| Message ID | 1619421491-31494-1-git-send-email-u0084500@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [RESEND,v6,1/4] mfd: rt4831: Adds support for Richtek RT4831 | expand |
On Mon, Apr 26, 2021 at 03:18:11PM +0800, cy_huang wrote: > From: ChiYuan Huang <cy_huang@richtek.com> > > Adds support for Richtek RT4831 backlight. > > Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> > --- > Resend this v6 patch series to loop devicetree reviewers. > > For next, if the typo in Kconfig 'common' to 'commonly' can be added the below line > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> > --- This isn't the best way to handle feedback from multiple maintainers. It is great to see you are keeping track of feedback. However it doesn't make sense to RESEND an old patchset and acknowledge that you haven't fixed a typo yet. It would be better to fix the typo and to resend a v7. Daniel. > drivers/video/backlight/Kconfig | 8 ++ > drivers/video/backlight/Makefile | 1 + > drivers/video/backlight/rt4831-backlight.c | 203 +++++++++++++++++++++++++++++ > 3 files changed, 212 insertions(+) > create mode 100644 drivers/video/backlight/rt4831-backlight.c > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > index d83c87b..de96441 100644 > --- a/drivers/video/backlight/Kconfig > +++ b/drivers/video/backlight/Kconfig > @@ -289,6 +289,14 @@ config BACKLIGHT_QCOM_WLED > If you have the Qualcomm PMIC, say Y to enable a driver for the > WLED block. Currently it supports PM8941 and PMI8998. > > +config BACKLIGHT_RT4831 > + tristate "Richtek RT4831 Backlight Driver" > + depends on MFD_RT4831 > + help > + This enables support for Richtek RT4831 Backlight driver. > + It's common used to drive the display WLED. There're four channels > + inisde, and each channel can provide up to 30mA current. > + > config BACKLIGHT_SAHARA > tristate "Tabletkiosk Sahara Touch-iT Backlight Driver" > depends on X86 > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > index 685f3f1..cae2c83 100644 > --- a/drivers/video/backlight/Makefile > +++ b/drivers/video/backlight/Makefile > @@ -49,6 +49,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o > obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o > obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o > obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o > +obj-$(CONFIG_BACKLIGHT_RT4831) += rt4831-backlight.o > obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o > obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > diff --git a/drivers/video/backlight/rt4831-backlight.c b/drivers/video/backlight/rt4831-backlight.c > new file mode 100644 > index 00000000..42155c7 > --- /dev/null > +++ b/drivers/video/backlight/rt4831-backlight.c > @@ -0,0 +1,203 @@ > +// SPDX-License-Identifier: GPL-2.0-only > + > +#include <dt-bindings/leds/rt4831-backlight.h> > +#include <linux/backlight.h> > +#include <linux/bitops.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > + > +#define RT4831_REG_BLCFG 0x02 > +#define RT4831_REG_BLDIML 0x04 > +#define RT4831_REG_ENABLE 0x08 > + > +#define RT4831_BLMAX_BRIGHTNESS 2048 > + > +#define RT4831_BLOVP_MASK GENMASK(7, 5) > +#define RT4831_BLOVP_SHIFT 5 > +#define RT4831_BLPWMEN_MASK BIT(0) > +#define RT4831_BLEN_MASK BIT(4) > +#define RT4831_BLCH_MASK GENMASK(3, 0) > +#define RT4831_BLDIML_MASK GENMASK(2, 0) > +#define RT4831_BLDIMH_MASK GENMASK(10, 3) > +#define RT4831_BLDIMH_SHIFT 3 > + > +struct rt4831_priv { > + struct device *dev; > + struct regmap *regmap; > + struct backlight_device *bl; > +}; > + > +static int rt4831_bl_update_status(struct backlight_device *bl_dev) > +{ > + struct rt4831_priv *priv = bl_get_data(bl_dev); > + int brightness = backlight_get_brightness(bl_dev); > + unsigned int enable = brightness ? RT4831_BLEN_MASK : 0; > + u8 v[2]; > + int ret; > + > + if (brightness) { > + v[0] = (brightness - 1) & RT4831_BLDIML_MASK; > + v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT; > + > + ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v)); > + if (ret) > + return ret; > + } > + > + return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable); > + > +} > + > +static int rt4831_bl_get_brightness(struct backlight_device *bl_dev) > +{ > + struct rt4831_priv *priv = bl_get_data(bl_dev); > + unsigned int val; > + u8 v[2]; > + int ret; > + > + ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val); > + if (ret) > + return ret; > + > + if (!(val & RT4831_BLEN_MASK)) > + return 0; > + > + ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v)); > + if (ret) > + return ret; > + > + ret = (v[1] << RT4831_BLDIMH_SHIFT) + (v[0] & RT4831_BLDIML_MASK) + 1; > + > + return ret; > +} > + > +static const struct backlight_ops rt4831_bl_ops = { > + .options = BL_CORE_SUSPENDRESUME, > + .update_status = rt4831_bl_update_status, > + .get_brightness = rt4831_bl_get_brightness, > +}; > + > +static int rt4831_parse_backlight_properties(struct rt4831_priv *priv, > + struct backlight_properties *bl_props) > +{ > + struct device *dev = priv->dev; > + u8 propval; > + u32 brightness; > + unsigned int val = 0; > + int ret; > + > + /* common properties */ > + ret = device_property_read_u32(dev, "max-brightness", &brightness); > + if (ret) > + brightness = RT4831_BLMAX_BRIGHTNESS; > + > + bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS); > + > + ret = device_property_read_u32(dev, "default-brightness", &brightness); > + if (ret) > + brightness = bl_props->max_brightness; > + > + bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness); > + > + /* vendor properties */ > + if (device_property_read_bool(dev, "richtek,pwm-enable")) > + val = RT4831_BLPWMEN_MASK; > + > + ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val); > + if (ret) > + return ret; > + > + ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval); > + if (ret) > + propval = RT4831_BLOVPLVL_21V; > + > + propval = min_t(u8, propval, RT4831_BLOVPLVL_29V); > + ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK, > + propval << RT4831_BLOVP_SHIFT); > + if (ret) > + return ret; > + > + ret = device_property_read_u8(dev, "richtek,channel-use", &propval); > + if (ret) { > + dev_err(dev, "richtek,channel-use DT property missing\n"); > + return ret; > + } > + > + if (!(propval & RT4831_BLCH_MASK)) { > + dev_err(dev, "No channel specified\n"); > + return -EINVAL; > + } > + > + return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval); > +} > + > +static int rt4831_bl_probe(struct platform_device *pdev) > +{ > + struct rt4831_priv *priv; > + struct backlight_properties bl_props = { .type = BACKLIGHT_RAW, > + .scale = BACKLIGHT_SCALE_LINEAR }; > + int ret; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->dev = &pdev->dev; > + > + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!priv->regmap) { > + dev_err(&pdev->dev, "Failed to init regmap\n"); > + return -ENODEV; > + } > + > + ret = rt4831_parse_backlight_properties(priv, &bl_props); > + if (ret) { > + dev_err(&pdev->dev, "Failed to parse backlight properties\n"); > + return ret; > + } > + > + priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv, > + &rt4831_bl_ops, &bl_props); > + if (IS_ERR(priv->bl)) { > + dev_err(&pdev->dev, "Failed to register backlight\n"); > + return PTR_ERR(priv->bl); > + } > + > + backlight_update_status(priv->bl); > + platform_set_drvdata(pdev, priv); > + > + return 0; > +} > + > +static int rt4831_bl_remove(struct platform_device *pdev) > +{ > + struct rt4831_priv *priv = platform_get_drvdata(pdev); > + struct backlight_device *bl_dev = priv->bl; > + > + bl_dev->props.brightness = 0; > + backlight_update_status(priv->bl); > + > + return 0; > +} > + > +static const struct of_device_id __maybe_unused rt4831_bl_of_match[] = { > + { .compatible = "richtek,rt4831-backlight", }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, rt4831_bl_of_match); > + > +static struct platform_driver rt4831_bl_driver = { > + .driver = { > + .name = "rt4831-backlight", > + .of_match_table = rt4831_bl_of_match, > + }, > + .probe = rt4831_bl_probe, > + .remove = rt4831_bl_remove, > +}; > +module_platform_driver(rt4831_bl_driver); > + > +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); > +MODULE_LICENSE("GPL v2"); > -- > 2.7.4 >
On Mon, Apr 26, 2021 at 06:50:15PM +0800, ChiYuan Huang wrote: > Hi, > > Daniel Thompson <daniel.thompson@linaro.org> 於 2021年4月26日 週一 下午6:19寫道： > > > > On Mon, Apr 26, 2021 at 03:18:11PM +0800, cy_huang wrote: > > > From: ChiYuan Huang <cy_huang@richtek.com> > > > > > > Adds support for Richtek RT4831 backlight. > > > > > > Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> > > > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> > > > --- > > > Resend this v6 patch series to loop devicetree reviewers. > > > > > > For next, if the typo in Kconfig 'common' to 'commonly' can be added the below line > > > Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> > > > --- > > > > This isn't the best way to handle feedback from multiple maintainers. > > > > It is great to see you are keeping track of feedback. However it doesn't > > make sense to RESEND an old patchset and acknowledge that you haven't > > fixed a typo yet. > > > > It would be better to fix the typo and to resend a v7. > > You can refer to the below reply > https://lkml.org/lkml/2021/4/23/229 Indeed. However that thread is ambiguous about resending with changes (PATCH v7) and resending without changes (PATCH RESEND v6). Given you said in March there was a v7 series coming, I think it would have been better to send a new version. Don't worry about this too much. This is turning into quite a lot of fuss for a two letter typo. However it's very unusual to send out a patch (except perhaps an RFC) together with a comment listing what you need to fix next time around. It is pretty much always better to fix it first and then send it. Daniel. > > > drivers/video/backlight/Kconfig | 8 ++ > > > drivers/video/backlight/Makefile | 1 + > > > drivers/video/backlight/rt4831-backlight.c | 203 +++++++++++++++++++++++++++++ > > > 3 files changed, 212 insertions(+) > > > create mode 100644 drivers/video/backlight/rt4831-backlight.c > > > > > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > > > index d83c87b..de96441 100644 > > > --- a/drivers/video/backlight/Kconfig > > > +++ b/drivers/video/backlight/Kconfig > > > @@ -289,6 +289,14 @@ config BACKLIGHT_QCOM_WLED > > > If you have the Qualcomm PMIC, say Y to enable a driver for the > > > WLED block. Currently it supports PM8941 and PMI8998. > > > > > > +config BACKLIGHT_RT4831 > > > + tristate "Richtek RT4831 Backlight Driver" > > > + depends on MFD_RT4831 > > > + help > > > + This enables support for Richtek RT4831 Backlight driver. > > > + It's common used to drive the display WLED. There're four channels > > > + inisde, and each channel can provide up to 30mA current. > > > + > > > config BACKLIGHT_SAHARA > > > tristate "Tabletkiosk Sahara Touch-iT Backlight Driver" > > > depends on X86 > > > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > > > index 685f3f1..cae2c83 100644 > > > --- a/drivers/video/backlight/Makefile > > > +++ b/drivers/video/backlight/Makefile > > > @@ -49,6 +49,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o > > > obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o > > > obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o > > > obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o > > > +obj-$(CONFIG_BACKLIGHT_RT4831) += rt4831-backlight.o > > > obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o > > > obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > > > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > > > diff --git a/drivers/video/backlight/rt4831-backlight.c b/drivers/video/backlight/rt4831-backlight.c > > > new file mode 100644 > > > index 00000000..42155c7 > > > --- /dev/null > > > +++ b/drivers/video/backlight/rt4831-backlight.c > > > @@ -0,0 +1,203 @@ > > > +// SPDX-License-Identifier: GPL-2.0-only > > > + > > > +#include <dt-bindings/leds/rt4831-backlight.h> > > > +#include <linux/backlight.h> > > > +#include <linux/bitops.h> > > > +#include <linux/kernel.h> > > > +#include <linux/module.h> > > > +#include <linux/platform_device.h> > > > +#include <linux/property.h> > > > +#include <linux/regmap.h> > > > + > > > +#define RT4831_REG_BLCFG 0x02 > > > +#define RT4831_REG_BLDIML 0x04 > > > +#define RT4831_REG_ENABLE 0x08 > > > + > > > +#define RT4831_BLMAX_BRIGHTNESS 2048 > > > + > > > +#define RT4831_BLOVP_MASK GENMASK(7, 5) > > > +#define RT4831_BLOVP_SHIFT 5 > > > +#define RT4831_BLPWMEN_MASK BIT(0) > > > +#define RT4831_BLEN_MASK BIT(4) > > > +#define RT4831_BLCH_MASK GENMASK(3, 0) > > > +#define RT4831_BLDIML_MASK GENMASK(2, 0) > > > +#define RT4831_BLDIMH_MASK GENMASK(10, 3) > > > +#define RT4831_BLDIMH_SHIFT 3 > > > + > > > +struct rt4831_priv { > > > + struct device *dev; > > > + struct regmap *regmap; > > > + struct backlight_device *bl; > > > +}; > > > + > > > +static int rt4831_bl_update_status(struct backlight_device *bl_dev) > > > +{ > > > + struct rt4831_priv *priv = bl_get_data(bl_dev); > > > + int brightness = backlight_get_brightness(bl_dev); > > > + unsigned int enable = brightness ? RT4831_BLEN_MASK : 0; > > > + u8 v[2]; > > > + int ret; > > > + > > > + if (brightness) { > > > + v[0] = (brightness - 1) & RT4831_BLDIML_MASK; > > > + v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT; > > > + > > > + ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v)); > > > + if (ret) > > > + return ret; > > > + } > > > + > > > + return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable); > > > + > > > +} > > > + > > > +static int rt4831_bl_get_brightness(struct backlight_device *bl_dev) > > > +{ > > > + struct rt4831_priv *priv = bl_get_data(bl_dev); > > > + unsigned int val; > > > + u8 v[2]; > > > + int ret; > > > + > > > + ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val); > > > + if (ret) > > > + return ret; > > > + > > > + if (!(val & RT4831_BLEN_MASK)) > > > + return 0; > > > + > > > + ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v)); > > > + if (ret) > > > + return ret; > > > + > > > + ret = (v[1] << RT4831_BLDIMH_SHIFT) + (v[0] & RT4831_BLDIML_MASK) + 1; > > > + > > > + return ret; > > > +} > > > + > > > +static const struct backlight_ops rt4831_bl_ops = { > > > + .options = BL_CORE_SUSPENDRESUME, > > > + .update_status = rt4831_bl_update_status, > > > + .get_brightness = rt4831_bl_get_brightness, > > > +}; > > > + > > > +static int rt4831_parse_backlight_properties(struct rt4831_priv *priv, > > > + struct backlight_properties *bl_props) > > > +{ > > > + struct device *dev = priv->dev; > > > + u8 propval; > > > + u32 brightness; > > > + unsigned int val = 0; > > > + int ret; > > > + > > > + /* common properties */ > > > + ret = device_property_read_u32(dev, "max-brightness", &brightness); > > > + if (ret) > > > + brightness = RT4831_BLMAX_BRIGHTNESS; > > > + > > > + bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS); > > > + > > > + ret = device_property_read_u32(dev, "default-brightness", &brightness); > > > + if (ret) > > > + brightness = bl_props->max_brightness; > > > + > > > + bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness); > > > + > > > + /* vendor properties */ > > > + if (device_property_read_bool(dev, "richtek,pwm-enable")) > > > + val = RT4831_BLPWMEN_MASK; > > > + > > > + ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val); > > > + if (ret) > > > + return ret; > > > + > > > + ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval); > > > + if (ret) > > > + propval = RT4831_BLOVPLVL_21V; > > > + > > > + propval = min_t(u8, propval, RT4831_BLOVPLVL_29V); > > > + ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK, > > > + propval << RT4831_BLOVP_SHIFT); > > > + if (ret) > > > + return ret; > > > + > > > + ret = device_property_read_u8(dev, "richtek,channel-use", &propval); > > > + if (ret) { > > > + dev_err(dev, "richtek,channel-use DT property missing\n"); > > > + return ret; > > > + } > > > + > > > + if (!(propval & RT4831_BLCH_MASK)) { > > > + dev_err(dev, "No channel specified\n"); > > > + return -EINVAL; > > > + } > > > + > > > + return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval); > > > +} > > > + > > > +static int rt4831_bl_probe(struct platform_device *pdev) > > > +{ > > > + struct rt4831_priv *priv; > > > + struct backlight_properties bl_props = { .type = BACKLIGHT_RAW, > > > + .scale = BACKLIGHT_SCALE_LINEAR }; > > > + int ret; > > > + > > > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > > > + if (!priv) > > > + return -ENOMEM; > > > + > > > + priv->dev = &pdev->dev; > > > + > > > + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL); > > > + if (!priv->regmap) { > > > + dev_err(&pdev->dev, "Failed to init regmap\n"); > > > + return -ENODEV; > > > + } > > > + > > > + ret = rt4831_parse_backlight_properties(priv, &bl_props); > > > + if (ret) { > > > + dev_err(&pdev->dev, "Failed to parse backlight properties\n"); > > > + return ret; > > > + } > > > + > > > + priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv, > > > + &rt4831_bl_ops, &bl_props); > > > + if (IS_ERR(priv->bl)) { > > > + dev_err(&pdev->dev, "Failed to register backlight\n"); > > > + return PTR_ERR(priv->bl); > > > + } > > > + > > > + backlight_update_status(priv->bl); > > > + platform_set_drvdata(pdev, priv); > > > + > > > + return 0; > > > +} > > > + > > > +static int rt4831_bl_remove(struct platform_device *pdev) > > > +{ > > > + struct rt4831_priv *priv = platform_get_drvdata(pdev); > > > + struct backlight_device *bl_dev = priv->bl; > > > + > > > + bl_dev->props.brightness = 0; > > > + backlight_update_status(priv->bl); > > > + > > > + return 0; > > > +} > > > + > > > +static const struct of_device_id __maybe_unused rt4831_bl_of_match[] = { > > > + { .compatible = "richtek,rt4831-backlight", }, > > > + {} > > > +}; > > > +MODULE_DEVICE_TABLE(of, rt4831_bl_of_match); > > > + > > > +static struct platform_driver rt4831_bl_driver = { > > > + .driver = { > > > + .name = "rt4831-backlight", > > > + .of_match_table = rt4831_bl_of_match, > > > + }, > > > + .probe = rt4831_bl_probe, > > > + .remove = rt4831_bl_remove, > > > +}; > > > +module_platform_driver(rt4831_bl_driver); > > > + > > > +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); > > > +MODULE_LICENSE("GPL v2"); > > > -- > > > 2.7.4 > > >
HI, Rob Herring <robh@kernel.org> 於 2021年5月1日 週六 上午4:10寫道： > > On Mon, 26 Apr 2021 15:18:10 +0800, cy_huang wrote: > > From: ChiYuan Huang <cy_huang@richtek.com> > > > > Adds DT binding document for Richtek RT4831. > > > > Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> > > --- > > Resend this v6 patch series to loop devicetree reviewers. > > --- > > .../devicetree/bindings/mfd/richtek,rt4831.yaml | 90 ++++++++++++++++++++++ > > 1 file changed, 90 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/mfd/richtek,rt4831.yaml > > > > Reviewed-by: Rob Herring <robh@kernel.org> Will merge in next v7. Thanks.
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b74efa4..3f43834 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1065,6 +1065,16 @@ config MFD_RDC321X southbridge which provides access to GPIOs and Watchdog using the southbridge PCI device configuration space. +config MFD_RT4831 + tristate "Richtek RT4831 four channel WLED and Display Bias Voltage" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + This enables support for the Richtek RT4831 that includes 4 channel + WLED driving and Display Bias Voltage. It's commonly used to provide + power to the LCD display and LCD backlight. + config MFD_RT5033 tristate "Richtek RT5033 Power Management IC" depends on I2C diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 834f546..5986914 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -235,6 +235,7 @@ obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o obj-$(CONFIG_MFD_DLN2) += dln2.o +obj-$(CONFIG_MFD_RT4831) += rt4831.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o diff --git a/drivers/mfd/rt4831.c b/drivers/mfd/rt4831.c new file mode 100644 index 00000000..b169781 --- /dev/null +++ b/drivers/mfd/rt4831.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2021 Richtek Technology Corp. + * + * Author: ChiYuan Huang <cy_huang@richtek.com> + */ + +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#define RT4831_REG_REVISION 0x01 +#define RT4831_REG_ENABLE 0x08 +#define RT4831_REG_I2CPROT 0x15 + +#define RICHTEK_VENDOR_ID 0x03 +#define RT4831_VID_MASK GENMASK(1, 0) +#define RT4831_RESET_MASK BIT(7) +#define RT4831_I2CSAFETMR_MASK BIT(0) + +static const struct mfd_cell rt4831_subdevs[] = { + MFD_CELL_OF("rt4831-backlight", NULL, NULL, 0, 0, "richtek,rt4831-backlight"), + MFD_CELL_NAME("rt4831-regulator") +}; + +static bool rt4831_is_accessible_reg(struct device *dev, unsigned int reg) +{ + if (reg >= RT4831_REG_REVISION && reg <= RT4831_REG_I2CPROT) + return true; + return false; +} + +static const struct regmap_config rt4831_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT4831_REG_I2CPROT, + + .readable_reg = rt4831_is_accessible_reg, + .writeable_reg = rt4831_is_accessible_reg, +}; + +static int rt4831_probe(struct i2c_client *client) +{ + struct gpio_desc *enable_gpio; + struct regmap *regmap; + unsigned int chip_id; + int ret; + + enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(enable_gpio)) { + dev_err(&client->dev, "Failed to get 'enable' GPIO\n"); + return PTR_ERR(enable_gpio); + } + + regmap = devm_regmap_init_i2c(client, &rt4831_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return PTR_ERR(regmap); + } + + ret = regmap_read(regmap, RT4831_REG_REVISION, &chip_id); + if (ret) { + dev_err(&client->dev, "Failed to get H/W revision\n"); + return ret; + } + + if ((chip_id & RT4831_VID_MASK) != RICHTEK_VENDOR_ID) { + dev_err(&client->dev, "Chip vendor ID 0x%02x not matched\n", chip_id); + return -ENODEV; + } + + /* + * Used to prevent the abnormal shutdown. + * If SCL/SDA both keep low for one second to reset HW. + */ + ret = regmap_update_bits(regmap, RT4831_REG_I2CPROT, RT4831_I2CSAFETMR_MASK, + RT4831_I2CSAFETMR_MASK); + if (ret) { + dev_err(&client->dev, "Failed to enable I2C safety timer\n"); + return ret; + } + + return devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, rt4831_subdevs, + ARRAY_SIZE(rt4831_subdevs), NULL, 0, NULL); +} + +static int rt4831_remove(struct i2c_client *client) +{ + struct regmap *regmap = dev_get_regmap(&client->dev, NULL); + + /* Disable WLED and DSV outputs */ + return regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK); +} + +static const struct of_device_id __maybe_unused rt4831_of_match[] = { + { .compatible = "richtek,rt4831", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt4831_of_match); + +static struct i2c_driver rt4831_driver = { + .driver = { + .name = "rt4831", + .of_match_table = rt4831_of_match, + }, + .probe_new = rt4831_probe, + .remove = rt4831_remove, +}; +module_i2c_driver(rt4831_driver); + +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); +MODULE_LICENSE("GPL v2");