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From:   Bartosz Golaszewski <bgolaszewski@baylibre.com>
Date:   Wed, 28 Aug 2019 10:42:38 +0200
Message-ID: <CAMpxmJWyZV48zxwk0bCGV1eSbHvAimi38=vX3xq9qRpQ6ENtCw@mail.gmail.com>
Subject: Re: [PATCH 2/2] gpio: pca953x.c: Use pca953x_read_regs instead of regmap_bulk_read
To:     David Jander <david@protonic.nl>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio <linux-gpio@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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wt., 27 sie 2019 o 08:47 David Jander <david@protonic.nl> napisa=C5=82(a):
>
> The register number needs to be translated for chips with more than 8
> ports. This patch fixes a bug causing all chips with more than 8 GPIO pin=
s
> to not work correctly.
>
> Signed-off-by: David Jander <david@protonic.nl>
> ---
>  drivers/gpio/gpio-pca953x.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index 30072a570bc2..48fea4c68e8d 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -606,8 +606,7 @@ static void pca953x_irq_bus_sync_unlock(struct irq_da=
ta *d)
>         u8 invert_irq_mask[MAX_BANK];
>         u8 reg_direction[MAX_BANK];
>
> -       regmap_bulk_read(chip->regmap, chip->regs->direction, reg_directi=
on,
> -                        NBANK(chip));
> +       pca953x_read_regs(chip, chip->regs->direction, reg_direction);
>
>         if (chip->driver_data & PCA_PCAL) {
>                 /* Enable latch on interrupt-enabled inputs */
> @@ -710,8 +709,7 @@ static bool pca953x_irq_pending(struct pca953x_chip *=
chip, u8 *pending)
>                 return false;
>
>         /* Remove output pins from the equation */
> -       regmap_bulk_read(chip->regmap, chip->regs->direction, reg_directi=
on,
> -                        NBANK(chip));
> +       pca953x_read_regs(chip, chip->regs->direction, reg_direction);
>         for (i =3D 0; i < NBANK(chip); i++)
>                 cur_stat[i] &=3D reg_direction[i];
>
> @@ -789,8 +787,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chi=
p,
>          * interrupt.  We have to rely on the previous read for
>          * this purpose.
>          */
> -       regmap_bulk_read(chip->regmap, chip->regs->direction, reg_directi=
on,
> -                        NBANK(chip));
> +       pca953x_read_regs(chip, chip->regs->direction, reg_direction);
>         for (i =3D 0; i < NBANK(chip); i++)
>                 chip->irq_stat[i] &=3D reg_direction[i];
>         mutex_init(&chip->irq_lock);
> --
> 2.19.1
>

Applied to fixes. Thanks!

Bart