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sunxi: video: Add support for LCD panels which need to be configured via i2c

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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>
This commit is contained in:
Hans de Goede 2015-02-16 17:23:25 +01:00
parent 242e3d893d
commit 55410089cb
3 changed files with 50 additions and 0 deletions
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24
board/sunxi/Kconfig
View file

@ -344,6 +344,30 @@ 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

10
board/sunxi/board.c
View file

@ -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

16
include/configs/sunxi-common.h
View file

@ -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 */