drivers: pwm: support for numaker m55m1x

Modify Nuvoton numaker pwm driver for m55m1x series.
Add pwm nodes in m55m1x.dtsi

Signed-off-by: cyliang tw <[email protected]>

Author: cyliangtw

drivers/pwm/pwm_numaker.c

@@ -25,6 +25,7 @@ LOG_MODULE_REGISTER(pwm_numaker, CONFIG_PWM_LOG_LEVEL);
 #define NUMAKER_SYSCLK_FREQ       DT_PROP(DT_NODELABEL(sysclk), clock_frequency)
 /* EPWM channel 0~5 mask */
 #define NUMAKER_PWM_CHANNEL_MASK  (0x3FU)
+#define NUMAKER_PWM_HCLK0         1U
 
 /* Device config */
 struct pwm_numaker_config {
@@ -432,6 +433,29 @@ static int pwm_numaker_clk_get_rate(EPWM_T *epwm, uint32_t *rate)
 	uint32_t clk_src;
 	uint32_t epwm_clk_src;
 
+#if defined(CONFIG_SOC_SERIES_M55M1X)
+	if (epwm == EPWM0) {
+		clk_src = CLK->EPWMSEL & CLK_EPWMSEL_EPWM0SEL_Msk;
+	} else if (epwm == EPWM1) {
+		clk_src = CLK->EPWMSEL & CLK_EPWMSEL_EPWM1SEL_Msk;
+	} else {
+		LOG_ERR("Invalid EPWM node");
+		return -EINVAL;
+	}
+
+	if (clk_src == NUMAKER_PWM_HCLK0) {
+		/* clock source is from HCLK0 clock */
+		epwm_clk_src = CLK_GetHCLK0Freq();
+	} else {
+		/* clock source is from PCLK */
+		SystemCoreClockUpdate();
+		if (epwm == EPWM0) {
+			epwm_clk_src = CLK_GetPCLK0Freq();
+		} else { /* (epwm == EPWM1) */
+			epwm_clk_src = CLK_GetPCLK2Freq();
+		}
+	}
+#else
 	if (epwm == EPWM0) {
 		clk_src = CLK->CLKSEL2 & CLK_CLKSEL2_EPWM0SEL_Msk;
 	} else if (epwm == EPWM1) {
@@ -453,6 +477,7 @@ static int pwm_numaker_clk_get_rate(EPWM_T *epwm, uint32_t *rate)
 			epwm_clk_src = CLK_GetPCLK1Freq();
 		}
 	}
+#endif
 	*rate = epwm_clk_src;
 	return 0;
 }

dts/arm/nuvoton/m55m1x.dtsi

@@ -436,6 +436,30 @@
 			status = "disabled";
 			#io-channel-cells = <1>;
 		};
+
+		epwm0: epwm@40242000 {
+			compatible = "nuvoton,numaker-pwm";
+			reg = <0x40242000 0x37c>;
+			interrupts = <31 0>, <32 0>, <33 0>;
+			interrupt-names = "pair0", "pair1", "pair2";
+			resets = <&rst NUMAKER_SYS_EPWM0RST>;
+			prescaler = <19>;
+			clocks = <&pcc NUMAKER_EPWM0_MODULE NUMAKER_CLK_EPWMSEL_EPWM0SEL_PCLK0 0>;
+			#pwm-cells = <3>;
+			status = "disabled";
+		};
+
+		epwm1: epwm@40282000 {
+			compatible = "nuvoton,numaker-pwm";
+			reg = <0x40282000 0x37c>;
+			interrupts = <35 0>, <36 0>, <37 0>;
+			interrupt-names = "pair0", "pair1", "pair2";
+			resets = <&rst NUMAKER_SYS_EPWM1RST>;
+			prescaler = <19>;
+			clocks = <&pcc NUMAKER_EPWM1_MODULE NUMAKER_CLK_EPWMSEL_EPWM1SEL_PCLK2 0>;
+			#pwm-cells = <3>;
+			status = "disabled";
+		};
 	};
 };