linux-kernel - Re: [PATCH v8 08/11] gpio: max7360: Add MAX7360 gpio support

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Message-ID: <aCsv3Me2J8cotW6s@smile.fi.intel.com>
Date: Mon, 19 May 2025 16:19:24 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Kamel Bouhara <kamel.bouhara@...tlin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Michael Walle <mwalle@...nel.org>, Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-pwm@...r.kernel.org,
	Grégory Clement <gregory.clement@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v8 08/11] gpio: max7360: Add MAX7360 gpio support

On Fri, May 09, 2025 at 11:14:42AM +0200, Mathieu Dubois-Briand wrote:
> Add driver for Maxim Integrated MAX7360 GPIO/GPO controller.
> 
> Two sets of GPIOs are provided by the device:
> - Up to 8 GPIOs, shared with the PWM and rotary encoder functionalities.
>   These GPIOs also provide interrupts on input changes.
> - Up to 6 GPOs, on unused keypad columns pins.

...

> +	for (unsigned int i = 0; i < MAX7360_MAX_GPIO; ++i) {

Is there any special reaso to use pre-increment?

> +		ret = regmap_assign_bits(regmap, MAX7360_REG_PWMCFG(i),
> +					 MAX7360_PORT_CFG_INTERRUPT_MASK, mask_buf & BIT(i));
> +		if (ret)
> +			return ret;
> +	}

...

> +			for (unsigned int i = 0; i < MAX7360_MAX_GPIO; i++) {

Here, for instance, post-increment works good.

> +				ret = regmap_write_bits(regmap, MAX7360_REG_PWMCFG(i),
> +							MAX7360_PORT_CFG_INTERRUPT_EDGES,
> +							MAX7360_PORT_CFG_INTERRUPT_EDGES);
> +				if (ret)
> +					return dev_err_probe(dev, ret,
> +							     "Failed to enable interrupts\n");
> +			}

-- 
With Best Regards,
Andy Shevchenko