Re: [PATCH v6 3/4] phy: rcar-gen3-usb2: add runtime ID/VBUS pin detection

[Rob Herring <robh@kernel.org>]

On Mon, Nov 30, 2015 at 10:44:32AM +0900, Yoshihiro Shimoda wrote:
> This patch adds support for runtime ID/VBUS pin detection if
> the channel 0 of R-Car gen3 is used. So, we are able to use
> the channel as both host and peripheral.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> ---
>  .../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt |  2 +

This could just be combined with the previous binding doc (and bindings 
are preferred to be separate patches).

Acked-by: Rob Herring <robh@kernel.org>

For the driver, there really should be a standard interface for ID/Vbus 
pins.

Rob

>  drivers/phy/phy-rcar-gen3-usb2.c                   | 43 +++++++++++++++++++++-
>  2 files changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> index affa0f7..2390e4e 100644
> --- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> @@ -18,6 +18,7 @@ properties. This is because HSUSB has registers to select USB 2.0 host or
>  peripheral at that channel:
>  - reg: offset and length of the partial HSUSB register block.
>  - reg-names: must be "hsusb".
> +- interrupts: interrupt specifier for the PHY.
>  
>  Example (R-Car H3):
>  
> @@ -25,6 +26,7 @@ Example (R-Car H3):
>  		compatible = "renesas,usb2-phy-r8a7795";
>  		reg = <0 0xee080200 0 0x700>, <0 0xe6590100 0 0x100>;
>  		reg-names = "usb2_host", "hsusb";
> +		interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
>  		clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
>  			 <&mstp7_clks R8A7795_CLK_HSUSB>;
>  	};
> diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
> index 2b5d890..ef332ef 100644
> --- a/drivers/phy/phy-rcar-gen3-usb2.c
> +++ b/drivers/phy/phy-rcar-gen3-usb2.c
> @@ -12,6 +12,7 @@
>   * published by the Free Software Foundation.
>   */
>  
> +#include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> @@ -25,14 +26,18 @@
>  #define USB2_SPD_RSM_TIMSET	0x10c
>  #define USB2_OC_TIMSET		0x110
>  #define USB2_COMMCTRL		0x600
> +#define USB2_OBINTSTA		0x604
> +#define USB2_OBINTEN		0x608
>  #define USB2_VBCTRL		0x60c
>  #define USB2_LINECTRL1		0x610
>  #define USB2_ADPCTRL		0x630
>  
>  /* INT_ENABLE */
> +#define USB2_INT_ENABLE_UCOM_INTEN	BIT(3)
>  #define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)
>  #define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)
> -#define USB2_INT_ENABLE_INIT		(USB2_INT_ENABLE_USBH_INTB_EN | \
> +#define USB2_INT_ENABLE_INIT		(USB2_INT_ENABLE_UCOM_INTEN | \
> +					 USB2_INT_ENABLE_USBH_INTB_EN | \
>  					 USB2_INT_ENABLE_USBH_INTA_EN)
>  
>  /* USBCTR */
> @@ -48,6 +53,12 @@
>  /* COMMCTRL */
>  #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */
>  
> +/* OBINTSTA and OBINTEN */
> +#define USB2_OBINT_SESSVLDCHG		BIT(12)
> +#define USB2_OBINT_IDDIGCHG		BIT(11)
> +#define USB2_OBINT_BITS			(USB2_OBINT_SESSVLDCHG | \
> +					 USB2_OBINT_IDDIGCHG)
> +
>  /* VBCTRL */
>  #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)
>  
> @@ -174,6 +185,9 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
>  
>  	val = readl(usb2_base + USB2_VBCTRL);
>  	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
> +	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
> +	val = readl(usb2_base + USB2_OBINTEN);
> +	writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
>  	val = readl(usb2_base + USB2_ADPCTRL);
>  	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
>  	val = readl(usb2_base + USB2_LINECTRL1);
> @@ -270,6 +284,23 @@ static struct phy_ops rcar_gen3_phy_usb2_ops = {
>  	.owner		= THIS_MODULE,
>  };
>  
> +static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
> +{
> +	struct rcar_gen3_chan *ch = _ch;
> +	void __iomem *usb2_base = ch->usb2.base;
> +	u32 status = readl(usb2_base + USB2_OBINTSTA);
> +	irqreturn_t ret = IRQ_NONE;
> +
> +	if (status & USB2_OBINT_BITS) {
> +		dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
> +		writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
> +		rcar_gen3_device_recognition(ch);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	return ret;
> +}
> +
>  static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
>  	{ .compatible = "renesas,usb2-phy-r8a7795" },
>  	{ }
> @@ -302,9 +333,19 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
>  
>  	/* To avoid error message by devm_ioremap_resource() */
>  	if (res) {
> +		int irq;
> +
>  		channel->hsusb.base = devm_ioremap_resource(dev, res);
>  		if (IS_ERR(channel->hsusb.base))
>  			channel->hsusb.base = NULL;
> +		/* call request_irq for OTG */
> +		irq = platform_get_irq(pdev, 0);
> +		if (irq >= 0)
> +			irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
> +					       IRQF_SHARED, dev_name(dev),
> +					       channel);
> +		if (irq < 0)
> +			dev_err(dev, "No irq handler (%d)\n", irq);
>  	}
>  
>  	/* devm_phy_create() will call pm_runtime_enable(dev); */
> -- 
> 1.9.1
>