linux-kernel - Re: [PATCH 1/2] pinctrl: qcom: spmi-gpio: correct parent irqspec translation

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Date:   Fri, 13 Aug 2021 10:57:55 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     satya priya <skakit@...eaurora.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Collins <collinsd@...eaurora.org>,
        Kiran Gunda <kgunda@...eaurora.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, MSM <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: qcom: spmi-gpio: correct parent irqspec translation

Hi Satya/David,

nice work on identifying this bug!

On Fri, Aug 13, 2021 at 6:56 AM satya priya <skakit@...eaurora.org> wrote:
>
> From: David Collins <collinsd@...eaurora.org>
>
> pmic_gpio_child_to_parent_hwirq() and
> gpiochip_populate_parent_fwspec_fourcell() translate a pinctrl-
> spmi-gpio irqspec to an SPMI controller irqspec.  When they do
> this, they use a fixed SPMI slave ID of 0 and a fixed GPIO
> peripheral offset of 0xC0 (corresponding to SPMI address 0xC000).
> This translation results in an incorrect irqspec for secondary
> PMICs that don't have a slave ID of 0 as well as for PMIC chips
> which have GPIO peripherals located at a base address other than
> 0xC000.
>
> Correct this issue by passing the slave ID of the pinctrl-spmi-
> gpio device's parent in the SPMI controller irqspec and by
> calculating the peripheral ID base from the device tree 'reg'
> property of the pinctrl-spmi-gpio device.
>
> Signed-off-by: David Collins <collinsd@...eaurora.org>
> Signed-off-by: satya priya <skakit@...eaurora.org>

Is this a regression or is it fine if I just apply it for v5.15?
I was thinking v5.15 since it isn't yet used in device trees.

Yours,
Linus Walleij