On am625, pad c17 can be used either in gpio mode or pwm mode to control
the connected led. Let's change to use pwm-led for additional brighness
control.
The pwm controller is dmtimer7 for pad C17. We configure it for 128 Hz
rate (1000000000 / 7812500) similar to what has been done elsewhere for
pwm-leds.
Cc: Keerthy <j-keerthy@xxxxxx>
Cc: Nishanth Menon <nm@xxxxxx>
Cc: Vignesh Raghavendra <vigneshr@xxxxxx>
Tested-by: Georgi Vlaev <g-vlaev@xxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
arch/arm64/boot/dts/ti/k3-am625-sk.dts | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
--- a/arch/arm64/boot/dts/ti/k3-am625-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
@@ -131,18 +131,25 @@ vdd_sd_dv: regulator-4 {
};
leds {
- compatible = "gpio-leds";
- pinctrl-names = "default";
- pinctrl-0 = <&usr_led_pins_default>;
+ compatible = "pwm-leds";
led-0 {
label = "am62-sk:green:heartbeat";
- gpios = <&main_gpio1 49 GPIO_ACTIVE_HIGH>;
+ pwms = <&main_pwm7 0 7812500 0>;
+ max-brightness = <255>;
linux,default-trigger = "heartbeat";
function = LED_FUNCTION_HEARTBEAT;
default-state = "off";
};
};
+
+ main_pwm7: dmtimer-main-pwm-7 {
+ pinctrl-0 = <&usr_led_pins_default>;
+ pinctrl-names = "default";
+ compatible = "ti,omap-dmtimer-pwm";
+ #pwm-cells = <3>;
+ ti,timers = <&main_timer7>;
+ };
};
&main_pmx0 {
@@ -203,7 +210,7 @@ AM62X_IOPAD(0x240, PIN_INPUT, 0) /* (D17) MMC1_SDCD */
usr_led_pins_default: usr-led-pins-default {
pinctrl-single,pins = <
- AM62X_IOPAD(0x244, PIN_OUTPUT, 7) /* (C17) MMC1_SDWP.GPIO1_49 */
+ AM62X_IOPAD(0x244, PIN_OUTPUT, 2) /* (C17) MMC1_SDWP.TIMER_IO7 */
>;
};
--
2.37.3
