Re: [PATCH 06/13] gpio: add AD24xx GPIO driver

Andy Shevchenko
2024-05-28T20:02:44Z

Fri, May 17, 2024 at 02:58:04PM +0200, Alvin Šipraga kirjoitti:
> From: Alvin Šipraga <alsi@bang-olufsen.dk>
>
> This driver adds GPIO function support for AD24xx A2B transceiver chips.

"Add GPIO..."

> When a GPIO is requested, the relevant pin is automatically muxed to
> GPIO mode. The device tree property gpio-reserved-ranges can be used to
> protect certain pins which are reserved for other functionality such as
> I2S/TDM data.

Why this doesn't use gpio-regmap?

...

> +config GPIO_AD24XX
> + tristate "Analog Devies Inc. AD24xx GPIO support"
> + depends on A2B_AD24XX_NODE
> + help
> + Say Y here to enable GPIO support for AD24xx A2B transceivers.

checkpatch probably complain about too short help text. You may extend it by
explaining how module will be called.

...

> +#include <linux/a2b/a2b.h>
> +#include <linux/a2b/ad24xx.h>

This seems to me not so generic as below...

+ bits.h
+ device.h
+ err.h

> +#include <linux/gpio/driver.h>

> +#include <linux/interrupt.h>

+ mod_devicetable.h

> +#include <linux/module.h>

+ mutex.h

> +#include <linux/of_irq.h>

Please, can we avoid OF in a new code?

> +#include <linux/regmap.h>

...hence move that group here and put a blank line before.

...

> +struct ad24xx_gpio {
> + struct device *dev;
> + struct a2b_func *func;
> + struct a2b_node *node;
> + struct regmap *regmap;
> + int irqs[AD24XX_MAX_GPIOS];

> + struct gpio_chip gpio_chip;

If you move this to be the first member, you might get less code being
generated at compile time.

> + struct irq_chip irq_chip;

Should not be here, but static.

> + struct mutex mutex;
> + unsigned int irq_invert : AD24XX_MAX_GPIOS;
> + unsigned int irq_enable : AD24XX_MAX_GPIOS;
> +};

...

> + if (ret)
> + dev_err(adg->dev,
> + "failed to update interrupt configuration: %d\n", ret);

Why and how is this useful?

...

> + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);

First of all it uses a wrong API (custom to IRQ core), second why do you need
this?

...

> + struct device_node *np;

> + np = of_irq_find_parent(dev->of_node);
> + if (!np)
> + return -ENOENT;
> +
> + parent_domain = irq_find_host(np);
> + of_node_put(np);
> + if (!parent_domain)
> + return -ENOENT;

Why is this magic needed?

...

> + ret = devm_gpiochip_add_data(dev, gpio_chip, adg);
> + if (ret)
> + return ret;
> +
> + return 0;

return devm_gpiochip_add_data(...);

--
With Best Regards,
Andy Shevchenko