linux-kernel - Re: [PATCH v2 1/2] clk: at91: cleanup PMC header file for PCR register fields

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Message-ID: <20150617163753.45e66247@bbrezillon>
Date:	Wed, 17 Jun 2015 16:37:53 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Josh Wu <josh.wu@...el.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <mturquette@...aro.org>
Subject: Re: [PATCH v2 1/2] clk: at91: cleanup PMC header file for PCR
 register fields

On Wed, 17 Jun 2015 14:40:38 +0200
Nicolas Ferre <nicolas.ferre@...el.com> wrote:

> Add _MASK and _OFFSET values and cleanup register fields layout.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---
>  drivers/clk/at91/clk-peripheral.c |  8 ++++----
>  include/linux/clk/at91_pmc.h      | 14 ++++++--------
>  2 files changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c
> index 597fed423d7d..61d0adda7088 100644
> --- a/drivers/clk/at91/clk-peripheral.c
> +++ b/drivers/clk/at91/clk-peripheral.c
> @@ -165,7 +165,7 @@ static int clk_sam9x5_peripheral_enable(struct clk_hw *hw)
>  	if (periph->id < PERIPHERAL_ID_MIN)
>  		return 0;
>  
> -	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID) |
> +	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK) |
>  				     AT91_PMC_PCR_CMD |
>  				     AT91_PMC_PCR_DIV(periph->div) |
>  				     AT91_PMC_PCR_EN);
> @@ -180,7 +180,7 @@ static void clk_sam9x5_peripheral_disable(struct clk_hw *hw)
>  	if (periph->id < PERIPHERAL_ID_MIN)
>  		return;
>  
> -	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID) |
> +	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK) |
>  				     AT91_PMC_PCR_CMD);
>  }
>  
> @@ -194,7 +194,7 @@ static int clk_sam9x5_peripheral_is_enabled(struct clk_hw *hw)
>  		return 1;
>  
>  	pmc_lock(pmc);
> -	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID));
> +	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
>  	ret = !!(pmc_read(pmc, AT91_PMC_PCR) & AT91_PMC_PCR_EN);
>  	pmc_unlock(pmc);
>  
> @@ -213,7 +213,7 @@ clk_sam9x5_peripheral_recalc_rate(struct clk_hw *hw,
>  		return parent_rate;
>  
>  	pmc_lock(pmc);
> -	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID));
> +	pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
>  	tmp = pmc_read(pmc, AT91_PMC_PCR);
>  	pmc_unlock(pmc);
>  
> diff --git a/include/linux/clk/at91_pmc.h b/include/linux/clk/at91_pmc.h
> index 7669f7618f39..dfc59e2b64fb 100644
> --- a/include/linux/clk/at91_pmc.h
> +++ b/include/linux/clk/at91_pmc.h
> @@ -182,13 +182,11 @@ extern void __iomem *at91_pmc_base;
>  #define AT91_PMC_PCSR1		0x108			/* Peripheral Clock Enable Register 1 */
>  
>  #define AT91_PMC_PCR		0x10c			/* Peripheral Control Register [some SAM9 and SAMA5] */
> -#define		AT91_PMC_PCR_PID	(0x3f  <<  0)		/* Peripheral ID */
> -#define		AT91_PMC_PCR_CMD	(0x1  <<  12)		/* Command (read=0, write=1) */
> -#define		AT91_PMC_PCR_DIV(n)	((n)  <<  16)		/* Divisor Value */
> -#define			AT91_PMC_PCR_DIV0	0x0			/* Peripheral clock is MCK */
> -#define			AT91_PMC_PCR_DIV2	0x1			/* Peripheral clock is MCK/2 */
> -#define			AT91_PMC_PCR_DIV4	0x2			/* Peripheral clock is MCK/4 */
> -#define			AT91_PMC_PCR_DIV8	0x3			/* Peripheral clock is MCK/8 */
> -#define		AT91_PMC_PCR_EN		(0x1  <<  28)		/* Enable */
> +#define		AT91_PMC_PCR_PID_MASK		0x3f
> +#define		AT91_PMC_PCR_CMD		(0x1  <<  12)				/* Command (read=0, write=1) */
> +#define		AT91_PMC_PCR_DIV_OFFSET		16
> +#define		AT91_PMC_PCR_DIV_MASK		(0x3  << AT91_PMC_PCR_DIV_OFFSET)
> +#define		AT91_PMC_PCR_DIV(n)		((n)  << AT91_PMC_PCR_DIV_OFFSET)	/* Divisor Value */
> +#define		AT91_PMC_PCR_EN			(0x1  <<  28)				/* Enable */
>  
>  #endif



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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