Re: [PATCH 7/7] usb: xhci: plat: add vbus regulator control

[Jisheng Zhang]

cc linux-usb@xxxxxxxxxxxxxxx

On Fri, 4 Dec 2015 22:10:52 +0800
Jisheng Zhang  wrote:

> The Marvell BG4CT STB board has board level vbus control through gpio.
> This patch adds the vbus regulator control to support this board.
> 
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
> ---
>  drivers/usb/host/xhci-plat.c | 39 ++++++++++++++++++++++++++++++++++++++-
>  drivers/usb/host/xhci.h      |  2 ++
>  2 files changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index bb972a6..9bf44569 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -18,6 +18,7 @@
>  #include <linux/of.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/slab.h>
>  #include <linux/usb/phy.h>
>  #include <linux/usb/xhci_pdriver.h>
> @@ -116,6 +117,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  	struct clk              *clk;
>  	struct usb_phy		*usb_phy;
>  	struct phy		*phy;
> +	struct regulator	*vbus;
>  	int			ret;
>  	int			irq;
>  
> @@ -179,14 +181,31 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  
>  	device_wakeup_enable(hcd->self.controller);
>  
> +	vbus = devm_regulator_get(&pdev->dev, "vbus");
> +	if (PTR_ERR(vbus) == -ENODEV) {
> +		vbus = NULL;
> +	} else if (IS_ERR(vbus)) {
> +		ret = PTR_ERR(vbus);
> +		goto disable_clk;
> +	} else {
> +		ret = regulator_enable(vbus);
> +		if (ret) {
> +			dev_err(&pdev->dev,
> +				"failed to enable usb vbus regulator: %d\n",
> +				ret);
> +			goto disable_clk;
> +		}
> +	}
> +
>  	xhci = hcd_to_xhci(hcd);
>  	xhci->clk = clk;
> +	xhci->vbus = vbus;
>  	xhci->main_hcd = hcd;
>  	xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
>  			dev_name(&pdev->dev), hcd);
>  	if (!xhci->shared_hcd) {
>  		ret = -ENOMEM;
> -		goto disable_clk;
> +		goto disable_vbus;
>  	}
>  
>  	if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
> @@ -254,6 +273,10 @@ disable_usb2_phy:
>  put_usb3_hcd:
>  	usb_put_hcd(xhci->shared_hcd);
>  
> +disable_vbus:
> +	if (!vbus)
> +		regulator_disable(vbus);
> +
>  disable_clk:
>  	clk_disable_unprepare(clk);
>  
> @@ -268,6 +291,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	struct usb_hcd	*hcd = platform_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  	struct clk *clk = xhci->clk;
> +	struct regulator *vbus = xhci->vbus;
>  
>  	usb_remove_hcd(xhci->shared_hcd);
>  	xhci_plat_phy_exit(xhci->shared_hcd);
> @@ -278,6 +302,9 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	clk_disable_unprepare(clk);
>  	usb_put_hcd(hcd);
>  
> +	if (!vbus)
> +		regulator_disable(vbus);
> +
>  	return 0;
>  }
>  
> @@ -287,6 +314,7 @@ static int xhci_plat_suspend(struct device *dev)
>  	int ret;
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> +	struct regulator *vbus = xhci->vbus;
>  
>  	/*
>  	 * xhci_suspend() needs `do_wakeup` to know whether host is allowed
> @@ -303,6 +331,8 @@ static int xhci_plat_suspend(struct device *dev)
>  	xhci_plat_phy_exit(xhci->shared_hcd);
>  	xhci_plat_phy_exit(hcd);
>  	clk_disable_unprepare(xhci->clk);
> +	if (!vbus)
> +		ret = regulator_disable(vbus);
>  
>  	return ret;
>  }
> @@ -312,11 +342,18 @@ static int xhci_plat_resume(struct device *dev)
>  	int ret;
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> +	struct regulator *vbus = xhci->vbus;
>  
>  	ret = clk_prepare_enable(xhci->clk);
>  	if (ret)
>  		return ret;
>  
> +	if (!vbus) {
> +		ret = regulator_enable(vbus);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret = xhci_plat_phy_init(hcd);
>  	if (ret)
>  		return ret;
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 0b94512..1355d2a 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1541,6 +1541,8 @@ struct xhci_hcd {
>  	struct msix_entry	*msix_entries;
>  	/* optional clock */
>  	struct clk		*clk;
> +	/* optional regulator */
> +	struct regulator	*vbus;
>  	/* data structures */
>  	struct xhci_device_context_array *dcbaa;
>  	struct xhci_ring	*cmd_ring;

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