gpiod_set_value(priv->enable_gpio, brightness ? 1 : 0);
+
+   enable_val = brightness ? MT6370_BL_EN_MASK : 0;
+   return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN,
+ MT6370_BL_EN_MASK, enable_val);
+}
+
+static int mt6370_bl_get_brightness(struct backlight_device *bl_dev)
+{
+

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

Re: [RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

[RESEND 14/14] video: backlight: mt6370: Add Mediatek MT6370 support

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