linux-kernel - Re: [PATCH v2 2/2] pinctrl: renesas: rzg2l: Add suspend/resume support

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Message-ID: <CAMuHMdXenTZWS5NsOS_rwXp5+4K6zK3cv8z7ev46Sp4nTLTMMQ@mail.gmail.com>
Date: Wed, 21 Feb 2024 15:18:19 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: linus.walleij@...aro.org, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v2 2/2] pinctrl: renesas: rzg2l: Add suspend/resume support

Hi Claudiu,

On Thu, Feb 15, 2024 at 1:41 PM Claudiu <claudiu.beznea@...on.dev> 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>
> ---
>
> Changes in v2:
> - use u8 for sd_ch, eth_poc, eth_mode, qspi members of
>   struct rzg2l_pinctrl_reg_cache and readb()/writeb() where necessary
> - s/wakeup_source/wakeup_path/g
> - call device_set_wakeup_path() on suspend
> - call irq_chip_set_wake_parent() on rzg2l_gpio_irq_set_wake()

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
i.e. will queue in renesas-pinctrl for v6.9.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds