linux-kernel - Re: [PATCH] regulator: lp8755: Fix mask for pchip->mphase

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Message-ID: <50DA7349.7080105@gmail.com>
Date:	Wed, 26 Dec 2012 12:47:21 +0900
From:	gshark <gshark.jeong@...il.com>
To:	Axel Lin <axel.lin@...ics.com>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: lp8755: Fix mask for pchip->mphase

2012년 12월 26일 11:12, Axel Lin 쓴 글:
> According to lp8755.h:
> enum lp8755_mphase_config {
>          MPHASE_CONF0,
>          MPHASE_CONF1,
>          MPHASE_CONF2,
>          MPHASE_CONF3,
>          MPHASE_CONF4,
>          MPHASE_CONF5,
>          MPHASE_CONF6,
>          MPHASE_CONF7,
>          MPHASE_CONF8,
>          MPHASE_CONF_MAX
> };
>
> MPHASE_CONF_MAX is 9, the mask for pchip->mphase should be 0x17.
> Otherwise, we cannot differentiate MPHASE_CONF0 and MPHASE_CONF8.
>
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
> ---
> Hi Daniel,
> I don't have the datasheet, can you check if this patch is correct?
>
> BTW, I'm Axel, not Alex.
>
> Regards,
> Axel
>   drivers/regulator/lp8755.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/regulator/lp8755.c b/drivers/regulator/lp8755.c
> index 06a82e2..6d5a11d 100644
> --- a/drivers/regulator/lp8755.c
> +++ b/drivers/regulator/lp8755.c
> @@ -301,7 +301,7 @@ static int lp8755_init_data(struct lp8755_chip *pchip)
>   	ret = lp8755_read(pchip, 0x3D, &regval);
>   	if (ret < 0)
>   		goto out_i2c_error;
> -	pchip->mphase = regval & 0x07;
> +	pchip->mphase = regval & 0x17;
>   
>   	/* set default data based on multi-phase config */
>   	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
Hi Axel.


According to the new datasheet, it has 9 multi-phase mode from 0 to 8 
and it takes 4bits in the register.

the mask for pchip->mphase should be 0x0F.

Thank you for your comments Axel.
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