linux-kernel - Re: [PATCH 1/2] pinctrl: renesas: rzg2l: Add suspend/resume support

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Date: Fri, 9 Feb 2024 07:54:49 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be, magnus.damm@...il.com, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 linus.walleij@...aro.org
Cc: linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 1/2] pinctrl: renesas: rzg2l: Add suspend/resume support



On 08.02.2024 15:56, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> pinctrl-rzg2l driver is used on RZ/G3S which support deep sleep states
> where power to most of the SoC components is turned off.
> 
> For this add suspend/resume support. This involves saving and restoring
> configured registers along with disabling clock in case there is no pin
> configured as wakeup sources.
> 
> To save/restore registers 2 caches were allocated: one for GPIO pins and
> one for dedicated pins.
> 
> On suspend path the pin controller registers are saved and if none of the
> pins are configured as wakeup sources the pinctrl clock is disabled.
> Otherwise it remains on.
> 
> On resume path the configuration is done as follows:
> 1/ setup PFCs by writing to registers on pin based accesses
> 2/ setup GPIOs by writing to registers on port based accesses and
>    following configuration steps specified in hardware manual
> 3/ setup dedicated pins by writing to registers on port based accesses
> 4/ setup interrupts.
> 
> Because interrupt signals are routed to IA55 interrupt controller and
> IA55 interrupt controller resumes before pin controller, patch restores
> also the configured interrupts just after pin settings are restored to
> avoid invalid interrupts while resuming.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
[ ... ]

>  
> +/**
> + * struct rzg2l_pinctrl_reg_cache - register cache structure (to be used in suspend/resume)
> + * @p: P registers cache
> + * @pm: PM registers cache
> + * @pmc: PMC registers cache
> + * @pfc: PFC registers cache
> + * @iolh: IOLH registers cache
> + * @ien: IEN registers cache
> + * @sd_ch: SD_CH registers cache
> + * @eth_poc: ET_POC registers cache
> + * @eth_mode: ETH_MODE register cache
> + * @qspi: QSPI registers cache
> + */
> +struct rzg2l_pinctrl_reg_cache {
> +	u8	*p;
> +	u16	*pm;
> +	u8	*pmc;
> +	u32	*pfc;
> +	u32	*iolh[2];
> +	u32	*ien[2];


> +	u32	sd_ch[2];
> +	u32	eth_poc[2];
> +	u32	eth_mode;
> +	u32	qspi;

I missed it, u8 should be enough for these.

[ ... ]