linux-kernel - RE: [PATCH v2] phy: rcar-gen2 usb: Add Host/Function switching for USB0

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Date:	Mon, 6 Jul 2015 07:18:24 +0000
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	Phil Edworthy <phil.edworthy@...esas.com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	"Kishon Vijay Abraham I" <kishon@...com>
Subject: RE: [PATCH v2] phy: rcar-gen2 usb: Add Host/Function switching for
 USB0

Hi Phil-san,

Thank you very much for the patch!

> Sent: Thursday, July 02, 2015 5:06 PM
< snip >
> +/* VBUS change IRQ handler */
> +static irqreturn_t gpio_vbus_irq(int irq, void *data)
> +{
> +	struct rcar_gen2_channel *channel = data;
> +
> +	/* Wait 20ms before doing anything as VBUS needs to settle */
> +	schedule_delayed_work(&channel->work, msecs_to_jiffies(20));
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int probe_otg(struct platform_device *pdev,
> +	struct rcar_gen2_phy_driver *drv)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rcar_gen2_channel *ch = drv->channels;
> +	int irq;
> +	int ret;
> +
> +	/* GPIOs for Host/Fn switching */
> +	ch->gpio_id = of_get_named_gpio_flags(dev->of_node,
> +				"renesas,id-gpio", 0, NULL);
> +	ch->gpio_vbus = of_get_named_gpio_flags(dev->of_node,
> +				"renesas,vbus-gpio", 0, NULL);
> +
> +	/* Need valid ID and VBUS gpios for Host/Fn switching */
> +	if (gpio_is_valid(ch->gpio_id) && gpio_is_valid(ch->gpio_vbus)) {
> +		ch->use_otg = 1;
> +
> +		/* GPIO for ID input */
> +		ret = devm_gpio_request_one(dev, ch->gpio_id, GPIOF_IN, "id");
> +		if (ret)
> +			return ret;
> +
> +		/* GPIO for VBUS input */
> +		ret = devm_gpio_request_one(dev, ch->gpio_vbus, GPIOF_IN, "vbus");

According to the checkpatch.pl, "line over 80 characters".

> +		if (ret)
> +			return ret;
> +
> +		irq = gpio_to_irq(ch->gpio_vbus);
> +		ret = devm_request_irq(dev, irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
> +				"vbus_detect", ch);
> +		if (ret)
> +			return ret;
> +
> +		/* Optional GPIO for VBUS power */
> +		ch->gpio_vbus_pwr = of_get_named_gpio_flags(dev->of_node,
> +						"renesas,vbus-pwr-gpio", 0, NULL);

Same above.

> +		if (gpio_is_valid(ch->gpio_id)) {
> +			ret = devm_gpio_request_one(dev, ch->gpio_vbus_pwr,
> +					GPIOF_OUT_INIT_LOW, "vbus-pwr");
> +			if (ret)
> +				return ret;
> +		}
> +
> +	} else if (gpio_is_valid(ch->gpio_id)) {
> +		dev_err(dev, "Failed to get VBUS gpio\n");
> +		return ch->gpio_vbus;
> +	} else if (gpio_is_valid(ch->gpio_vbus)) {
> +		dev_err(dev, "Failed to get ID gpio\n");
> +		return ch->gpio_id;
> +	}
> +
> +	return 0;
> +}
> +
> +/* bind/unbind the peripheral controller */
> +static int rcar_gen2_usb_set_peripheral(struct usb_otg *otg,
> +					struct usb_gadget *gadget)
> +{
> +	otg->gadget = gadget;
> +	if (!gadget) {
> +		usb_gadget_vbus_disconnect(otg->gadget);

Since the otg->gadget is NULL, this driver should not call this function here.

> +		otg->state = OTG_STATE_UNDEFINED;
> +	}
> +
> +	return 0;
> +}
> +
>  static int rcar_gen2_phy_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
< snip >
> @@ -323,6 +540,14 @@ static int rcar_gen2_phy_probe(struct platform_device *pdev)
> 
>  	dev_set_drvdata(dev, drv);
> 
> +	/*
> +	 * If we already have something plugged into USB0, we won't get an edge
> +	 * on VBUS, so we have to manually schedule work to look at the VBUS
> +	 * and ID signals.
> +	 */
> +	if (drv->channels->use_otg)
> +		schedule_delayed_work(&drv->channels->work, msecs_to_jiffies(100));

This line is also "line over 80 characters".

Best regards,
Yoshihiro Shimoda

> +
>  	return 0;
>  }
> 
> --
> 1.9.1

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