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SubjectRe: [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@bootlin.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@bootlin.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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