Linux内核-Beagle骨 - PWM PIN MUXING-设备树

发布于 2025-01-24 03:37:22 字数 641 浏览 4 评论 0原文

我正在尝试通过设备树在PWM模式下以PWM模式进行MUX GPMC_AD9 PIN

：ARCH/ARM/ARM/BOOT/DTS/AM335X-BONEBLACK.DTS，

&am33xx_pinmux {
    hw_pins: hw_pins {
        pinctrl-single,pins = <
             AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4)    /* gpmc_ad9.ehrpwm2B  */
        >;
     };
};

/ {
    soc {
        pinctrl-names = "default";
        pinctrl-0 = <&hw_pins>;
    };
};

但是Debugfs仍然显示

/sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single # cat pins | grep 824
pin 9 (PIN9) 44e10824 00000027 pinctrl-single

我在设备树中看不到的 PIN的模式7这个别针重新定义了

我在这里做错了什么？

原文

I'm trying to mux gpmc_ad9 pin in PWM mode through the device tree

file: arch/arm/boot/dts/am335x-boneblack.dts

&am33xx_pinmux {
    hw_pins: hw_pins {
        pinctrl-single,pins = <
             AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4)    /* gpmc_ad9.ehrpwm2B  */
        >;
     };
};

/ {
    soc {
        pinctrl-names = "default";
        pinctrl-0 = <&hw_pins>;
    };
};

However the debugfs still shows mode 7 for the pin

/sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single # cat pins | grep 824
pin 9 (PIN9) 44e10824 00000027 pinctrl-single

I don't see in the device tree that this pin get's redefined

What I'm doing wrong here?

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混吃等死 2025-01-31 03:37:22

我找到了解决方案，我必须将pinctrl属性放在另一个节点内。
我想那是因为SOC节点已经定义了pinctrl属性。

&am33xx_pinmux {
    hw_pins: hw_pins {
        pinctrl-single,pins = <
             AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4)    /* gpmc_ad9.ehrpwm2B  */
        >;
     };
};

/ {
    soc {
        mydriver {
              compatible = "mydriver";

              pinctrl-names = "default";
              pinctrl-0 = <&hw_pins>;
        };
       
    };
};

I've found the solution, I had to put pinctrl properties inside another node.
I guess that's because soc node already has pinctrl properties defined.

&am33xx_pinmux {
    hw_pins: hw_pins {
        pinctrl-single,pins = <
             AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE4)    /* gpmc_ad9.ehrpwm2B  */
        >;
     };
};

/ {
    soc {
        mydriver {
              compatible = "mydriver";

              pinctrl-names = "default";
              pinctrl-0 = <&hw_pins>;
        };
       
    };
};

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