linux-kernel - Re: [PATCH 2/2] gpio: pca953x: use a per instance irq

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Date:   Mon, 21 Jan 2019 14:06:08 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marek Vasut <marex@...x.de>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH 2/2] gpio: pca953x: use a per instance irq_chip structure

On Wed, Jan 16, 2019 at 10:32 AM Thomas Petazzoni
<thomas.petazzoni@...tlin.com> wrote:

> When a system has two PCA953x GPIO expanders, the kernel complains with:
>
> gpio gpiochip2: (0-0021): detected irqchip that is shared with multiple gpiochips: please fix the driver.
>
> Indeed, there is a single instance of "struct irq_chip" that gets
> re-used for both PCA953x instance. This commit moves the "struct
> irq_chip" to be part of the "struct pca953x_chip", so that we have one
> "struct irq_chip" per PCA953X instance.
>
> As part of this, the name of the irq_chip is also made different on a
> per-instance basis, now using the dev_name() of the I2C device. This
> changes what is visible in /proc/interrupts.
>
> Before:
>
>  47:          0          0   pca953x  10 Edge      e0100000.sdhci cd
>  48:          0          0   pca953x   6 Edge      e0101000.sdhci cd
>
> After:
>
>  47:          0          0    0-0020  10 Edge      e0100000.sdhci cd
>  48:          2          0    0-0020   6 Edge      e0101000.sdhci cd
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...tlin.com>

Patch applied.

Yours,
Linus Walleij