linux-kernel - Re: [PATCH v9 3/7] mailbox: qcom: Move the apcs struct into a separate header

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Date:   Tue, 14 Nov 2017 10:12:12 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Georgi Djakov <georgi.djakov@...aro.org>, jassisinghbrar@...il.com,
        robh+dt@...nel.org, mturquette@...libre.com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v9 3/7] mailbox: qcom: Move the apcs struct into a
 separate header

On 11/13, Bjorn Andersson wrote:
> On Mon 13 Nov 18:12 PST 2017, Stephen Boyd wrote:
> 
> > On 10/27, Georgi Djakov wrote:
> > > Hi Bjorn,
> > > 
> > > Thanks for reviewing!
> > > 
> > > On 10/26/2017 07:28 AM, Bjorn Andersson wrote:
> > > > On Thu 21 Sep 09:49 PDT 2017, Georgi Djakov wrote:
> > > > 
> > > >> Move the structure shared by the APCS IPC device and its subdevices
> > > >> into a separate header file.
> > > >>
> > > > 
> > > > As you're creating the apcs regmap with devm_regmap_init_mmio() you can
> > > > just call dev_get_regmap(dev->parent) in your child to get the handle.
> > > 
> > > Ok, thanks!
> > > 
> > > > 
> > > > But I would prefer that you just add the clock code to the existing
> > > > driver.
> > > 
> > > This will require an ack from Stephen, and i got the impression that he
> > > prefers a separate clk driver [1].
> > > 
> > > Stephen, are you ok with registering the clocks from the apcs mailbox
> > > driver?
> > > 
> > > [1] https://lkml.org/lkml/2017/6/26/750
> > 
> > The parent regmap "trick" was the plan. Is something wrong with
> > that?
> > 
> 
> Not at all, but then this patch (moving apcs context to a shared header
> file) shouldn't be needed, or am I missing something?

Agreed.

> 
> > Not having random clk drivers scattered throughout the tree is
> > sort of nice because it makes for an easier time finding things
> > that are similar. Maybe that's an abuse of the driver model
> > though? Just to get things into some same directory. I'm fine
> > either way.
> > 
> 
> Keeping the clock driver in the clock subsystem does make sense. I see
> now that there is a include of a local header file as well, so that
> would just be messy to keep split.
> 
> I'm fine with the extra driver instance, it's the DT that I don't think
> should describe the fact that we want to keep the clock-part in the
> clock subsystem.
> 
> Do you see any problems spawning the clock driver programmatically and
> then calling of_clk_add_hw_provider() on the parent's of_node?

Nope. We shouldn't need to modify DT to make this work.

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