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SubjectRe: [PATCH v5 09/10] gpio: Add a driver for Cadence I3C GPIO expander
On Fri, Jun 22, 2018 at 1:49 PM, Boris Brezillon
<boris.brezillon@bootlin.com> wrote:
> Add a driver for Cadence I3C GPIO expander.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

> + scratchbuf = kmalloc(sizeof(*scratchbuf) * 2, GFP_KERNEL);

kmalloc_array() ?

> + ret = i3c_device_do_priv_xfers(gpioc->i3cdev, xfers,
> + ARRAY_SIZE(xfers));

One line?


> +static void cdns_i3c_gpio_set_multiple(struct gpio_chip *g,
> + unsigned long *mask,
> + unsigned long *bits)
> +{
> + struct cdns_i3c_gpio *gpioc = gpioc_to_cdns_gpioc(g);
> + u8 newovr;
> + int ret;
> +
> + newovr = (gpioc->ovr & ~(*mask)) | (*bits & *mask);
> + if (newovr == gpioc->ovr)
> + return;
> +
> + ret = cdns_i3c_gpio_write_reg(gpioc, OVR, newovr);
> + if (!ret)
> + gpioc->ovr = newovr;

You don't change mask here, why do you need a pointer to it?

> +}

> +static int cdns_i3c_gpio_get_multiple(struct gpio_chip *g,
> + unsigned long *mask,
> + unsigned long *bits)
> +{
> + struct cdns_i3c_gpio *gpioc = gpioc_to_cdns_gpioc(g);
> + int ret;
> + u8 ivr;
> +
> + ret = cdns_i3c_gpio_read_reg(gpioc, IVR, &ivr);
> + if (ret)
> + return ret;
> +
> + *bits = ivr & *mask & gpioc->dir;
> + *bits |= gpioc->ovr & *mask & ~gpioc->dir;

Ditto.

> +
> + return 0;
> +}

> +static void cdns_i3c_gpio_ibi_handler(struct i3c_device *i3cdev,
> + const struct i3c_ibi_payload *payload)
> +{
> + struct cdns_i3c_gpio *gpioc = i3cdev_get_drvdata(i3cdev);

> + u8 isr = 0;

Perhaps you need to check the result of _read_reg() below instead of
dummy assignment?

> + int i;
> +
> + cdns_i3c_gpio_read_reg(gpioc, ISR, &isr);

> + for (i = 0; i < 8; i++) {
> + unsigned int irq;
> +
> + if (!(BIT(i) & isr & gpioc->imr))
> + continue;

for_each_set_bit() ?

> +
> + irq = irq_find_mapping(gpioc->gpioc.irq.domain, i);
> + handle_nested_irq(irq);
> + }
> +}

> +static const struct i3c_device_id cdns_i3c_gpio_ids[] = {
> + I3C_DEVICE(0x1c9, 0x0, NULL),

> + { /* sentinel */ },

Slightly better without comma.

> +};
> +MODULE_DEVICE_TABLE(i3c, cdns_i3c_gpio_ids);

--
With Best Regards,
Andy Shevchenko

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