From: gregkh@linuxfoundation•org (Greg KH)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 01/15] drivers: phy: add generic PHY framework
Date: Tue, 23 Jul 2013 09:35:51 -0700 [thread overview]
Message-ID: <20130723163551.GA12990@kroah.com> (raw)
In-Reply-To: <51EEAF32.4040905@ti.com>
On Tue, Jul 23, 2013 at 09:58:34PM +0530, Kishon Vijay Abraham I wrote:
> Hi Greg,
>
> On Tuesday 23 July 2013 09:48 PM, Greg KH wrote:
> > On Tue, Jul 23, 2013 at 08:48:24PM +0530, Kishon Vijay Abraham I wrote:
> >> Hi,
> >>
> >> On Tuesday 23 July 2013 08:07 PM, Alan Stern wrote:
> >>> On Tue, 23 Jul 2013, Tomasz Figa wrote:
> >>>
> >>>> On Tuesday 23 of July 2013 09:29:32 Tomasz Figa wrote:
> >>>>> Hi Alan,
> >>>
> >>> Thanks for helping to clarify the issues here.
> >>>
> >>>>>> Okay. Are PHYs _always_ platform devices?
> >>>>>
> >>>>> They can be i2c, spi or any other device types as well.
> >>>
> >>> In those other cases, presumably there is no platform data associated
> >>> with the PHY since it isn't a platform device. Then how does the
> >>> kernel know which controller is attached to the PHY? Is this spelled
> >>> out in platform data associated with the PHY's i2c/spi/whatever parent?
> .
> .
> <snip>
> .
> .
> >>
> >> static struct phy *phy_lookup(void *priv) {
> >> .
> >> .
> >> if (phy->priv==priv) //instead of string comparison, we'll use pointer
> >> return phy;
> >> }
> >>
> >> PHY driver should be like
> >> phy_create((dev, ops, pdata->info);
> >>
> >> The controller driver would do
> >> phy_get(dev, NULL, pdata->info);
> >>
> >> Now the PHY framework will check for a match of *priv* pointer and return the PHY.
> >>
> >> I think this should be possible?
> >
> > Ick, no. Why can't you just pass the pointer to the phy itself? If you
> > had a "priv" pointer to search from, then you could have just passed the
> > original phy pointer in the first place, right?
> >
> > The issue is that a string "name" is not going to scale at all, as it
> > requires hard-coded information that will change over time (as the
> > existing clock interface is already showing.)
> >
> > Please just pass the real "phy" pointer around, that's what it is there
> > for. Your "board binding" logic/code should be able to handle this, as
> > it somehow was going to do the same thing with a "name".
>
> The problem is the board file won't have the *phy* pointer. *phy* pointer is
> created at a much later time when the phy driver is probed.
Ok, then save it then, as no one could have used it before then, right?
All I don't want to see is any "get by name/void *" functions in the
api, as that way is fragile and will break, as people have already
shown.
Just pass the real pointer around. If that is somehow a problem, then
something larger is a problem with how board devices are tied together :)
thanks,
greg k-h
next prev parent reply other threads:[~2013-07-23 16:35 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-18 6:46 [PATCH 00/15] PHY framework Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 01/15] drivers: phy: add generic " Kishon Vijay Abraham I
2013-07-18 7:20 ` Greg KH
2013-07-18 8:59 ` Kishon Vijay Abraham I
2013-07-18 15:49 ` Greg KH
2013-07-19 5:37 ` Kishon Vijay Abraham I
2013-07-19 5:43 ` Greg KH
2013-07-19 5:55 ` Kishon Vijay Abraham I
2013-07-19 6:29 ` Greg KH
2013-07-19 6:36 ` Kishon Vijay Abraham I
2013-07-19 15:54 ` Stephen Warren
2013-07-20 3:15 ` Kishon Vijay Abraham I
2013-07-19 23:50 ` Greg KH
2013-07-20 3:19 ` Kishon Vijay Abraham I
2013-07-20 22:00 ` Greg KH
2013-07-21 2:32 ` Alan Stern
2013-07-21 2:59 ` Greg KH
2013-07-21 10:22 ` Sascha Hauer
2013-07-21 15:48 ` Greg KH
2013-07-21 17:14 ` Sylwester Nawrocki
2013-07-21 19:22 ` Alan Stern
2013-07-22 7:25 ` Kishon Vijay Abraham I
2013-07-22 14:44 ` Alan Stern
2013-07-23 5:47 ` Kishon Vijay Abraham I
2013-07-23 7:29 ` Tomasz Figa
2013-07-23 7:55 ` Tomasz Figa
2013-07-23 14:37 ` Alan Stern
2013-07-23 14:50 ` Tomasz Figa
2013-07-23 15:18 ` Kishon Vijay Abraham I
2013-07-23 16:18 ` Greg KH
2013-07-23 16:28 ` Kishon Vijay Abraham I
2013-07-23 16:35 ` Greg KH [this message]
2013-07-23 16:50 ` Tomasz Figa
2013-07-23 17:37 ` Greg KH
2013-07-23 17:44 ` Mark Brown
2013-07-23 18:01 ` Greg KH
2013-07-23 19:31 ` Mark Brown
2013-07-23 19:44 ` Greg KH
2013-07-23 20:07 ` Tomasz Figa
2013-07-23 20:50 ` Greg KH
2013-07-23 21:05 ` Tomasz Figa
2013-07-23 21:23 ` Greg KH
2013-07-23 23:48 ` Mark Brown
2013-07-23 17:48 ` Tomasz Figa
2013-07-23 18:04 ` Greg KH
2013-07-23 20:46 ` Tomasz Figa
2013-07-23 19:36 ` Alan Stern
2013-07-23 20:20 ` Tomasz Figa
2013-07-23 20:53 ` Alan Stern
2013-07-23 21:02 ` Tomasz Figa
2013-07-23 21:14 ` Alan Stern
2013-07-23 21:31 ` Tomasz Figa
2013-07-24 18:32 ` Arnd Bergmann
2013-07-25 5:11 ` Kishon Vijay Abraham I
2013-07-25 7:54 ` Arnd Bergmann
2013-07-25 9:29 ` Sylwester Nawrocki
2013-07-25 9:29 ` Mark Brown
2013-07-25 10:11 ` Kishon Vijay Abraham I
2013-07-25 10:16 ` Laurent Pinchart
2013-07-25 10:26 ` Florian Fainelli
2013-07-25 11:00 ` Arnd Bergmann
2013-07-25 11:10 ` Laurent Pinchart
2013-07-25 12:09 ` Mark Brown
2013-07-23 17:34 ` Mark Brown
2013-07-22 15:04 ` Greg KH
2013-07-23 5:34 ` Kishon Vijay Abraham I
2013-07-21 10:31 ` Tomasz Figa
2013-07-21 11:07 ` Kishon Vijay Abraham I
2013-07-21 11:12 ` Tomasz Figa
2013-07-21 15:46 ` Greg KH
2013-07-30 7:11 ` Felipe Balbi
2013-07-31 5:44 ` Kishon Vijay Abraham I
2013-07-31 6:15 ` Felipe Balbi
2013-08-13 10:44 ` Kishon Vijay Abraham I
2013-08-13 11:37 ` Tomasz Figa
2013-08-13 12:05 ` Kishon Vijay Abraham I
2013-08-13 22:19 ` Sylwester Nawrocki
2013-08-13 23:04 ` Tomasz Figa
2013-08-14 15:05 ` Kishon Vijay Abraham I
2013-08-19 5:28 ` Kishon Vijay Abraham I
2013-08-20 12:26 ` Felipe Balbi
2013-07-18 6:46 ` [PATCH 02/15] usb: phy: omap-usb2: use the new " Kishon Vijay Abraham I
2013-07-18 7:21 ` Greg KH
2013-07-18 9:00 ` Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 03/15] usb: phy: twl4030: " Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 04/15] ARM: OMAP: USB: Add phy binding information Kishon Vijay Abraham I
2013-07-18 7:02 ` Tony Lindgren
2013-07-18 6:46 ` [PATCH 05/15] ARM: dts: omap: update usb_otg_hs data Kishon Vijay Abraham I
2013-07-18 7:05 ` Tony Lindgren
2013-07-18 6:46 ` [PATCH 06/15] usb: musb: omap2430: use the new generic PHY framework Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 07/15] usb: phy: omap-usb2: remove *set_suspend* callback from omap-usb2 Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 08/15] usb: phy: twl4030-usb: remove *set_suspend* and *phy_init* ops Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 09/15] phy: Add driver for Exynos MIPI CSIS/DSIM DPHYs Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 10/15] video: exynos_mipi_dsim: Use the generic PHY driver Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 11/15] exynos4-is: Use the generic MIPI CSIS " Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 12/15] ARM: Samsung: Remove the MIPI PHY setup code Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 13/15] phy: Add driver for Exynos DP PHY Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 14/15] video: exynos_dp: remove non-DT support for Exynos Display Port Kishon Vijay Abraham I
2013-07-18 6:46 ` [PATCH 15/15] video: exynos_dp: Use the generic PHY driver Kishon Vijay Abraham I
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