Re: [PATCH] pinctrl: msm: Add support for MSM TLMM pinmux

[Hanumant Singh]

On 8/15/2013 4:10 PM, Josh Cartwright wrote:
> On Thu, Aug 15, 2013 at 02:58:31PM -0700, Hanumant Singh wrote:
> > On 8/15/2013 2:50 PM, Josh Cartwright wrote:
> > > On Thu, Aug 15, 2013 at 10:44:03AM -0700, Hanumant Singh wrote:
> > > > On 8/14/2013 12:29 PM, Linus Walleij wrote:
> > > > > On Tue, Jul 30, 2013 at 1:39 AM, Bjorn Andersson <bjorn@xxxxxxx> wrote:
> > > > > > On Wed, Jul 24, 2013 at 1:41 PM, Hanumant Singh <hanumant@xxxxxxxxxxxxxx> wrote:
> [..]
> > > > Ok i can switch to using pin groups defined in per soc files.
> > > > But in our case we have one soc going into different types of boards.
> > > > (atleast 3). In each of the boards the same external devices end up using
> > > > different pins. For ex camera on board 1 uses different pin group
> > > > then the same camera on board 2. Both having the same SOC.
> > > > So in this case the design would be to have all possible pin groups
> > > > for different boards enumerated in the same soc-pinctrl.c file?
> > > >
> > > > Also in this implementation I will have.
> > > > 1) pinctrl-msm.c => DT parsing and interface to framework.
> > > > 2) pinctrl-msm-tlmm<version>.c => Register programming and pin types
> > > > supported by a particular TLMM pinmux version.
> > >
> > > It isn't clear to me what you are trying to separate out between 1) and
> > > 2).  Seems like there should only be pinctrl-msm-tlmm<version>.c.
> > The idea is that we should be able to plug in the next TLMM version 4, with
> > the pintypes that it supports and its register programming semantics without
> > any changes to the DT parsing or interface to the framework. The DT
> > information describes the states of the pingroups.
> > How we handle them with respect to the pinctrl framework, does not change
> > with different versions of the TLMM.
>
> Okay, although I think that might be a bit too much indirection too
> soon.
>
> I'd rather the strategy be to have a straightforward driver supporting
> TLMMv3 only (with MSM8974 support), and only worry about introducing a
> generic TLMM parsing layer when we actually have a need for it.
>
> If nothing else, I'd at least suggest that you rename pinctrl-msm.c to
> pinctrl-msm-tlmm.c, if it's going to be housing the TLMM-generic DT
> parsing code.

Actually we already have a request from Bjorn to support TLMMv2 which 
has different pin types and register semantics.

Thanks
Hanumant

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