linux-kernel - Re: [PATCH v4 06/11] gpio: regmap: add the .fixed_direction

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Message-Id: <DCWTIV3281OX.1N3AA8K3T21LY@kernel.org>
Date: Fri, 19 Sep 2025 15:41:00 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Ioana Ciornei" <ioana.ciornei@....com>, "Rob Herring"
 <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor
 Dooley" <conor+dt@...nel.org>, "Linus Walleij" <linus.walleij@...aro.org>,
 "Bartosz Golaszewski" <brgl@...ev.pl>, "Shawn Guo" <shawnguo@...nel.org>,
 "Lee Jones" <lee@...nel.org>, <devicetree@...r.kernel.org>,
 <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc: "Frank Li" <Frank.Li@....com>
Subject: Re: [PATCH v4 06/11] gpio: regmap: add the .fixed_direction_output
 configuration parameter

Hi,

> @@ -129,6 +130,13 @@ static int gpio_regmap_get_direction(struct gpio_chip *chip,
>  	unsigned int base, val, reg, mask;
>  	int invert, ret;
>  
> +	if (gpio->fixed_direction_output) {
> +		if (test_bit(offset, gpio->fixed_direction_output))
> +			return GPIO_LINE_DIRECTION_OUT;
> +		else
> +			return GPIO_LINE_DIRECTION_IN;
> +	}
> +
>  	if (gpio->reg_dat_base && !gpio->reg_set_base)
>  		return GPIO_LINE_DIRECTION_IN;
>  	if (gpio->reg_set_base && !gpio->reg_dat_base)
> @@ -277,6 +285,17 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
>  			return ERR_PTR(ret);

Not related to your patch, but this line above is wrong. That should
be "goto err_free_gpio". Would you mind adding a patch for it? I
could do it myself, but it will probably conflict with this series.
I'm fine either way (if you do it, don't forget the Fixes: tag).

>  	}
>  
> +	if (config->fixed_direction_output) {
> +		gpio->fixed_direction_output = bitmap_alloc(chip->ngpio,
> +							    GFP_KERNEL);
> +		if (!gpio->fixed_direction_output) {
> +			ret = -ENOMEM;
> +			goto err_free_gpio;
> +		}
> +		bitmap_copy(gpio->fixed_direction_output,
> +			    config->fixed_direction_output, chip->ngpio);
> +	}
> +
>  	/* if not set, assume there is only one register */
>  	gpio->ngpio_per_reg = config->ngpio_per_reg;
>  	if (!gpio->ngpio_per_reg)
> @@ -293,7 +312,7 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
>  
>  	ret = gpiochip_add_data(chip, gpio);
>  	if (ret < 0)
> -		goto err_free_gpio;
> +		goto err_free_bitmap;

There's also an err_free_gpio jump below, that should also be
replaced with err_free_bitmap.

Otherwise looks good.

-michael

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