linux-kernel - Re: [PATCH v2 2/5] mfd: qcom-spmi-pmic: use devm_mfd_add_devices instead of devm_of_platform

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Date:   Mon, 7 Jan 2019 11:53:07 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <andy.gross@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Doug Anderson <dianders@...omium.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Nicolas Dechesne <nicolas.dechesne@...aro.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        linux-arm-msm@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] mfd: qcom-spmi-pmic: use devm_mfd_add_devices
 instead of devm_of_platform_populate

On Mon, Jan 7, 2019 at 3:11 AM Brian Masney <masneyb@...tation.org> wrote:

> pmic_spmi_probe calls devm_of_platform_populate, which traverses all
> of the children in device tree from the parent down to the children,
> grandchildren, etc. of_irq_count is called on most of the nodes (via
> of_device_alloc) and this initializes all of the IRQs. Further along in
> the boot process, spmi-gpio is initialized as a hierarchical IRQ chip
> in a later patch (with spmi-arb as the parent IRQ domain), and the same
> hwirq is now associated with two Linux virqs and IRQs will not work as
> expected. Correct this issue by using devm_mfd_add_devices to initialize
> just the children so that IRQs are initialized on an as-needed basis.
>
> This patch also selects CONFIG_MFD_CORE since this is required by
> devm_mfd_add_devices.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>

Good catch! Now I see why this was acting so weird for you.
Also the MFD semantics are standardized and make much more
sense after this.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

I suppose Lee can merge this in orthogonal in the MFD tree,
the end result will be functional after the v5.1 merge window.

I think I should also fix qcom-pm8xxx after this, as well as
the similar SSBI code for elder platforms.

Yours,
Linus Walleij