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Message-ID: <CAD=FV=WLVpwBo1g41BYwMUdedN3MJcmfaWwYow=RfsLC5bX1jg@mail.gmail.com>
Date: Wed, 19 Dec 2012 15:30:58 -0800
From: Doug Anderson <dianders@...omium.org>
To: Vivek Gautam <gautam.vivek@...sung.com>
Cc: linux-usb@...r.kernel.org, yulgon.kim@...sung.com,
linux-samsung-soc@...r.kernel.org,
Praveen Paneri <p.paneri@...sung.com>,
gregkh@...uxfoundation.org, devicetree-discuss@...ts.ozlabs.org,
jg1.han@...sung.com,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
balbi@...com, kishon@...com, Kukjin Kim <kgene.kim@...sung.com>,
Alan Stern <stern@...land.harvard.edu>,
Rob Herring <rob.herring@...xeda.com>,
Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Subject: Re: [PATCH v5 3/4] USB: ehci-s5p: Add phy driver support
Vivek,
Again, not a high-level review, but...
On Tue, Dec 18, 2012 at 6:43 AM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
> Adding the phy driver to ehci-s5p. Keeping the platform data
> for continuing the smooth operation for boards which still uses it
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Acked-by: Jingoo Han <jg1.han@...sung.com>
> ---
> drivers/usb/host/ehci-s5p.c | 70 ++++++++++++++++++++++++++++++-------------
> 1 files changed, 49 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 46ca5ef..50c93af 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -17,6 +17,7 @@
> #include <linux/platform_device.h>
> #include <linux/of_gpio.h>
> #include <linux/platform_data/usb-ehci-s5p.h>
> +#include <linux/usb/phy.h>
> #include <linux/usb/samsung_usb_phy.h>
> #include <plat/usb-phy.h>
>
> @@ -33,6 +34,8 @@ struct s5p_ehci_hcd {
> struct device *dev;
> struct usb_hcd *hcd;
> struct clk *clk;
> + struct usb_phy *phy;
> + struct s5p_ehci_platdata *pdata;
> };
>
> static const struct hc_driver s5p_ehci_hc_driver = {
> @@ -66,6 +69,30 @@ static const struct hc_driver s5p_ehci_hc_driver = {
> .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
> };
>
> +static void s5p_ehci_phy_enable(struct s5p_ehci_hcd *s5p_ehci)
> +{
> + struct platform_device *pdev = to_platform_device(s5p_ehci->dev);
> +
> + if (s5p_ehci->phy) {
> + samsung_usbphy_set_type(s5p_ehci->phy, USB_PHY_TYPE_HOST);
This confuses me. Why are you setting the type to host here?
> + usb_phy_init(s5p_ehci->phy);
> + } else if (s5p_ehci->pdata->phy_init) {
> + s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
> + }
> +}
> +
> +static void s5p_ehci_phy_disable(struct s5p_ehci_hcd *s5p_ehci)
> +{
> + struct platform_device *pdev = to_platform_device(s5p_ehci->dev);
> +
> + if (s5p_ehci->phy) {
> + samsung_usbphy_set_type(s5p_ehci->phy, USB_PHY_TYPE_HOST);
...and why set it to host here?
> + usb_phy_shutdown(s5p_ehci->phy);
> + } else if (s5p_ehci->pdata->phy_exit) {
> + s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
> + }
> +}
> +
> static void s5p_setup_vbus_gpio(struct platform_device *pdev)
> {
> int err;
> @@ -88,20 +115,15 @@ static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
>
> static int s5p_ehci_probe(struct platform_device *pdev)
> {
> - struct s5p_ehci_platdata *pdata;
> + struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
> struct s5p_ehci_hcd *s5p_ehci;
> struct usb_hcd *hcd;
> struct ehci_hcd *ehci;
> struct resource *res;
> + struct usb_phy *phy;
> int irq;
> int err;
>
> - pdata = pdev->dev.platform_data;
> - if (!pdata) {
> - dev_err(&pdev->dev, "No platform data defined\n");
> - return -EINVAL;
> - }
> -
> /*
> * Right now device-tree probed devices don't get dma_mask set.
> * Since shared usb code relies on it, set it here for now.
> @@ -119,6 +141,19 @@ static int s5p_ehci_probe(struct platform_device *pdev)
> if (!s5p_ehci)
> return -ENOMEM;
>
> + phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
> + if (IS_ERR_OR_NULL(phy)) {
> + /* Fallback to pdata */
> + if (!pdata) {
> + dev_err(&pdev->dev, "no platform data or transceiver defined\n");
> + return -EPROBE_DEFER;
Shouldn't you return -EINVAL like the old code did?
> + } else {
> + s5p_ehci->pdata = pdata;
> + }
> + } else {
> + s5p_ehci->phy = phy;
> + }
> +
> s5p_ehci->dev = &pdev->dev;
>
> hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
> @@ -164,8 +199,7 @@ static int s5p_ehci_probe(struct platform_device *pdev)
> goto fail_io;
> }
>
> - if (pdata->phy_init)
> - pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
> + s5p_ehci_phy_enable(s5p_ehci);
>
> ehci = hcd_to_ehci(hcd);
> ehci->caps = hcd->regs;
> @@ -176,13 +210,15 @@ static int s5p_ehci_probe(struct platform_device *pdev)
> err = usb_add_hcd(hcd, irq, IRQF_SHARED);
> if (err) {
> dev_err(&pdev->dev, "Failed to add USB HCD\n");
> - goto fail_io;
> + goto fail_add_hcd;
> }
>
> platform_set_drvdata(pdev, s5p_ehci);
>
> return 0;
>
> +fail_add_hcd:
> + s5p_ehci_phy_disable(s5p_ehci);
> fail_io:
> clk_disable_unprepare(s5p_ehci->clk);
> fail_clk:
> @@ -192,14 +228,12 @@ fail_clk:
>
> static int s5p_ehci_remove(struct platform_device *pdev)
> {
> - struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
> struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
> struct usb_hcd *hcd = s5p_ehci->hcd;
>
> usb_remove_hcd(hcd);
>
> - if (pdata && pdata->phy_exit)
> - pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
> + s5p_ehci_phy_disable(s5p_ehci);
>
> clk_disable_unprepare(s5p_ehci->clk);
>
> @@ -223,14 +257,11 @@ static int s5p_ehci_suspend(struct device *dev)
> struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
> struct usb_hcd *hcd = s5p_ehci->hcd;
> bool do_wakeup = device_may_wakeup(dev);
> - struct platform_device *pdev = to_platform_device(dev);
> - struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
> int rc;
>
> rc = ehci_suspend(hcd, do_wakeup);
>
> - if (pdata && pdata->phy_exit)
> - pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
> + s5p_ehci_phy_disable(s5p_ehci);
>
> clk_disable_unprepare(s5p_ehci->clk);
>
> @@ -241,13 +272,10 @@ static int s5p_ehci_resume(struct device *dev)
> {
> struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
> struct usb_hcd *hcd = s5p_ehci->hcd;
> - struct platform_device *pdev = to_platform_device(dev);
> - struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
>
> clk_prepare_enable(s5p_ehci->clk);
>
> - if (pdata && pdata->phy_init)
> - pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
> + s5p_ehci_phy_enable(s5p_ehci);
>
> /* DMA burst Enable */
> writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
> --
> 1.7.6.5
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
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