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References: <20220518192924.20948-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20220518192924.20948-5-prabhakar.mahadev-lad.rj@bp.renesas.com>
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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Thu, 19 May 2022 15:30:07 +0200
Message-ID: <CACRpkdYt-doG_i2T9jjDCb8=oJFR_7Z8RCwW+S05qd90E3FgLg@mail.gmail.com>
Subject: Re: [PATCH v4 4/7] gpio: gpiolib: Dont assume child_offset_to_irq
 callback always succeeds
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     Marc Zyngier <maz@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Thomas Gleixner <tglx@linutronix.de>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        linux-gpio@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Prabhakar <prabhakar.csengg@gmail.com>,
        linux-renesas-soc@vger.kernel.org,
        Phil Edworthy <phil.edworthy@renesas.com>,
        Biju Das <biju.das.jz@bp.renesas.com>
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On Wed, May 18, 2022 at 9:30 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:

> On Renesas RZ/G2L SoC not all the GPIO pins can be simultaneously used as
> interrupts. The SoC allows 32 interrupts which is first come first serve
> basis and is dynamic i.e. if there is a free slot (after rmmod) this can
> be used by other GPIO pins being used as an interrupt.
>
> To handle such cases change child_offset_to_irq() callback to return error
> codes in case of failure. All the users of child_offset_to_irq() callback
> are also updated with this API change.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

This looks very useful!
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij