linux-kernel - Re: [PATCH v3 5/5] gpio: syscon: Add support for the Xylon LogiCVC GPIOs

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Date:   Thu, 3 Oct 2019 07:26:56 -0400
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     linux-gpio <linux-gpio@...r.kernel.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 5/5] gpio: syscon: Add support for the Xylon LogiCVC
 GPIOs

Hi and thanks for the review!

On Thu 03 Oct 19, 10:26, Bartosz Golaszewski wrote:
> Hi Paul,
> 
> just two nits:
> 
> pt., 27 wrz 2019 o 12:04 Paul Kocialkowski
> <paul.kocialkowski@...tlin.com> napisał(a):
> >
> > The LogiCVC display hardware block comes with GPIO capabilities
> > that must be exposed separately from the main driver (as GPIOs) for
> > use with regulators and panels. A syscon is used to share the same
> > regmap across the two drivers.
> >
> > Since the GPIO capabilities are pretty simple, add them to the syscon
> > GPIO driver.
> >
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  drivers/gpio/gpio-syscon.c | 68 ++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 68 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
> > index 05c537ed73f1..cdcb913b8f0c 100644
> > --- a/drivers/gpio/gpio-syscon.c
> > +++ b/drivers/gpio/gpio-syscon.c
> > @@ -190,6 +190,70 @@ static const struct syscon_gpio_data keystone_dsp_gpio = {
> >         .set            = keystone_gpio_set,
> >  };
> >
> > +#define LOGICVC_CTRL_REG               0x40
> > +#define LOGICVC_CTRL_GPIO_SHIFT                11
> > +#define LOGICVC_CTRL_GPIO_BITS         5
> > +
> > +#define LOGICVC_POWER_CTRL_REG         0x78
> > +#define LOGICVC_POWER_CTRL_GPIO_SHIFT  0
> > +#define LOGICVC_POWER_CTRL_GPIO_BITS   4
> > +
> > +static void logicvc_gpio_offset(struct syscon_gpio_priv *priv,
> > +                               unsigned offset, unsigned int *reg,
> > +                               unsigned int *bit)
> > +{
> > +       if (offset >= LOGICVC_CTRL_GPIO_BITS) {
> > +               *reg = LOGICVC_POWER_CTRL_REG;
> > +
> > +               /* To the (virtual) power ctrl offset. */
> > +               offset -= LOGICVC_CTRL_GPIO_BITS;
> > +               /* To the actual bit offset in reg. */
> > +               offset += LOGICVC_POWER_CTRL_GPIO_SHIFT;
> > +       } else {
> > +               *reg = LOGICVC_CTRL_REG;
> > +
> > +               /* To the actual bit offset in reg. */
> > +               offset += LOGICVC_CTRL_GPIO_SHIFT;
> > +       }
> > +
> > +       *bit = BIT(offset);
> > +}
> > +
> > +static int logicvc_gpio_get(struct gpio_chip *chip, unsigned offset)
> > +{
> > +       struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
> > +       unsigned int reg;
> > +       unsigned int bit;
> > +       unsigned int value;
> 
> Can you put these on a single line?

Sure thing.

> > +       int ret;
> > +
> > +       logicvc_gpio_offset(priv, offset, &reg, &bit);
> > +
> > +       ret = regmap_read(priv->syscon, reg, &value);
> > +       if (ret)
> > +               return ret;
> > +
> > +       return !!(value & bit);
> > +}
> > +
> > +static void logicvc_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
> > +{
> > +       struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
> > +       unsigned int reg;
> > +       unsigned int bit;
> 
> Same here.

Will do!

Cheers,

Paul

> > +
> > +       logicvc_gpio_offset(priv, offset, &reg, &bit);
> > +
> > +       regmap_update_bits(priv->syscon, reg, bit, val ? bit : 0);
> > +}
> > +
> > +static const struct syscon_gpio_data logicvc_gpio = {
> > +       .flags          = GPIO_SYSCON_FEAT_OUT,
> > +       .bit_count      = LOGICVC_CTRL_GPIO_BITS + LOGICVC_POWER_CTRL_GPIO_BITS,
> > +       .get            = logicvc_gpio_get,
> > +       .set            = logicvc_gpio_set,
> > +};
> > +
> >  static const struct of_device_id syscon_gpio_ids[] = {
> >         {
> >                 .compatible     = "cirrus,ep7209-mctrl-gpio",
> > @@ -203,6 +267,10 @@ static const struct of_device_id syscon_gpio_ids[] = {
> >                 .compatible     = "rockchip,rk3328-grf-gpio",
> >                 .data           = &rockchip_rk3328_gpio_mute,
> >         },
> > +       {
> > +               .compatible     = "xylon,logicvc-3.02.a-gpio",
> > +               .data           = &logicvc_gpio,
> > +       },
> >         { }
> >  };
> >  MODULE_DEVICE_TABLE(of, syscon_gpio_ids);
> > --
> > 2.23.0
> >

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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