linux-kernel - Re: [RFC PATCH 0/3] Make TI dmtimer features more usable

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Date:   Mon, 31 Oct 2022 14:07:10 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Georgi Vlaev <g-vlaev@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>,
        Ladislav Michl <ladis@...ux-mips.org>,
        Nishanth Menon <nm@...com>, Suman Anna <s-anna@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 0/3] Make TI dmtimer features more usable

* Tony Lindgren <tony@...mide.com> [221031 11:46]:
> I have only lightly tested this so far to make sure I get clock output on
> k3-am625-sk on TIMER_IO2 at user expansion connector pin 10.

For reference, I used something like the patch below to configure the timer2
for clock output.

Regards,

Tony

8< ---------------------
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
@@ -143,6 +143,25 @@ led-0 {
 			default-state = "off";
 		};
 	};
+
+	main_pwm2: dmtimer-main-pwm-2 {
+		pinctrl-0 = <&main_timer2_pins_default>;
+		pinctrl-names = "default";
+		compatible = "ti,omap-dmtimer-pwm";
+		#pwm-cells = <3>;
+		ti,timers = <&main_timer2>;
+		interrupts-extended = <&main_timer2 2 IRQ_TYPE_EDGE_RISING>,
+				      <&main_timer2 1 IRQ_TYPE_EDGE_RISING>,
+				      <&main_timer2 0 IRQ_TYPE_EDGE_RISING>;
+		interrupt-names = "compare", "overflow", "match";
+		clocks = <&main_timer2>;
+	};
+};
+
+&main_timer2 {
+	interrupt-controller;
+	#interrupt-cells = <2>;
+	#clock-cells = <0>;
 };
 
 &main_pmx0 {
@@ -270,6 +289,13 @@ AM62X_IOPAD(0x07c, PIN_OUTPUT, 7) /* (P25) GPMC0_CLK.GPIO0_31 */
 		>;
 	};
 
+	main_timer2_pins_default: main-timer2-pins-default {
+		pinctrl-single,pins = <
+			/* (C15) PADCFG_CTRL_PADCONFIG118 0x000f41d8 TIMER_IO2 */
+			AM65X_IOPAD(0x1d8, PIN_OUTPUT, 2)
+		>;
+	};
+
 	main_gpio1_ioexp_intr_pins_default: main-gpio1-ioexp-intr-pins-default {
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x01d4, PIN_INPUT, 7) /* (B15) UART0_RTSn.GPIO1_23 */