linux-kernel - Re: [PATCH v2 1/2] power: reset: at91-poweroff: introduce struct shdwc_reg

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Message-ID: <b7618ccceecacc45565854b5a038fe044aad85e5.camel@microchip.com>
Date:   Fri, 20 Dec 2019 15:42:10 +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 1/2] power: reset: at91-poweroff: introduce struct
 shdwc_reg_config

Le vendredi 20 décembre 2019 à 17:31 +0200, Claudiu Beznea a écrit :
> This driver uses AT91_PMC_MCKR in poweroff() function. But the
> SAM9X60's PMC versions maps AT91_PMC_MCKR functionality at different
> offset compared to the SAMA5D2's one. This patch prepares the field
> so that different AT91_PMC_MCKR's offsets to be introduced in
> struct reg_config so that proper offset to be used for AT91_PMC_MCKR
> based on compatible string.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

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

> ---
>  drivers/power/reset/at91-sama5d2_shdwc.c | 54 +++++++++++++++++++--------
> -----
>  1 file changed, 32 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/power/reset/at91-sama5d2_shdwc.c
> b/drivers/power/reset/at91-sama5d2_shdwc.c
> index 1c18f465a245..84806d20846b 100644
> --- a/drivers/power/reset/at91-sama5d2_shdwc.c
> +++ b/drivers/power/reset/at91-sama5d2_shdwc.c
> @@ -66,7 +66,7 @@
>  
>  #define SHDW_CFG_NOT_USED	(32)
>  
> -struct shdwc_config {
> +struct shdwc_reg_config {
>  	u8 wkup_pin_input;
>  	u8 mr_rtcwk_shift;
>  	u8 mr_rttwk_shift;
> @@ -74,8 +74,12 @@ struct shdwc_config {
>  	u8 sr_rttwk_shift;
>  };
>  
> +struct reg_config {
> +	struct shdwc_reg_config shdwc;
> +};
> +
>  struct shdwc {
> -	const struct shdwc_config *cfg;
> +	const struct reg_config *rcfg;
>  	struct clk *sclk;
>  	void __iomem *shdwc_base;
>  	void __iomem *mpddrc_base;
> @@ -95,6 +99,7 @@ static const unsigned long long sdwc_dbc_period[] = {
>  static void __init at91_wakeup_status(struct platform_device *pdev)
>  {
>  	struct shdwc *shdw = platform_get_drvdata(pdev);
> +	const struct reg_config *rcfg = shdw->rcfg;
>  	u32 reg;
>  	char *reason = "unknown";
>  
> @@ -106,11 +111,11 @@ static void __init at91_wakeup_status(struct
> platform_device *pdev)
>  	if (!reg)
>  		return;
>  
> -	if (SHDW_WK_PIN(reg, shdw->cfg))
> +	if (SHDW_WK_PIN(reg, &rcfg->shdwc))
>  		reason = "WKUP pin";
> -	else if (SHDW_RTCWK(reg, shdw->cfg))
> +	else if (SHDW_RTCWK(reg, &rcfg->shdwc))
>  		reason = "RTC";
> -	else if (SHDW_RTTWK(reg, shdw->cfg))
> +	else if (SHDW_RTTWK(reg, &rcfg->shdwc))
>  		reason = "RTT";
>  
>  	pr_info("AT91: Wake-Up source: %s\n", reason);
> @@ -215,6 +220,7 @@ static u32 at91_shdwc_get_wakeup_input(struct
> platform_device *pdev,
>  static void at91_shdwc_dt_configure(struct platform_device *pdev)
>  {
>  	struct shdwc *shdw = platform_get_drvdata(pdev);
> +	const struct reg_config *rcfg = shdw->rcfg;
>  	struct device_node *np = pdev->dev.of_node;
>  	u32 mode = 0, tmp, input;
>  
> @@ -227,10 +233,10 @@ static void at91_shdwc_dt_configure(struct
> platform_device *pdev)
>  		mode |= AT91_SHDW_WKUPDBC(at91_shdwc_debouncer_value(pdev,
> tmp));
>  
>  	if (of_property_read_bool(np, "atmel,wakeup-rtc-timer"))
> -		mode |= SHDW_RTCWKEN(shdw->cfg);
> +		mode |= SHDW_RTCWKEN(&rcfg->shdwc);
>  
>  	if (of_property_read_bool(np, "atmel,wakeup-rtt-timer"))
> -		mode |= SHDW_RTTWKEN(shdw->cfg);
> +		mode |= SHDW_RTTWKEN(&rcfg->shdwc);
>  
>  	dev_dbg(&pdev->dev, "%s: mode = %#x\n", __func__, mode);
>  	writel(mode, shdw->shdwc_base + AT91_SHDW_MR);
> @@ -239,30 +245,34 @@ static void at91_shdwc_dt_configure(struct
> platform_device *pdev)
>  	writel(input, shdw->shdwc_base + AT91_SHDW_WUIR);
>  }
>  
> -static const struct shdwc_config sama5d2_shdwc_config = {
> -	.wkup_pin_input = 0,
> -	.mr_rtcwk_shift = 17,
> -	.mr_rttwk_shift	= SHDW_CFG_NOT_USED,
> -	.sr_rtcwk_shift = 5,
> -	.sr_rttwk_shift = SHDW_CFG_NOT_USED,
> +static const struct reg_config sama5d2_reg_config = {
> +	.shdwc = {
> +		.wkup_pin_input = 0,
> +		.mr_rtcwk_shift = 17,
> +		.mr_rttwk_shift	= SHDW_CFG_NOT_USED,
> +		.sr_rtcwk_shift = 5,
> +		.sr_rttwk_shift = SHDW_CFG_NOT_USED,
> +	},
>  };
>  
> -static const struct shdwc_config sam9x60_shdwc_config = {
> -	.wkup_pin_input = 0,
> -	.mr_rtcwk_shift = 17,
> -	.mr_rttwk_shift = 16,
> -	.sr_rtcwk_shift = 5,
> -	.sr_rttwk_shift = 4,
> +static const struct reg_config sam9x60_reg_config = {
> +	.shdwc = {
> +		.wkup_pin_input = 0,
> +		.mr_rtcwk_shift = 17,
> +		.mr_rttwk_shift = 16,
> +		.sr_rtcwk_shift = 5,
> +		.sr_rttwk_shift = 4,
> +	},
>  };
>  
>  static const struct of_device_id at91_shdwc_of_match[] = {
>  	{
>  		.compatible = "atmel,sama5d2-shdwc",
> -		.data = &sama5d2_shdwc_config,
> +		.data = &sama5d2_reg_config,
>  	},
>  	{
>  		.compatible = "microchip,sam9x60-shdwc",
> -		.data = &sam9x60_shdwc_config,
> +		.data = &sam9x60_reg_config,
>  	}, {
>  		/*sentinel*/
>  	}
> @@ -303,7 +313,7 @@ static int __init at91_shdwc_probe(struct
> platform_device *pdev)
>  	}
>  
>  	match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node);
> -	at91_shdwc->cfg = match->data;
> +	at91_shdwc->rcfg = match->data;
>  
>  	at91_shdwc->sclk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(at91_shdwc->sclk))