Hi,
On 9/14/22 10:42, Tony Lindgren wrote:
> 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>
> 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 */
> >;
> };
>
Looking good on SK-AM625 E3.
Just for a reference, I also checked the PWM output for TIMER_IO2 (C15) and TIMER_IO3 (E15).
Tested-by: Georgi Vlaev <g-vlaev@xxxxxx>
--
Regards,
Georgi
