| Message ID | 20200210101504.287366-1-linus.walleij@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] backlight: corgi: Convert to use GPIO descriptors | expand |
On Mon, Feb 10, 2020 at 11:15:04AM +0100, Linus Walleij wrote: > The code in the Corgi backlight driver can be considerably > simplified by moving to GPIO descriptors and lookup tables > from the board files instead of passing GPIO numbers using > the old API. > > Make sure to encode inversion semantics for the Akita and > Spitz platforms inside the GPIO lookup table and drop the > custom inversion semantics from the driver. > > All in-tree users are converted in this patch. > > Cc: Andrea Adami <andrea.adami@gmail.com> > Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> > --- > ChangeLog v1->v2: > - Collect Robert's ACK. > --- > arch/arm/mach-pxa/corgi.c | 12 ++++- > arch/arm/mach-pxa/spitz.c | 34 +++++++++++---- > drivers/video/backlight/corgi_lcd.c | 68 ++++++++--------------------- > include/linux/spi/corgi_lcd.h | 3 -- > 4 files changed, 54 insertions(+), 63 deletions(-) > > diff --git a/arch/arm/mach-pxa/corgi.c b/arch/arm/mach-pxa/corgi.c > index f2d73289230f..c9625dcae27c 100644 > --- a/arch/arm/mach-pxa/corgi.c > +++ b/arch/arm/mach-pxa/corgi.c > @@ -563,13 +563,20 @@ static void corgi_bl_kick_battery(void) > } > } > > +static struct gpiod_lookup_table corgi_lcdcon_gpio_table = { > + .dev_id = "spi0.1", How did you arrive at this dev_id? corgi_spi_devices set the bus num for corgi-lcd to 1. > + .table = { > + GPIO_LOOKUP("gpio-pxa", CORGI_GPIO_BACKLIGHT_CONT, > + "BL_CONT", GPIO_ACTIVE_HIGH), > + { }, > + }, > +}; > + > static struct corgi_lcd_platform_data corgi_lcdcon_info = { > .init_mode = CORGI_LCD_MODE_VGA, > .max_intensity = 0x2f, > .default_intensity = 0x1f, > .limit_mask = 0x0b, > - .gpio_backlight_cont = CORGI_GPIO_BACKLIGHT_CONT, > - .gpio_backlight_on = -1, > .kick_battery = corgi_bl_kick_battery, > }; > > @@ -609,6 +616,7 @@ static struct spi_board_info corgi_spi_devices[] = { > static void __init corgi_init_spi(void) > { > pxa2xx_set_spi_info(1, &corgi_spi_info); > + gpiod_add_lookup_table(&corgi_lcdcon_gpio_table); > spi_register_board_info(ARRAY_AND_SIZE(corgi_spi_devices)); > } > #else > diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c > index a4fdc399d152..82e80a257c0f 100644 > --- a/arch/arm/mach-pxa/spitz.c > +++ b/arch/arm/mach-pxa/spitz.c > @@ -525,13 +525,33 @@ static void spitz_bl_kick_battery(void) > } > } > > +static struct gpiod_lookup_table spitz_lcdcon_gpio_table = { > + .dev_id = "spi0.1", Similar to above, spitz_spi_devices set the bus number to 2. Daniel. > + .table = { > + GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_BACKLIGHT_CONT, > + "BL_CONT", GPIO_ACTIVE_LOW), > + GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_BACKLIGHT_ON, > + "BL_ON", GPIO_ACTIVE_HIGH), > + { }, > + }, > +}; > + > +static struct gpiod_lookup_table akita_lcdcon_gpio_table = { > + .dev_id = "spi0.1", > + .table = { > + GPIO_LOOKUP("gpio-pxa", AKITA_GPIO_BACKLIGHT_CONT, > + "BL_CONT", GPIO_ACTIVE_LOW), > + GPIO_LOOKUP("gpio-pxa", AKITA_GPIO_BACKLIGHT_ON, > + "BL_ON", GPIO_ACTIVE_HIGH), > + { }, > + }, > +}; > + > static struct corgi_lcd_platform_data spitz_lcdcon_info = { > .init_mode = CORGI_LCD_MODE_VGA, > .max_intensity = 0x2f, > .default_intensity = 0x1f, > .limit_mask = 0x0b, > - .gpio_backlight_cont = SPITZ_GPIO_BACKLIGHT_CONT, > - .gpio_backlight_on = SPITZ_GPIO_BACKLIGHT_ON, > .kick_battery = spitz_bl_kick_battery, > }; > > @@ -574,12 +594,10 @@ static struct pxa2xx_spi_controller spitz_spi_info = { > > static void __init spitz_spi_init(void) > { > - struct corgi_lcd_platform_data *lcd_data = &spitz_lcdcon_info; > - > - if (machine_is_akita()) { > - lcd_data->gpio_backlight_cont = AKITA_GPIO_BACKLIGHT_CONT; > - lcd_data->gpio_backlight_on = AKITA_GPIO_BACKLIGHT_ON; > - } > + if (machine_is_akita()) > + gpiod_add_lookup_table(&akita_lcdcon_gpio_table); > + else > + gpiod_add_lookup_table(&spitz_lcdcon_gpio_table); > > pxa2xx_set_spi_info(2, &spitz_spi_info); > spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices)); > diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c > index 68f7592c5060..25ef0cbd7583 100644 > --- a/drivers/video/backlight/corgi_lcd.c > +++ b/drivers/video/backlight/corgi_lcd.c > @@ -15,7 +15,7 @@ > #include <linux/kernel.h> > #include <linux/init.h> > #include <linux/delay.h> > -#include <linux/gpio.h> > +#include <linux/gpio/consumer.h> > #include <linux/fb.h> > #include <linux/lcd.h> > #include <linux/spi/spi.h> > @@ -90,9 +90,8 @@ struct corgi_lcd { > int mode; > char buf[2]; > > - int gpio_backlight_on; > - int gpio_backlight_cont; > - int gpio_backlight_cont_inverted; > + struct gpio_desc *backlight_on; > + struct gpio_desc *backlight_cont; > > void (*kick_battery)(void); > }; > @@ -403,13 +402,13 @@ static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity) > corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity); > > /* Bit 5 via GPIO_BACKLIGHT_CONT */ > - cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted; > + cont = !!(intensity & 0x20); > > - if (gpio_is_valid(lcd->gpio_backlight_cont)) > - gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont); > + if (lcd->backlight_cont) > + gpiod_set_value_cansleep(lcd->backlight_cont, cont); > > - if (gpio_is_valid(lcd->gpio_backlight_on)) > - gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity); > + if (lcd->backlight_on) > + gpiod_set_value_cansleep(lcd->backlight_on, intensity); > > if (lcd->kick_battery) > lcd->kick_battery(); > @@ -482,48 +481,17 @@ static int setup_gpio_backlight(struct corgi_lcd *lcd, > struct corgi_lcd_platform_data *pdata) > { > struct spi_device *spi = lcd->spi_dev; > - int err; > - > - lcd->gpio_backlight_on = -1; > - lcd->gpio_backlight_cont = -1; > - > - if (gpio_is_valid(pdata->gpio_backlight_on)) { > - err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on, > - "BL_ON"); > - if (err) { > - dev_err(&spi->dev, > - "failed to request GPIO%d for backlight_on\n", > - pdata->gpio_backlight_on); > - return err; > - } > - > - lcd->gpio_backlight_on = pdata->gpio_backlight_on; > - gpio_direction_output(lcd->gpio_backlight_on, 0); > - } > > - if (gpio_is_valid(pdata->gpio_backlight_cont)) { > - err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont, > - "BL_CONT"); > - if (err) { > - dev_err(&spi->dev, > - "failed to request GPIO%d for backlight_cont\n", > - pdata->gpio_backlight_cont); > - return err; > - } > - > - lcd->gpio_backlight_cont = pdata->gpio_backlight_cont; > - > - /* spitz and akita use both GPIOs for backlight, and > - * have inverted polarity of GPIO_BACKLIGHT_CONT > - */ > - if (gpio_is_valid(lcd->gpio_backlight_on)) { > - lcd->gpio_backlight_cont_inverted = 1; > - gpio_direction_output(lcd->gpio_backlight_cont, 1); > - } else { > - lcd->gpio_backlight_cont_inverted = 0; > - gpio_direction_output(lcd->gpio_backlight_cont, 0); > - } > - } > + lcd->backlight_on = devm_gpiod_get_optional(&spi->dev, > + "BL_ON", GPIOD_OUT_LOW); > + if (IS_ERR(lcd->backlight_on)) > + return PTR_ERR(lcd->backlight_on); > + > + lcd->backlight_cont = devm_gpiod_get_optional(&spi->dev, "BL_CONT", > + GPIOD_OUT_LOW); > + if (IS_ERR(lcd->backlight_cont)) > + return PTR_ERR(lcd->backlight_cont); > + > return 0; > } > > diff --git a/include/linux/spi/corgi_lcd.h b/include/linux/spi/corgi_lcd.h > index edf4beccdadb..0b857616919c 100644 > --- a/include/linux/spi/corgi_lcd.h > +++ b/include/linux/spi/corgi_lcd.h > @@ -11,9 +11,6 @@ struct corgi_lcd_platform_data { > int default_intensity; > int limit_mask; > > - int gpio_backlight_on; /* -1 if n/a */ > - int gpio_backlight_cont; /* -1 if n/a */ > - > void (*notify)(int intensity); > void (*kick_battery)(void); > }; > -- > 2.23.0 >
diff --git a/arch/arm/mach-pxa/corgi.c b/arch/arm/mach-pxa/corgi.c index f2d73289230f..c9625dcae27c 100644 --- a/arch/arm/mach-pxa/corgi.c +++ b/arch/arm/mach-pxa/corgi.c @@ -563,13 +563,20 @@ static void corgi_bl_kick_battery(void) } } +static struct gpiod_lookup_table corgi_lcdcon_gpio_table = { + .dev_id = "spi0.1", + .table = { + GPIO_LOOKUP("gpio-pxa", CORGI_GPIO_BACKLIGHT_CONT, + "BL_CONT", GPIO_ACTIVE_HIGH), + { }, + }, +}; + static struct corgi_lcd_platform_data corgi_lcdcon_info = { .init_mode = CORGI_LCD_MODE_VGA, .max_intensity = 0x2f, .default_intensity = 0x1f, .limit_mask = 0x0b, - .gpio_backlight_cont = CORGI_GPIO_BACKLIGHT_CONT, - .gpio_backlight_on = -1, .kick_battery = corgi_bl_kick_battery, }; @@ -609,6 +616,7 @@ static struct spi_board_info corgi_spi_devices[] = { static void __init corgi_init_spi(void) { pxa2xx_set_spi_info(1, &corgi_spi_info); + gpiod_add_lookup_table(&corgi_lcdcon_gpio_table); spi_register_board_info(ARRAY_AND_SIZE(corgi_spi_devices)); } #else diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c index a4fdc399d152..82e80a257c0f 100644 --- a/arch/arm/mach-pxa/spitz.c +++ b/arch/arm/mach-pxa/spitz.c @@ -525,13 +525,33 @@ static void spitz_bl_kick_battery(void) } } +static struct gpiod_lookup_table spitz_lcdcon_gpio_table = { + .dev_id = "spi0.1", + .table = { + GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_BACKLIGHT_CONT, + "BL_CONT", GPIO_ACTIVE_LOW), + GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_BACKLIGHT_ON, + "BL_ON", GPIO_ACTIVE_HIGH), + { }, + }, +}; + +static struct gpiod_lookup_table akita_lcdcon_gpio_table = { + .dev_id = "spi0.1", + .table = { + GPIO_LOOKUP("gpio-pxa", AKITA_GPIO_BACKLIGHT_CONT, + "BL_CONT", GPIO_ACTIVE_LOW), + GPIO_LOOKUP("gpio-pxa", AKITA_GPIO_BACKLIGHT_ON, + "BL_ON", GPIO_ACTIVE_HIGH), + { }, + }, +}; + static struct corgi_lcd_platform_data spitz_lcdcon_info = { .init_mode = CORGI_LCD_MODE_VGA, .max_intensity = 0x2f, .default_intensity = 0x1f, .limit_mask = 0x0b, - .gpio_backlight_cont = SPITZ_GPIO_BACKLIGHT_CONT, - .gpio_backlight_on = SPITZ_GPIO_BACKLIGHT_ON, .kick_battery = spitz_bl_kick_battery, }; @@ -574,12 +594,10 @@ static struct pxa2xx_spi_controller spitz_spi_info = { static void __init spitz_spi_init(void) { - struct corgi_lcd_platform_data *lcd_data = &spitz_lcdcon_info; - - if (machine_is_akita()) { - lcd_data->gpio_backlight_cont = AKITA_GPIO_BACKLIGHT_CONT; - lcd_data->gpio_backlight_on = AKITA_GPIO_BACKLIGHT_ON; - } + if (machine_is_akita()) + gpiod_add_lookup_table(&akita_lcdcon_gpio_table); + else + gpiod_add_lookup_table(&spitz_lcdcon_gpio_table); pxa2xx_set_spi_info(2, &spitz_spi_info); spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices)); diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c index 68f7592c5060..25ef0cbd7583 100644 --- a/drivers/video/backlight/corgi_lcd.c +++ b/drivers/video/backlight/corgi_lcd.c @@ -15,7 +15,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/fb.h> #include <linux/lcd.h> #include <linux/spi/spi.h> @@ -90,9 +90,8 @@ struct corgi_lcd { int mode; char buf[2]; - int gpio_backlight_on; - int gpio_backlight_cont; - int gpio_backlight_cont_inverted; + struct gpio_desc *backlight_on; + struct gpio_desc *backlight_cont; void (*kick_battery)(void); }; @@ -403,13 +402,13 @@ static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity) corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity); /* Bit 5 via GPIO_BACKLIGHT_CONT */ - cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted; + cont = !!(intensity & 0x20); - if (gpio_is_valid(lcd->gpio_backlight_cont)) - gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont); + if (lcd->backlight_cont) + gpiod_set_value_cansleep(lcd->backlight_cont, cont); - if (gpio_is_valid(lcd->gpio_backlight_on)) - gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity); + if (lcd->backlight_on) + gpiod_set_value_cansleep(lcd->backlight_on, intensity); if (lcd->kick_battery) lcd->kick_battery(); @@ -482,48 +481,17 @@ static int setup_gpio_backlight(struct corgi_lcd *lcd, struct corgi_lcd_platform_data *pdata) { struct spi_device *spi = lcd->spi_dev; - int err; - - lcd->gpio_backlight_on = -1; - lcd->gpio_backlight_cont = -1; - - if (gpio_is_valid(pdata->gpio_backlight_on)) { - err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on, - "BL_ON"); - if (err) { - dev_err(&spi->dev, - "failed to request GPIO%d for backlight_on\n", - pdata->gpio_backlight_on); - return err; - } - - lcd->gpio_backlight_on = pdata->gpio_backlight_on; - gpio_direction_output(lcd->gpio_backlight_on, 0); - } - if (gpio_is_valid(pdata->gpio_backlight_cont)) { - err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont, - "BL_CONT"); - if (err) { - dev_err(&spi->dev, - "failed to request GPIO%d for backlight_cont\n", - pdata->gpio_backlight_cont); - return err; - } - - lcd->gpio_backlight_cont = pdata->gpio_backlight_cont; - - /* spitz and akita use both GPIOs for backlight, and - * have inverted polarity of GPIO_BACKLIGHT_CONT - */ - if (gpio_is_valid(lcd->gpio_backlight_on)) { - lcd->gpio_backlight_cont_inverted = 1; - gpio_direction_output(lcd->gpio_backlight_cont, 1); - } else { - lcd->gpio_backlight_cont_inverted = 0; - gpio_direction_output(lcd->gpio_backlight_cont, 0); - } - } + lcd->backlight_on = devm_gpiod_get_optional(&spi->dev, + "BL_ON", GPIOD_OUT_LOW); + if (IS_ERR(lcd->backlight_on)) + return PTR_ERR(lcd->backlight_on); + + lcd->backlight_cont = devm_gpiod_get_optional(&spi->dev, "BL_CONT", + GPIOD_OUT_LOW); + if (IS_ERR(lcd->backlight_cont)) + return PTR_ERR(lcd->backlight_cont); + return 0; } diff --git a/include/linux/spi/corgi_lcd.h b/include/linux/spi/corgi_lcd.h index edf4beccdadb..0b857616919c 100644 --- a/include/linux/spi/corgi_lcd.h +++ b/include/linux/spi/corgi_lcd.h @@ -11,9 +11,6 @@ struct corgi_lcd_platform_data { int default_intensity; int limit_mask; - int gpio_backlight_on; /* -1 if n/a */ - int gpio_backlight_cont; /* -1 if n/a */ - void (*notify)(int intensity); void (*kick_battery)(void); };