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Date: Fri, 4 Dec 2015 22:20:39 +0800
From: Jisheng Zhang <jszhang@...vell.com>
To: <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 7/7] usb: xhci: plat: add vbus regulator control
cc linux-usb@...r.kernel.org
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@...vell.com>
> ---
> 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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