linux-kernel - Re: [PATCH v3 2/6] spmi: pmic-arb: convert to v2 irq interfaces to support hierarchical IRQ chips

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Message-ID: <154724996786.169631.3834576842560322500@swboyd.mtv.corp.google.com>
Date:   Fri, 11 Jan 2019 15:39:27 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     andy.gross@...aro.org, bjorn.andersson@...aro.org,
        linus.walleij@...aro.org, marc.zyngier@....com,
        shawnguo@...nel.org, dianders@...omium.org,
        linux-gpio@...r.kernel.org, nicolas.dechesne@...aro.org,
        niklas.cassel@...aro.org, david.brown@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com, thierry.reding@...il.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/6] spmi: pmic-arb: convert to v2 irq interfaces to support hierarchical IRQ chips

Quoting Brian Masney (2019-01-11 15:00:04)
> On Fri, Jan 11, 2019 at 02:07:09PM -0800, Stephen Boyd wrote:
> > Quoting Brian Masney (2019-01-09 17:12:54)
> > > Convert the spmi-pmic-arb IRQ code to use the version 2 IRQ interface
> > > in order to support hierarchical IRQ chips. This is necessary so that
> > > spmi-gpio can be setup as a hierarchical IRQ chip with pmic-arb as the
> > > parent. IRQ chips in device tree should be usable from the start without
> > > the consumer having to make an additional call to gpio[d]_to_irq() to
> > > get the proper IRQ on the parent. Driver was tested on a LG Nexus 5
> > > (hammerhead) phone.
> > > 
> > > Signed-off-by: Brian Masney <masneyb@...tation.org>
> > > ---
> > > Changes since v2:
> > > - None
> > > 
> > > Changes since v1:
> > > - Add intspec variable to qpnpint_irq_domain_translate to reduce the
> > >   overall diff.
> > > - Remove irq_domain_disassociate hack.
> > 
> > I thought we would need to keep that around? And then dispose of the
> > hack later on. Won't this just wreck the world almost immediately
> > because the MFD is counting irqs from DT?
> 
> We won't run into the issue with the MFD counting the IRQs since the
> interrupts property was removed and the interrupt-controller property
> was added to device tree in the same patch. The interrupts property that
> we ultimately don't need was the issue that I ran into with the MFD
> subsystem.
> 
> However to be certain, I retested and we need the temporary hack since
> pmic_gpio_to_irq in this series uses the new SPMI IRQ controller. It
> breaks as soon as patch 4 in this series (qcom: spmi-gpio: add support
> for hierarchical IRQ chip) is applied but starts working again at patch
> 5 (ARM: dts: qcom: pm8941: add interrupt controller).
> 
> I'll respin this series this weekend with the temporary hack and drop it
> later in the series. Sorry about the noise and thanks for the
> reviewed-bys.
> 

Ok sounds good. Can you also fix all the spmi-gpio specifying dts files?
There are more than just two PMIC dts files that need changes (per my
grep results sent to the list earlier).