From: jy0922.shim@samsung•com (Joonyoung Shim)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 2/8 v2] ARM: EXYNOS5: Add machine data for USB 2.0
Date: Wed, 01 Aug 2012 12:02:41 +0900 [thread overview]
Message-ID: <50189C51.8080409@samsung.com> (raw)
In-Reply-To: <201207291311.08012.arnd@arndb.de>
On 07/29/2012 10:11 PM, Arnd Bergmann wrote:
> On Saturday 28 July 2012, Vivek Gautam wrote:
>>> Can you pleae explain why this is done in the changelog?
>>>
>>> We try hard to do such mappings from the device driver instead,
>>> so I'm surprised that this is necessary fo rthe USB phy.
>>>
>> We are doing the mapping for device address in the driver, but this memory
>> mapping for USB PHY registers that need to be programmed by the software
>> is done here. This is similar to what we see for exynos4 also. Is it
>> something
>> that i can still change? Please suggest.
>
> Yes, I think the USB PHY handling for all exynos chips should be changed
> from an ad-hoc method to a more formal device driver. As I commented
> in another patch of this series, I think the main problem is that
> treat the USB PHY as a property of the "platform", which it really isn't.
>
> We have a bunch of other USB PHY drivers for other platforms that are
> inside of the drivers/usb hierarchy. For all I know, there is no formal
> USB PHY driver API yet, and it seems that it would be a good idea to
> introduce one now, but for now, just move the code to
> drivers/usb/phy/ and make it one file per different kind of PHY.
>
Totally agree. I think that two PHY drivers need for usb2.0 PHY and
usb3.0 PHY in drivers/usb/phy directory. First, let's make usb2.0 PHY
driver for samsung SoCs from phy control codes of arch/arm, then add to
support usb2.0 PHY for exynos5 and make usb3.0 PHY driver for exynos.
Thanks.
next prev parent reply other threads:[~2012-08-01 3:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-21 10:32 [PATCH 0/8 v2] EXYNOS5: USB: Add USB 2.0 and USB 3.0 support for exynos5 Vivek Gautam
2012-07-21 10:32 ` [PATCH 1/8 v2] EXYNOS4: USB: Generalising setup-usb-phy driver for exynos Vivek Gautam
2012-07-21 10:32 ` [PATCH 2/8 v2] ARM: EXYNOS5: Add machine data for USB 2.0 Vivek Gautam
2012-07-26 11:24 ` Arnd Bergmann
2012-07-28 16:05 ` Vivek Gautam
2012-07-29 13:11 ` Arnd Bergmann
2012-08-01 3:02 ` Joonyoung Shim [this message]
2012-07-21 10:32 ` [PATCH 3/8 v2] ARM: EXYNOS5: Add OHCI device from device tree Vivek Gautam
2012-07-21 10:32 ` [PATCH 4/8 v2] ARM: EXYNOS5: Add EHCI " Vivek Gautam
2012-07-26 11:57 ` Arnd Bergmann
2012-07-28 16:42 ` Vivek Gautam
2012-07-21 10:32 ` [PATCH 5/8 v2] ARM: EXYNOS5: Add PHY initialization code for usb 2.0 Vivek Gautam
2012-07-26 12:08 ` Arnd Bergmann
2012-07-21 10:32 ` [PATCH 6/8 v2] ARM: EXYNOS5: Add machine data for USB3.0 Vivek Gautam
2012-07-21 10:32 ` [PATCH 7/8 v2] ARM: EXYNOS5: Add XHCI device from device tree Vivek Gautam
2012-07-21 10:32 ` [PATCH 8/8 v2] ARM: EXYNOS5: Add PHY initialization code for usb 3.0 Vivek Gautam
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