linux-kernel - Re: [PATCH] leds: lm3642: Use regmap_update_bits() in lm3642_chip

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Date:	Mon, 24 Sep 2012 09:58:04 +0900
From:	gshark <gshark.jeong@...il.com>
To:	Axel Lin <axel.lin@...ics.com>
CC:	Bryan Wu <bryan.wu@...onical.com>,
	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: lm3642: Use regmap_update_bits() in lm3642_chip_init()

2012년 09월 22일 15:40, Axel Lin 쓴 글:
> Use regmap_update_bits() to replace regmap_read() + regmap_write().
> With this patch, we only show the error message when regmap_update_bits()
> fails.
     Looks good..You're right.  Thank you Alex.
>
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
     Acked-by: G.Shark Jeong<gshark.jeong@...il.com>
> ---
>   drivers/leds/leds-lm3642.c |   15 +++------------
>   1 file changed, 3 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c
> index 924853b..3285006 100644
> --- a/drivers/leds/leds-lm3642.c
> +++ b/drivers/leds/leds-lm3642.c
> @@ -95,23 +95,14 @@ struct lm3642_chip_data {
>   /* chip initialize */
>   static int __devinit lm3642_chip_init(struct lm3642_chip_data *chip)
>   {
> -	unsigned int reg_val;
>   	int ret;
>   	struct lm3642_platform_data *pdata = chip->pdata;
>   
>   	/* set enable register */
> -	ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
> +	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
> +				 pdata->tx_pin);
>   	if (ret < 0)
> -		goto out;
> -
> -	reg_val &= (~EX_PIN_ENABLE_MASK);
> -	reg_val |= pdata->tx_pin;
> -	ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
> -	if (ret < 0)
> -		goto out;
> -
> -out:
> -	dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
> +		dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
>   	return ret;
>   }
>   

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