linux-kernel - RE: [PATCH] usb: tegra: moving phy driver into drivers directory

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Date:	Thu, 30 Aug 2012 10:46:35 +0530
From:	Venu Byravarasu <vbyravarasu@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"ccross@...roid.com" <ccross@...roid.com>,
	"olof@...om.net" <olof@...om.net>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"balbi@...com" <balbi@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH] usb: tegra: moving phy driver into drivers directory

> -----Original Message-----
> From: linux-tegra-owner@...r.kernel.org [mailto:linux-tegra-
> owner@...r.kernel.org] On Behalf Of Stephen Warren
> Sent: Wednesday, August 29, 2012 11:01 PM
> To: Venu Byravarasu
> Cc: ccross@...roid.com; olof@...om.net; linux@....linux.org.uk;
> stern@...land.harvard.edu; gregkh@...uxfoundation.org; balbi@...com;
> linux-kernel@...r.kernel.org; linux-tegra@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-usb@...r.kernel.org
> Subject: Re: [PATCH] usb: tegra: moving phy driver into drivers directory
> 
> On 08/28/12 22:17, Venu Byravarasu wrote:
> > Stephen Warren wrote at Tuesday, August 28, 2012 7:37 PM:
> >> On 08/28/2012 02:32 AM, Venu Byravarasu wrote:
> >>> In order to keep up with the USB driver files organization,
> >>> moving USB phy driver from mach-tegra to drivers/USB directory.
> >>>
> >>> Signed-off-by: Venu Byravarasu <vbyravarasu@...dia.com>
> >>
> >>> diff --git a/arch/arm/mach-tegra/devices.c b/arch/arm/mach-
> >> tegra/devices.c
> >>
> >>> -struct tegra_ulpi_config tegra_ehci2_ulpi_phy_config = {
> >>> -	.reset_gpio = -1,
> >>> -	.clk = "cdev2",
> >>> -};
> >>> -
> >>>   struct tegra_ehci_platform_data tegra_ehci1_pdata = {
> >>>   	.operating_mode = TEGRA_USB_OTG,
> >>>   	.power_down_on_bus_suspend = 1,
> >>> @@ -450,7 +444,7 @@ struct tegra_ehci_platform_data
> tegra_ehci1_pdata
> >> = {
> >>>   };
> >>>
> >>>   struct tegra_ehci_platform_data tegra_ehci2_pdata = {
> >>> -	.phy_config = &tegra_ehci2_ulpi_phy_config,
> >>> +	.phy_config = NULL,
> >>
> >> The PHY driver checks that field isn't NULL, and fails if it is:
> >>
> >>> struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int
> >> instance,
> >>>          void __iomem *regs, void *config, enum tegra_usb_phy_mode
> >> phy_mode)
> >>> {
> >> ...
> >>>          phy->config = config;
> >>>          phy->mode = phy_mode;
> >>>
> >>>          if (!phy->config) {
> >>>                  if (phy_is_ulpi(phy)) {
> >>>                          pr_err("%s: ulpi phy configuration missing", __func__);
> >>>                          err = -EINVAL;
> >>>                          goto err0;
> >>
> >> So, this change will completely break ULPI support, which currently
> >> works fine. So, NAK.
> >
> > My initial plan was to add support for phy interfaces one by one.
> > As part of that thought of UTMI only support at first and then add
> > ULPI and HSIC in next patches.
> > However as you were mentioning that it is not correct way, will
> > push ULPI & UTMI support at once in next patches.
> 
> But with the existing code, both ULPI and UTMI work. This patch breaks
> something that already works.
> 
> >> I also plan on deleting devices.[ch] in kernel 3.7, and moving the USB
> >> platform data into board-dt-tegra20.c, since that's the only place it's
> >> used right now. So, this patch would conflict with that rather badly. I
> >> just posted the patches for that to the linux-tegra mailing list last
> >> night. Do you have better proposals for that? Perhaps usb_phy.c should
> >> set phy->config to &ulpi_default in a similar fashion to how it works
> >> for UTMI; that would remove some of the coupling between the changes.
> >>
> >> BTW, in your response to Felipe, you said...
> >>
> >>> Thanks Felipe for your comments.
> >>> Created a patch to separate out phy related stuff to phy.h with you as a
> >> reviewer.
> >>> Plz let me know your comments.
> >>
> >> ... where is that patch?
> >
> > Plz see https://lkml.org/lkml/2012/8/28/58
> 
> Doesn't that link point at the patch I replied to?

Sorry, by mistake I sent the wrong one.
Here is the correct one: https://lkml.org/lkml/2012/8/29/40  

> 
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