[PATCH v3 11/21] ARM: at91: PM: Add Backup mode for SAMA7D65

[claudiu beznea (tuxon)]

On 2/27/25 17:51, Ryan.Wanner at microchip.com wrote:
> From: Ryan Wanner <Ryan.Wanner at microchip.com>
> 
> Add config check that enables Backup mode for SAMA7D65 SoC.
> 
> Add SHDWC_SR read to clear the status bits once finished exiting backup
> mode. This is only for SAMA7D65 SoCs. The SHDWC status register
> needs to be cleared after exiting backup mode to clear the wake up pin
> status.
> 
> Signed-off-by: Ryan Wanner <Ryan.Wanner at microchip.com>
> ---
>   arch/arm/mach-at91/pm.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 39644703244d..d82a507bc8da 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -647,6 +647,11 @@ static void at91_pm_suspend(suspend_state_t state)
>   		at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
>   					     &at91_pm_suspend_in_sram,
>   					     at91_pm_suspend_in_sram_sz);
> +
> +		if (IS_ENABLED(CONFIG_SOC_SAMA7D65))
> +			/* SHDWC.SR */
> +			readl(soc_pm.data.shdwc + 0x08);
> +
>   	} else {
>   		at91_suspend_finish(0);
>   	}
> @@ -707,6 +712,7 @@ static int at91_pm_enter(suspend_state_t state)
>   static void at91_pm_end(void)
>   {
>   	at91_pm_config_ws(soc_pm.data.mode, false);
> +

Not needed. I'll drop it while applying.

>   }
>   
>   
> @@ -1065,7 +1071,8 @@ static int __init at91_pm_backup_init(void)
>   	int ret = -ENODEV, located = 0;
>   
>   	if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) &&
> -	    !IS_ENABLED(CONFIG_SOC_SAMA7G5))
> +	    !IS_ENABLED(CONFIG_SOC_SAMA7G5) &&
> +	    !IS_ENABLED(CONFIG_SOC_SAMA7D65))
>   		return -EPERM;
>   
>   	if (!at91_is_pm_mode_active(AT91_PM_BACKUP))