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SubjectRe: [PATCH 4/5] usb: ehci-s5p: Change to use phy provided by the generic phy framework
From
Hi Kamil,


On Mon, Oct 28, 2013 at 7:23 PM, Kamil Debski <k.debski@samsung.com> wrote:
> Hi Vivek,
>
>> From: Vivek Gautam [mailto:gautamvivek1987@gmail.com]
>> Sent: Saturday, October 26, 2013 11:41 AM
>>
>> Hi Kamil,
>>
>>
>> On Fri, Oct 25, 2013 at 7:45 PM, Kamil Debski <k.debski@samsung.com>
>> wrote:
>> > Change the phy provider used from the old usb phy specific to a new
>> > one using the generic phy framework.
>> >
>> > Signed-off-by: Kamil Debski <k.debski@samsung.com>
>> > Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
>> > ---

Similar change for ohci-exynos too ?

>> > drivers/usb/host/ehci-s5p.c | 21 +++++++++++----------
>> > 1 file changed, 11 insertions(+), 10 deletions(-)
>> >
>> > diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-
>> s5p.c
>> > index 7cc26e6..76606ff 100644
>> > --- a/drivers/usb/host/ehci-s5p.c
>> > +++ b/drivers/usb/host/ehci-s5p.c
>> > @@ -19,6 +19,7 @@
>> > #include <linux/module.h>
>> > #include <linux/of.h>
>> > #include <linux/of_gpio.h>
>> > +#include <linux/phy/phy.h>
>> > #include <linux/platform_device.h>
>> > #include <linux/platform_data/usb-ehci-s5p.h>
>> > #include <linux/usb/phy.h>
>> > @@ -45,7 +46,7 @@ static struct hc_driver __read_mostly
>> > s5p_ehci_hc_driver;
>> >
>> > struct s5p_ehci_hcd {
>> > struct clk *clk;
>> > - struct usb_phy *phy;
>> > + struct phy *phy;
>> > struct usb_otg *otg;

This can also be removed.

>> > struct s5p_ehci_platdata *pdata; }; @@ -77,10 +78,11 @@
>> > static int s5p_ehci_probe(struct platform_device *pdev) {
>> > struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
>> > struct s5p_ehci_hcd *s5p_ehci;
>> > + struct phy *phy;
>>
>> just a nit here:
>> Lets keep the pointer to 'phy' and 'phy_name' together ?
>> and move this above phy_name ?
>
> Thanks for pointing this out.
>
>> > struct usb_hcd *hcd;
>> > struct ehci_hcd *ehci;
>> > struct resource *res;
>> > - struct usb_phy *phy;
>> > + const char *phy_name;
>> > int irq;
>> > int err;
>> >
>> > @@ -103,14 +105,14 @@ static int s5p_ehci_probe(struct
>> platform_device *pdev)
>> > return -ENOMEM;
>> > }
>> > s5p_ehci = to_s5p_ehci(hcd);
>> > -
>> > + phy_name = of_get_property(pdev->dev.of_node, "phy-names",
>> NULL);

Sorry one more doubt here :-)
Now that we have HOST, DEVICE, HSIC0, HSIC1 as different PHYs,
and i think EHCI will be the candidate to request HSIC phy too (once
we have HSIC phy
initialization code available for each SoC);
shouldn't we be using of_count_phandle_with_args() to get HOST, and HSIC phys
and then request multiple phys here ?

>> > + phy = devm_phy_get(&pdev->dev, phy_name);
>>
>> Below check for exynos5440 was supposed to skip any request phy.
>> So shouldn't we place above two assignments to the original place where
>> devm_usb_get_phy() was called ?
>> May be i am not getting you intention of changing the place.
>
> Hm... You are right - if we want to leave this check and skip phy request
> for
> 5450 then I should leave the order as it was. And if we want to use the new
> phy driver for 5450 then the check to skip phy requesting should be simply
> removed.
>
>>
>> > if (of_device_is_compatible(pdev->dev.of_node,
>> > "samsung,exynos5440-ehci")) {
>> > s5p_ehci->pdata = &empty_platdata;
>> > goto skip_phy;
>> > }
>> >
>> > - phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
>> > if (IS_ERR(phy)) {
>> > /* Fallback to pdata */
>> > if (!pdata) {
>> > @@ -122,7 +124,6 @@ static int s5p_ehci_probe(struct platform_device
>> *pdev)
>> > }
>> > } else {
>> > s5p_ehci->phy = phy;
>> > - s5p_ehci->otg = phy->otg;
>> > }
>> >
>> > skip_phy:
>> > @@ -166,7 +167,7 @@ skip_phy:
>> > s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
>>
>> Lets remove this line and similar calls to 'set_host()' in the driver,
>> since we don't have s5p_ehci->otg anymore after the same is removed
>> above.
>> Anyways this was helping the old phy-samsung-usb2 driver, and not
>> needed now.
>
> Ok, I will.
>
>>
>> >
>> > if (s5p_ehci->phy)
>> > - usb_phy_init(s5p_ehci->phy);
>> > + phy_power_on(s5p_ehci->phy);
>> > else if (s5p_ehci->pdata->phy_init)
>> > s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
>> >
>> > @@ -188,7 +189,7 @@ skip_phy:
>> >
>> > fail_add_hcd:
>> > if (s5p_ehci->phy)
>> > - usb_phy_shutdown(s5p_ehci->phy);
>> > + phy_power_off(s5p_ehci->phy);
>> > else if (s5p_ehci->pdata->phy_exit)
>> > s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
>> > fail_io:
>> > @@ -209,7 +210,7 @@ static int s5p_ehci_remove(struct platform_device
>> *pdev)
>> > s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
>>
>> ditto
>>
>> >
>> > if (s5p_ehci->phy)
>> > - usb_phy_shutdown(s5p_ehci->phy);
>> > + phy_power_off(s5p_ehci->phy);
>> > else if (s5p_ehci->pdata->phy_exit)
>> > s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
>> >
>> > @@ -244,7 +245,7 @@ static int s5p_ehci_suspend(struct device *dev)
>> > s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
>> ditto
>>
>> >
>> > if (s5p_ehci->phy)
>> > - usb_phy_shutdown(s5p_ehci->phy);
>> > + phy_power_off(s5p_ehci->phy);
>> > else if (s5p_ehci->pdata->phy_exit)
>> > s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
>> >
>> > @@ -265,7 +266,7 @@ static int s5p_ehci_resume(struct device *dev)
>> > s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
>> ditto
>>
>> >
>> > if (s5p_ehci->phy)
>> > - usb_phy_init(s5p_ehci->phy);
>> > + phy_power_on(s5p_ehci->phy);
>> > else if (s5p_ehci->pdata->phy_init)
>> > s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
>> >
>> [..] Rest looks good. :-)
>>
>
> Thank you!
>
> Best wishes,
> --
> Kamil Debski
> Samsung R&D Institute Poland
>
>



--
Best Regards
Vivek Gautam


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