sunxi: video: Add support for LCD panels which need to be configured via i2c
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>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index a170c56..bbb4d1b 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -344,6 +344,30 @@
---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 @@
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 1238d82..f5efebb 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -183,6 +183,22 @@
#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 */