linux-kernel - Re: [PATCH v2 02/10] mfd: stmpe: Add reset support for all STMPE variant

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Message-ID: <6fcee179-45e1-6480-c4da-7dbc03b1843d@st.com>
Date:	Wed, 10 Aug 2016 18:00:22 +0200
From:	Patrice Chotard <patrice.chotard@...com>
To:	Stefan Agner <stefan@...er.ch>
CC:	<lee.jones@...aro.org>, <linus.walleij@...aro.org>,
	<gnurou@...il.com>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <maxime.coquelin@...com>,
	<amelie.delaunay@...com>, <shawnguo@...nel.org>,
	<kernel@...gutronix.de>, <dinguyen@...nsource.altera.com>,
	<vireshk@...nel.org>, <shiraz.linux.kernel@...il.com>,
	<thierry.reding@...il.com>, <marcel.ziswiler@...adex.com>,
	<dev@...xeye.de>
Subject: Re: [PATCH v2 02/10] mfd: stmpe: Add reset support for all STMPE
 variant

Hi Stefan


On 08/07/2016 04:54 AM, Stefan Agner wrote:
> On 2016-04-28 05:13, patrice.chotard@...com wrote:
>> From: Patrice Chotard <patrice.chotard@...com>
>>
>> Reset was only implemented for STMPE1801 variant despite
>> all variant have a SOFT_RESET bit.
>>
>> For STMPE2401/2403/801/1601/1801 SOFT_RESET bit is bit 7
>> of SYS_CTRL register.
>> For STMPE610/811 (which have the same variant id) SOFT_RESET
>> bit is bit 1 of SYS_CTRL register.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard@...com>
>> Acked-by: Linus Walleij <linus.walleij@...aro.org>
>> Acked-by: Lee Jones <lee.jones@...aro.org>
>> ---
>>  drivers/mfd/stmpe.c | 23 +++++++++++++++--------
>>  drivers/mfd/stmpe.h |  7 +++++--
>>  2 files changed, 20 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
>> index c553b73..af682d0 100644
>> --- a/drivers/mfd/stmpe.c
>> +++ b/drivers/mfd/stmpe.c
>> @@ -735,13 +735,22 @@ static int stmpe1801_enable(struct stmpe *stmpe,
>> unsigned int blocks,
>>  				enable ? mask : 0);
>>  }
>>  
>> -static int stmpe1801_reset(struct stmpe *stmpe)
>> +static int stmpe_reset(struct stmpe *stmpe)
>>  {
>> +	u16 id_val = stmpe->variant->id_val;
>>  	unsigned long timeout;
>>  	int ret = 0;
>> +	u8 reset_bit;
>> +
>> +	if (id_val == STMPE811_ID)
>> +		/* STMPE801 and STMPE610 use bit 1 of SYS_CTRL register */
>> +		reset_bit = STMPE811_SYS_CTRL_RESET;
>> +	else
>> +		/* all other STMPE variant use bit 7 of SYS_CTRL register */
>> +		reset_bit = STMPE_SYS_CTRL_RESET;
> Wouldn't it be nicer to have this in struct stmpe_variant_info like
> id_mask...?

For information this series has just been pushed by Lee Jones.
I will have a look at your proposal and submit an update , but after my 3 weeks of vacations ;-)

Thanks

Patrice