Re: [PATCH 2/2] arm: shmobile: lager: enable HS-USB

Hello.

(2014/10/07 12:25), Yoshihiro Shimoda wrote:

Hello.

(2014/10/06 9:59), Yoshihiro Shimoda wrote:

quoted

Hello.

(2014/10/04 4:50), Sergei Shtylyov wrote:

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On 10/02/2014 12:04 PM, Yoshihiro Shimoda wrote:

< snip >

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+&hsusb {
+	status = "okay";
+	renesas,enable-gpio = <&gpio5 18 GPIO_ACTIVE_LOW>;

    It's certainly active-high.

Since the current code has the following, we have to set the active_low...
However, the code is unreadable, I think. So, I will modify the code.

	/* check GPIO determining if USB function should be enabled */
	if (priv->dparam.enable_gpio) {
		gpio_request_one(priv->dparam.enable_gpio, GPIOF_IN, NULL);
		ret = !gpio_get_value(priv->dparam.enable_gpio);
		gpio_free(priv->dparam.enable_gpio);
		if (ret) {
			dev_warn(&pdev->dev,
				 "USB function not selected (GPIO %d)\n",
				 priv->dparam.enable_gpio);
			ret = -ENOTSUPP;
			goto probe_end_mod_exit;
		}
	}

I am confusing about the gpio_get_value()...
In case of ARM, gpio_get_value() will call gpiod_get_raw_value() finally.

gpio_get_value() in arch/arm/include/asm/gpio.h
 --> __gpio_get_value() in include/asm-generic/gpio.h
  --> gpiod_get_raw_value() in drivers/gpio/gpiolib.c

The gpiod_get_raw_value() doesn't care of the GPIO_ACTIVE_{HIGH,LOW}.
So, should I add gpiod_is_active_low() or someting in the renesas_usbhs driver?
Or, Do I misunderstand something?

I looked at the gpio-keys driver, and then I understand the renesas_usbhs driver should
have the gpio flags from of_get_named_gpio_flags().

So, I will try to modify the renesas_usbhs driver.

Best regards,
Yoshihiro Shimoda

Best regards,
Yoshihiro Shimoda

quoted

Best regards,
Yoshihiro Shimoda

quoted

WBR, Sergei

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