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SubjectRe: [PATCH v4 3/5] gpio: msc313: MStar MSC313 GPIO driver
On Sun, Nov 29, 2020 at 1:10 PM Daniel Palmer <daniel@0x0f.com> wrote:
>
> This adds a driver that supports the GPIO block found in
> MStar/SigmaStar ARMv7 SoCs.
>
> The controller seems to have enough register for 128 lines
> but where they are wired up differs between chips and
> no currently known chip uses anywhere near 128 lines so there
> needs to be some per-chip data to collect together what lines
> actually have physical pins attached and map the right names to them.
>
> The core peripherals seem to use the same lines on the
> currently known chips but the lines used for the sensor
> interface, lcd controller etc pins seem to be totally
> different between the infinity and mercury chips
>
> The code tries to collect all of the re-usable names,
> offsets etc together so that it's easy to build the extra
> per-chip data for other chips in the future.
>
> So far this only supports the MSC313 and MSC313E chips.
>
> Support for the SSC8336N (mercury5) is trivial to add once
> all of the lines have been mapped out.

...

> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>

Perhaps ordered?

...

> + /*
> + * only the spi0 pins have interrupts on the parent
> + * on all of the known chips and so far they are all
> + * mapped to the same place
> + */

You have a different comment style here (no capital letter, no period).

> + if (offset >= OFF_SPI0_CZ && offset <= OFF_SPI0_DO) {

Why not traditional pattern, i.e.

if (...)
return -EINVAL;
...

?

> + *parent_type = child_type;
> + *parent = ((offset - OFF_SPI0_CZ) >> 2) + 28;
> + return 0;
> + }
> +
> + return -EINVAL;

...

> + ret = devm_gpiochip_add_data(dev, gpiochip, gpio);
> + return ret;

Purpose?

return devm_...(...);

...

> +static int msc313_gpio_remove(struct platform_device *pdev)
> +{
> + return 0;
> +}

Purpose?

...

> +static const struct of_device_id msc313_gpio_of_match[] = {

> +#ifdef CONFIG_MACH_INFINITY

What's the point? Are you expecting two drivers for the same IP?

> + {
> + .compatible = "mstar,msc313-gpio",
> + .data = &msc313_data,
> + },
> +#endif
> + { }
> +};

...

> +static struct platform_driver msc313_gpio_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .of_match_table = msc313_gpio_of_match,
> + .pm = &msc313_gpio_ops,
> + },
> + .probe = msc313_gpio_probe,
> + .remove = msc313_gpio_remove,
> +};

> +

Redundant blank line.

> +builtin_platform_driver(msc313_gpio_driver);

--
With Best Regards,
Andy Shevchenko

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