From: kishon@ti•com (Kishon Vijay Abraham I)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 01/15] drivers: phy: add generic PHY framework
Date: Sun, 21 Jul 2013 16:37:33 +0530 [thread overview]
Message-ID: <51EBC0F5.70601@ti.com> (raw)
In-Reply-To: <3839600.WiC1OLF35o@flatron>
Hi,
On Sunday 21 July 2013 04:01 PM, Tomasz Figa wrote:
> Hi,
>
> On Saturday 20 of July 2013 19:59:10 Greg KH wrote:
>> On Sat, Jul 20, 2013 at 10:32:26PM -0400, Alan Stern wrote:
>>> On Sat, 20 Jul 2013, Greg KH wrote:
>>>>>>> That should be passed using platform data.
>>>>>>
>>>>>> Ick, don't pass strings around, pass pointers. If you have
>>>>>> platform
>>>>>> data you can get to, then put the pointer there, don't use a
>>>>>> "name".
>>>>>
>>>>> I don't think I understood you here :-s We wont have phy pointer
>>>>> when we create the device for the controller no?(it'll be done in
>>>>> board file). Probably I'm missing something.
>>>>
>>>> Why will you not have that pointer? You can't rely on the "name" as
>>>> the device id will not match up, so you should be able to rely on
>>>> the pointer being in the structure that the board sets up, right?
>>>>
>>>> Don't use names, especially as ids can, and will, change, that is
>>>> going
>>>> to cause big problems. Use pointers, this is C, we are supposed to
>>>> be
>>>> doing that :)
>>>
>>> Kishon, I think what Greg means is this: The name you are using must
>>> be stored somewhere in a data structure constructed by the board file,
>>> right? Or at least, associated with some data structure somehow.
>>> Otherwise the platform code wouldn't know which PHY hardware
>>> corresponded to a particular name.
>>>
>>> Greg's suggestion is that you store the address of that data structure
>>> in the platform data instead of storing the name string. Have the
>>> consumer pass the data structure's address when it calls phy_create,
>>> instead of passing the name. Then you don't have to worry about two
>>> PHYs accidentally ending up with the same name or any other similar
>>> problems.
>>
>> Close, but the issue is that whatever returns from phy_create() should
>> then be used, no need to call any "find" functions, as you can just use
>> the pointer that phy_create() returns. Much like all other class api
>> functions in the kernel work.
>
> I think there is a confusion here about who registers the PHYs.
>
> All platform code does is registering a platform/i2c/whatever device,
> which causes a driver (located in drivers/phy/) to be instantiated. Such
> drivers call phy_create(), usually in their probe() callbacks, so
> platform_code has no way (and should have no way, for the sake of
> layering) to get what phy_create() returns.
right.
>
> IMHO we need a lookup method for PHYs, just like for clocks, regulators,
> PWMs or even i2c busses because there are complex cases when passing just
> a name using platform data will not work. I would second what Stephen said
> [1] and define a structure doing things in a DT-like way.
>
> Example;
>
> [platform code]
>
> static const struct phy_lookup my_phy_lookup[] = {
> PHY_LOOKUP("s3c-hsotg.0", "otg", "samsung-usbphy.1", "phy.2"),
The only problem here is that if *PLATFORM_DEVID_AUTO* is used while
creating the device, the ids in the device name would change and
PHY_LOOKUP wont be useful.
Thanks
Kishon
next prev parent reply other threads:[~2013-07-21 11:07 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
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 [this message]
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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