mediatek: filogic: set correct PWM clock and clean thermal zone

 * set correct clocks for PWM to work.
 * MT7986 PWM does have the 26MHz-clock-select, set that in patch
 * drop useless 'passive' trip point in thermal zone
 * extend pwm-fan to have 3 active operating points
 * set reasonable trip points in thermal zone
 * invert pwm-fan operating points and set shorter period to allow
   less noisy operation of the PWM fan of the BPi-R3.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/dts/mt7986a-bananapi-bpi-r3.dts

@@ -447,7 +447,8 @@
 };
 
 &fan {
-	pwms = <&pwm 0 500000 0>;
+	pwms = <&pwm 0 10000 0>;
+	cooling-levels = <255 96 52 0>;
 	status = "okay";
 };
 

target/linux/mediatek/files-5.15/arch/arm64/boot/dts/mediatek/mt7986a.dtsi

@@ -206,8 +206,8 @@
 			#clock-cells = <1>;
 			#pwm-cells = <2>;
 			interrupts = <GIC_SPI 137 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&topckgen CLK_TOP_PWM_SEL>,
-				 <&infracfg CLK_INFRA_PWM_BSEL>,
+			clocks = <&infracfg CLK_INFRA_PWM_HCK>,
+				 <&infracfg CLK_INFRA_PWM_STA>,
 				 <&infracfg CLK_INFRA_PWM1_CK>,
 				 <&infracfg CLK_INFRA_PWM2_CK>;
 			clock-names = "top", "main", "pwm1", "pwm2";
@@ -664,8 +664,8 @@
 
 	fan: pwm-fan {
 		compatible = "pwm-fan";
-		/* cooling level (0, 1, 2) : (0% duty, 50% duty, 100% duty) */
-		cooling-levels = <0 128 255>;
+		/* cooling level (0, 1, 2, 3) : (0% duty, 33% duty, 66% duty, 100% duty) */
+		cooling-levels = <0 86 172 255>;
 		#cooling-cells = <2>;
 		status = "disabled";
 	};
@@ -694,14 +694,14 @@
 					type = "active";
 				};
 
-				cpu_trip_active_low: active-low {
+				cpu_trip_active_med: active-med {
 					temperature = <85000>;
 					hysteresis = <2000>;
 					type = "active";
 				};
 
-				cpu_trip_passive: passive {
-					temperature = <40000>;
+				cpu_trip_active_low: active-low {
+					temperature = <60000>;
 					hysteresis = <2000>;
 					type = "passive";
 				};
@@ -709,24 +709,23 @@
 
 			cooling-maps {
 				cpu-active-high {
+					/* active: set fan to cooling level 3 */
+					cooling-device = <&fan 3 3>;
+					trip = <&cpu_trip_active_high>;
+				};
+
+				cpu-active-med {
 					/* active: set fan to cooling level 2 */
 					cooling-device = <&fan 2 2>;
-					trip = <&cpu_trip_active_high>;
+					trip = <&cpu_trip_active_med>;
 				};
 
 				cpu-active-low {
-					/* active: set fan to cooling level 1 */
+					/* passive: set fan to cooling level 1 */
 					cooling-device = <&fan 1 1>;
 					trip = <&cpu_trip_active_low>;
 				};
-
-				cpu-passive {
-					/* passive: set fan to cooling level 0 */
-					cooling-device = <&fan 0 0>;
-					trip = <&cpu_trip_passive>;
-				};
 			};
-
 		};
 	};
 };

target/linux/mediatek/patches-5.15/804-pwm-add-mt7986-support.patch

@@ -7,7 +7,7 @@
 +static const struct pwm_mediatek_of_data mt7986_pwm_data = {
 +	.num_pwms = 2,
 +	.pwm45_fixup = false,
-+	.has_ck_26m_sel = false,
++	.has_ck_26m_sel = true,
 +};
 +
  static const struct pwm_mediatek_of_data mt8516_pwm_data = {