Using PWM to drive the backlight pin instead of a GPIO provides various advantages, that are described in commit 421c98d7d2 ("sunxi: display: Use PWM to drive backlight where applicable").
Defining SUNXI_PWM_PIN0 triggers the configuration of the PWM controller in the display driver.
Signed-off-by: Paul Kocialkowski contact@paulk.fr --- arch/arm/include/asm/arch-sunxi/pwm.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/arch-sunxi/pwm.h b/arch/arm/include/asm/arch-sunxi/pwm.h index 47eb433fb6..a9588a04f3 100644 --- a/arch/arm/include/asm/arch-sunxi/pwm.h +++ b/arch/arm/include/asm/arch-sunxi/pwm.h @@ -15,7 +15,8 @@
#define SUNXI_PWM_PERIOD_80PCT 0x04af03c0
-#if defined CONFIG_MACH_SUN4I || defined CONFIG_MACH_SUN5I +#if defined CONFIG_MACH_SUN4I || defined CONFIG_MACH_SUN5I || \ + defined CONFIG_MACH_SUN7I #define SUNXI_PWM_PIN0 SUNXI_GPB(2) #define SUNXI_PWM_MUX SUN4I_GPB_PWM #endif