linux-kernel - Re: [PATCH 3/4] ARM: at91: pm: Remove 2.5V regulator

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Message-ID: <36a37379-2ad1-40c5-9c7d-6e05ea74bf84@microchip.com>
Date: Tue, 16 Sep 2025 16:48:18 +0200
From: Nicolas Ferre <nicolas.ferre@...rochip.com>
To: <Ryan.Wanner@...rochip.com>, <claudiu.beznea@...on.dev>, <sre@...nel.org>,
	<robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<alexandre.belloni@...tlin.com>, <linux@...linux.org.uk>
CC: <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] ARM: at91: pm: Remove 2.5V regulator

On 10/09/2025 at 18:20, Ryan.Wanner@...rochip.com wrote:
> From: Ryan Wanner <Ryan.Wanner@...rochip.com>
> 
> Remove 2.5V regulator since enabling and disabling this regulator is no
> longer supported.
> 
> Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>

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

I take this one for at91-soc now. We will come back for the rest.

Regards,
   Nicolas

> ---
>   arch/arm/mach-at91/pm_suspend.S | 29 -----------------------------
>   include/soc/at91/sama7-sfrbu.h  |  7 -------
>   2 files changed, 36 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
> index 198236bdbbb3..36cae7b1a490 100644
> --- a/arch/arm/mach-at91/pm_suspend.S
> +++ b/arch/arm/mach-at91/pm_suspend.S
> @@ -87,29 +87,6 @@ tmp3	.req	r6
>   
>   	.endm
>   
> -/**
> - * Set state for 2.5V low power regulator
> - * @ena: 0 - disable regulator
> - *	 1 - enable regulator
> - *
> - * Side effects: overwrites r7, r8, r9, r10
> - */
> -	.macro at91_2_5V_reg_set_low_power ena
> -#ifdef CONFIG_SOC_SAMA7
> -	ldr	r7, .sfrbu
> -	mov	r8, #\ena
> -	ldr	r9, [r7, #AT91_SFRBU_25LDOCR]
> -	orr	r9, r9, #AT91_SFRBU_25LDOCR_LP
> -	cmp	r8, #1
> -	beq	lp_done_\ena
> -	bic	r9, r9, #AT91_SFRBU_25LDOCR_LP
> -lp_done_\ena:
> -	ldr	r10, =AT91_SFRBU_25LDOCR_LDOANAKEY
> -	orr	r9, r9, r10
> -	str	r9, [r7, #AT91_SFRBU_25LDOCR]
> -#endif
> -	.endm
> -
>   /*
>    * Set LPM
>    * @ena: 0 - disable LPM
> @@ -1055,9 +1032,6 @@ save_mck:
>   
>   	at91_plla_disable
>   
> -	/* Enable low power mode for 2.5V regulator. */
> -	at91_2_5V_reg_set_low_power 1
> -
>   	ldr	tmp3, .pm_mode
>   	cmp	tmp3, #AT91_PM_ULP1
>   	beq	ulp1_mode
> @@ -1070,9 +1044,6 @@ ulp1_mode:
>   	b	ulp_exit
>   
>   ulp_exit:
> -	/* Disable low power mode for 2.5V regulator. */
> -	at91_2_5V_reg_set_low_power 0
> -
>   	ldr	pmc, .pmc_base
>   
>   	at91_plla_enable
> diff --git a/include/soc/at91/sama7-sfrbu.h b/include/soc/at91/sama7-sfrbu.h
> index 76b740810d34..8cee48d1ae2c 100644
> --- a/include/soc/at91/sama7-sfrbu.h
> +++ b/include/soc/at91/sama7-sfrbu.h
> @@ -18,13 +18,6 @@
>   #define		AT91_SFRBU_PSWBU_SOFTSWITCH	(1 << 1)	/* Power switch BU source selection */
>   #define		AT91_SFRBU_PSWBU_CTRL		(1 << 0)	/* Power switch BU control */
>   
> -#define AT91_SFRBU_25LDOCR			(0x0C)		/* SFRBU 2.5V LDO Control Register */
> -#define		AT91_SFRBU_25LDOCR_LDOANAKEY	(0x3B6E18 << 8)	/* Specific value mandatory to allow writing of other register bits. */
> -#define		AT91_SFRBU_25LDOCR_STATE	(1 << 3)	/* LDOANA Switch On/Off Control */
> -#define		AT91_SFRBU_25LDOCR_LP		(1 << 2)	/* LDOANA Low-Power Mode Control */
> -#define		AT91_SFRBU_PD_VALUE_MSK		(0x3)
> -#define		AT91_SFRBU_25LDOCR_PD_VALUE(v)	((v) & AT91_SFRBU_PD_VALUE_MSK)	/* LDOANA Pull-down value */
> -
>   #define AT91_FRBU_DDRPWR			(0x10)		/* SFRBU DDR Power Control Register */
>   #define		AT91_FRBU_DDRPWR_STATE		(1 << 0)	/* DDR Power Mode State */
>