linux-kernel - Re: [PATCH v2 2/2] power: reset: at91-poweroff: use proper master clock register offset

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Date:   Fri, 20 Dec 2019 15:42:52 +0000
From:   <Nicolas.Ferre@...rochip.com>
To:     <Claudiu.Beznea@...rochip.com>, <sre@...nel.org>,
        <alexandre.belloni@...tlin.com>
CC:     <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] power: reset: at91-poweroff: use proper master
 clock register offset

Le vendredi 20 décembre 2019 à 17:31 +0200, Claudiu Beznea a écrit :
> SAM9X60's PMC uses different offset for master clock register.
> Add a member of type struct pmc_reg_config in struct reg_config,
> fill it correspondingly for SAMA5D2 and SAM9X60 and use it in
> poweroff() function.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

> ---
>  drivers/power/reset/at91-sama5d2_shdwc.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/reset/at91-sama5d2_shdwc.c
> b/drivers/power/reset/at91-sama5d2_shdwc.c
> index 84806d20846b..2fe3a627cb53 100644
> --- a/drivers/power/reset/at91-sama5d2_shdwc.c
> +++ b/drivers/power/reset/at91-sama5d2_shdwc.c
> @@ -74,8 +74,13 @@ struct shdwc_reg_config {
>  	u8 sr_rttwk_shift;
>  };
>  
> +struct pmc_reg_config {
> +	u8 mckr;
> +};
> +
>  struct reg_config {
>  	struct shdwc_reg_config shdwc;
> +	struct pmc_reg_config pmc;
>  };
>  
>  struct shdwc {
> @@ -136,9 +141,9 @@ static void at91_poweroff(void)
>  		"	str	%1, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
>  
>  		/* Switch the master clock source to slow clock. */
> -		"1:	ldr	r6, [%4, #" __stringify(AT91_PMC_MCKR)
> "]\n\t"
> +		"1:	ldr	r6, [%4, %5]\n\t"
>  		"	bic	r6, r6,  #" __stringify(AT91_PMC_CSS) "\n\t"
> -		"	str	r6, [%4, #" __stringify(AT91_PMC_MCKR) "]\n\t"
> +		"	str	r6, [%4, %5]\n\t"
>  		/* Wait for clock switch. */
>  		"2:	ldr	r6, [%4, #" __stringify(AT91_PMC_SR) "]\n\t"
>  		"	tst	r6, #"	    __stringify(AT91_PMC_MCKRDY) "\n\t"
> @@ -153,7 +158,8 @@ static void at91_poweroff(void)
>  		  "r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF),
>  		  "r" (at91_shdwc->shdwc_base),
>  		  "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW),
> -		  "r" (at91_shdwc->pmc_base)
> +		  "r" (at91_shdwc->pmc_base),
> +		  "r" (at91_shdwc->rcfg->pmc.mckr)
>  		: "r6");
>  }
>  
> @@ -253,6 +259,9 @@ static const struct reg_config sama5d2_reg_config = {
>  		.sr_rtcwk_shift = 5,
>  		.sr_rttwk_shift = SHDW_CFG_NOT_USED,
>  	},
> +	.pmc = {
> +		.mckr		= 0x30,
> +	},
>  };
>  
>  static const struct reg_config sam9x60_reg_config = {
> @@ -263,6 +272,9 @@ static const struct reg_config sam9x60_reg_config = {
>  		.sr_rtcwk_shift = 5,
>  		.sr_rttwk_shift = 4,
>  	},
> +	.pmc = {
> +		.mckr		= 0x28,
> +	},
>  };
>  
>  static const struct of_device_id at91_shdwc_of_match[] = {