linux-kernel - Re: [PATCH v3 6/7] gpio: exar: switch to using regmap

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Message-ID: <20201110142624.GT4077@smile.fi.intel.com>
Date:   Tue, 10 Nov 2020 16:26:24 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        David Laight <David.Laight@...lab.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3 6/7] gpio: exar: switch to using regmap

On Tue, Nov 10, 2020 at 01:34:05PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> We can simplify the code in gpio-exar by using regmap. This allows us to
> drop the mutex (regmap provides its own locking) and we can also reuse
> regmap's bit operations instead of implementing our own update function.

...

> +	/*
> +	 * We don't need to check the return values of mmio regmap operations (unless
> +	 * the regmap has a clock attached which is not the case here).
> +	 */
> +	exar_gpio->regs = devm_regmap_init_mmio(dev, p, &exar_regmap_config);
> +	if (IS_ERR(exar_gpio->regs))
> +		return PTR_ERR(exar_gpio->regs);
>  
>  	index = ida_alloc(&ida_index, GFP_KERNEL);
> -	if (index < 0) {
> -		ret = index;
> -		goto err_mutex_destroy;
> -	}
> +	if (index < 0)
> +		return index;

And below you effectively use p as regmap!
That's what renaming of variable regs -> regmap or map can easily reveal.

	exar_gpio->regs = p;


-- 
With Best Regards,
Andy Shevchenko