linux-kernel - Re: [PATCH v3 4/9] gpio: 104-idi-48: Migrate to the regmap-irq API

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Date:   Wed, 23 Nov 2022 19:28:50 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     linus.walleij@...aro.org, brgl@...ev.pl,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        michael@...le.cc, broonie@...nel.org
Subject: Re: [PATCH v3 4/9] gpio: 104-idi-48: Migrate to the regmap-irq API

On Tue, Nov 22, 2022 at 02:11:01AM -0500, William Breathitt Gray wrote:
> The regmap API supports IO port accessors so we can take advantage of
> regmap abstractions rather than handling access to the device registers
> directly in the driver.
> 
> For the 104-idi-48, we get an IRQ register with some status information
> and basic masking, but it's broken down by banks rather than individual
> GPIO. There are six banks (8 GPIO lines each) that correspond to the
> lower six bits of the IRQ register (bits 0-5):
> 
>     Base Address + 7 (Read): IRQ Status Register/IRQ Clear
>         Bit 0-5: Respective Bank IRQ Statuses
>         Bit 6: IRQ Status (Active Low)
>         Bit 7: IRQ Enable Status
>     Base Address + 7 (Write): IRQ Enable/Disable
>         Bit 0-5: Respective Bank IRQ Enable/Disable

> Cc: Mark Brown <broonie@...nel.org>

Hint: you may use --cc parameter to `git send-email ...` to Cc additional people.

...

> +#define IDI48_REGMAP_IRQ(_id) \
> +	[_id] = { \
> +		.mask = BIT((_id) / 8), \
> +		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH, }, \
>  	}

Same comments as per previous patch.

...

> +static const struct regmap_irq idi48_regmap_irqs[IDI48_NGPIO] = {
> +	IDI48_REGMAP_IRQ(0), IDI48_REGMAP_IRQ(1), IDI48_REGMAP_IRQ(2),
> +	IDI48_REGMAP_IRQ(3), IDI48_REGMAP_IRQ(4), IDI48_REGMAP_IRQ(5),
> +	IDI48_REGMAP_IRQ(6), IDI48_REGMAP_IRQ(7), IDI48_REGMAP_IRQ(8),
> +	IDI48_REGMAP_IRQ(9), IDI48_REGMAP_IRQ(10), IDI48_REGMAP_IRQ(11),
> +	IDI48_REGMAP_IRQ(12), IDI48_REGMAP_IRQ(13), IDI48_REGMAP_IRQ(14),
> +	IDI48_REGMAP_IRQ(15), IDI48_REGMAP_IRQ(16), IDI48_REGMAP_IRQ(17),
> +	IDI48_REGMAP_IRQ(18), IDI48_REGMAP_IRQ(19), IDI48_REGMAP_IRQ(20),
> +	IDI48_REGMAP_IRQ(21), IDI48_REGMAP_IRQ(22), IDI48_REGMAP_IRQ(23),
> +	IDI48_REGMAP_IRQ(24), IDI48_REGMAP_IRQ(25), IDI48_REGMAP_IRQ(26),
> +	IDI48_REGMAP_IRQ(27), IDI48_REGMAP_IRQ(28), IDI48_REGMAP_IRQ(29),
> +	IDI48_REGMAP_IRQ(30), IDI48_REGMAP_IRQ(31), IDI48_REGMAP_IRQ(32),
> +	IDI48_REGMAP_IRQ(33), IDI48_REGMAP_IRQ(34), IDI48_REGMAP_IRQ(35),
> +	IDI48_REGMAP_IRQ(36), IDI48_REGMAP_IRQ(37), IDI48_REGMAP_IRQ(38),
> +	IDI48_REGMAP_IRQ(39), IDI48_REGMAP_IRQ(40), IDI48_REGMAP_IRQ(41),
> +	IDI48_REGMAP_IRQ(42), IDI48_REGMAP_IRQ(43), IDI48_REGMAP_IRQ(44),
> +	IDI48_REGMAP_IRQ(45), IDI48_REGMAP_IRQ(46), IDI48_REGMAP_IRQ(47),

Perhaps here would be nice to have it like

	IDI48_REGMAP_IRQ(45), IDI48_REGMAP_IRQ(46), IDI48_REGMAP_IRQ(47), /* 45-47 */

?

> +};

...

> +	err = devm_regmap_add_irq_chip(dev, map, irq[id], IRQF_SHARED, 0, chip,
> +				       &chip_data);
> +	if (err) {

> +		dev_err(dev, "IRQ registration failed (%d)\n", err);
> +		return err;

I'm wondering if you plan to switch to dev_err_probe() at some point.

> +	}

-- 
With Best Regards,
Andy Shevchenko