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

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Message-ID: <8798334c6e5272a08ed665f7fc649fd1@agner.ch>
Date:	Sat, 06 Aug 2016 19:54:03 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	patrice.chotard@...com
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

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...?

--
Stefan

>  
>  	ret = __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL],
> -		STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
> +			       reset_bit, reset_bit);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -750,7 +759,7 @@ static int stmpe1801_reset(struct stmpe *stmpe)
>  		ret = __stmpe_reg_read(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL]);
>  		if (ret < 0)
>  			return ret;
> -		if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
> +		if (!(ret & reset_bit))
>  			return 0;
>  		usleep_range(100, 200);
>  	}
> @@ -1074,11 +1083,9 @@ static int stmpe_chip_init(struct stmpe *stmpe)
>  	if (ret)
>  		return ret;
>  
> -	if (id == STMPE1801_ID)	{
> -		ret =  stmpe1801_reset(stmpe);
> -		if (ret < 0)
> -			return ret;
> -	}
> +	ret =  stmpe_reset(stmpe);
> +	if (ret < 0)
> +		return ret;
>  
>  	if (stmpe->irq >= 0) {
>  		if (id == STMPE801_ID)
> diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
> index 406f9f2..4ae343d 100644
> --- a/drivers/mfd/stmpe.h
> +++ b/drivers/mfd/stmpe.h
> @@ -104,6 +104,8 @@ int stmpe_remove(struct stmpe *stmpe);
>  #define STMPE_ICR_LSB_EDGE	(1 << 1)
>  #define STMPE_ICR_LSB_GIM	(1 << 0)
>  
> +#define STMPE_SYS_CTRL_RESET	(1 << 7)
> +
>  /*
>   * STMPE801
>   */
> @@ -126,6 +128,7 @@ int stmpe_remove(struct stmpe *stmpe);
>  /*
>   * STMPE811
>   */
> +#define STMPE811_ID			0x0811
>  
>  #define STMPE811_IRQ_TOUCH_DET		0
>  #define STMPE811_IRQ_FIFO_TH		1
> @@ -155,6 +158,8 @@ int stmpe_remove(struct stmpe *stmpe);
>  #define STMPE811_REG_GPIO_FE		0x16
>  #define STMPE811_REG_GPIO_AF		0x17
>  
> +#define STMPE811_SYS_CTRL_RESET		(1 << 1)
> +
>  #define STMPE811_SYS_CTRL2_ADC_OFF	(1 << 0)
>  #define STMPE811_SYS_CTRL2_TSC_OFF	(1 << 1)
>  #define STMPE811_SYS_CTRL2_GPIO_OFF	(1 << 2)
> @@ -244,8 +249,6 @@ int stmpe_remove(struct stmpe *stmpe);
>  #define STMPE1801_REG_GPIO_PULL_UP_MID		0x23
>  #define STMPE1801_REG_GPIO_PULL_UP_HIGH		0x24
>  
> -#define STMPE1801_MSK_SYS_CTRL_RESET		(1 << 7)
> -
>  #define STMPE1801_MSK_INT_EN_KPC		(1 << 1)
>  #define STMPE1801_MSK_INT_EN_GPIO		(1 << 3)