This commits adds support for configuring a a bitbang i2c controller, which is used on some boards to configure the LCD panel (via i2c).
Signed-off-by: Hans de Goede hdegoede@redhat.com --- board/sunxi/Kconfig | 24 ++++++++++++++++++++++++ board/sunxi/board.c | 10 ++++++++++ include/configs/sunxi-common.h | 16 ++++++++++++++++ 3 files changed, 50 insertions(+)
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index 70e6f4d..ef59e21 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -349,6 +349,30 @@ config VIDEO_LCD_BL_PWM_ACTIVE_LOW ---help--- Set this if the backlight pwm output is active low.
+config VIDEO_LCD_PANEL_I2C + bool "LCD panel needs to be configured via i2c" + depends on VIDEO + default m + ---help--- + Say y here if the LCD panel needs to be configured via i2c. This + will add a bitbang i2c controller using gpios to talk to the LCD. + +config VIDEO_LCD_PANEL_I2C_SDA + string "LCD panel i2c interface SDA pin" + depends on VIDEO_LCD_PANEL_I2C + default "PG12" + ---help--- + Set the SDA pin for the LCD i2c interface. This takes a string in the + format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H. + +config VIDEO_LCD_PANEL_I2C_SCL + string "LCD panel i2c interface SCL pin" + depends on VIDEO_LCD_PANEL_I2C + default "PG10" + ---help--- + Set the SCL pin for the LCD i2c interface. This takes a string in the + format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H. +
# Note only one of these may be selected at a time! But hidden choices are # not supported by Kconfig diff --git a/board/sunxi/board.c b/board/sunxi/board.c index b70e00c..e1891d1 100644 --- a/board/sunxi/board.c +++ b/board/sunxi/board.c @@ -33,6 +33,12 @@ #include <linux/usb/musb.h> #include <net.h>
+#if defined CONFIG_VIDEO_LCD_PANEL_I2C && !(defined CONFIG_SPL_BUILD) +/* So that we can use pin names in Kconfig and sunxi_name_to_gpio() */ +int soft_i2c_gpio_sda; +int soft_i2c_gpio_scl; +#endif + DECLARE_GLOBAL_DATA_PTR;
/* add board specific code here */ @@ -152,6 +158,10 @@ void i2c_init_board(void) sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUNXI_GPB0_TWI0); sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUNXI_GPB0_TWI0); clock_twi_onoff(0, 1); +#if defined CONFIG_VIDEO_LCD_PANEL_I2C && !(defined CONFIG_SPL_BUILD) + soft_i2c_gpio_sda = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_PANEL_I2C_SDA); + soft_i2c_gpio_scl = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_PANEL_I2C_SCL); +#endif }
#ifdef CONFIG_SPL_BUILD diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index fa9ac29..dc9a8a8 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -243,6 +243,22 @@ #define CONFIG_SYS_I2C_MVTWSI #define CONFIG_SYS_I2C_SPEED 400000 #define CONFIG_SYS_I2C_SLAVE 0x7f + +#if defined CONFIG_VIDEO_LCD_PANEL_I2C && !(defined CONFIG_SPL_BUILD) +#define CONFIG_SYS_I2C_SOFT +#define CONFIG_SYS_I2C_SOFT_SPEED 50000 +#define CONFIG_SYS_I2C_SOFT_SLAVE 0x00 +#define CONFIG_VIDEO_LCD_I2C_BUS 0 /* The lcd panel soft i2c is bus 0 */ +#define CONFIG_SYS_SPD_BUS_NUM 1 /* And the axp209 i2c bus is bus 1 */ +/* We use pin names in Kconfig and sunxi_name_to_gpio() */ +#define CONFIG_SOFT_I2C_GPIO_SDA soft_i2c_gpio_sda +#define CONFIG_SOFT_I2C_GPIO_SCL soft_i2c_gpio_scl +#ifndef __ASSEMBLY__ +extern int soft_i2c_gpio_sda; +extern int soft_i2c_gpio_scl; +#endif +#endif + #define CONFIG_CMD_I2C
/* PMU */