Re: [PATCHv2] Input: omap4-keypad: Add pinctrl support

From: Mitch Bradley
Date: Tue Oct 23 2012 - 13:51:26 EST

Perhaps I misunderstood what you were suggesting. I thought that, when
you said "explicitly manage all their resources", you meant that the
driver should know the platform-specific details about clocks and power
domains. That is one possible interpretation of the word "explicit".

Now I see that you meant that the driver should explicitly call
abstracted functions.

On 10/23/2012 7:20 AM, Felipe Balbi wrote:
> HI,
> On Tue, Oct 23, 2012 at 07:02:09AM -1000, Mitch Bradley wrote:
>> On 10/23/2012 12:03 AM, Felipe Balbi wrote:
>>> Hi,
>>> I much prefer having drivers explicitly manage all their resources,
>>> which would mean that pinctrl calls need to be done on probe() and, if
>>> necessary, during suspend()/resume().
>> Per-driver resource management is certainly convenient when you are
>> dealing with a single system, but it becomes difficult to maintain for
>> drivers that are shared among many platforms.
> why ? look at drivers/usb/dwc3/, we're using that on OMAP, exynos, PCIe
> and a couple of different FPGA implementations inside TI. Not to mention
> what other licensees of that IP core might have internally.
> So far no problesm with resources at all.
> We have frameworks exactly to hide the differences.
>> The industry trend for many years has been consolidation around a single
>> programming model per class of device. For example, SDHCI, EHCI, ATA.
>> This trend will only accelerate, as the cost of developing controller IP
>> and associated drivers increases. Such drivers need to be as
>> platform-agnostic as possible.
> that's why we have pinctrl framework to abstract the details about pin
> muxing.
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