linux-kernel - RE: [PATCH v8 5/6] regulator: pfuze100-regulator: provide pm_power_off

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Date:   Mon, 6 Aug 2018 02:51:38 +0000
From:   Robin Gong <yibin.gong@....com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Leonard Crestez <leonard.crestez@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Russell King <linux@...linux.org.uk>,
        dl-linux-imx <linux-imx@....com>,
        "A.s. Dong" <aisheng.dong@....com>
Subject: RE: [PATCH v8 5/6] regulator: pfuze100-regulator: provide
 pm_power_off_prepare handler

> >> +static struct pfuze_chip *syspm_pfuze_chip;
> >> +
> >> +static void pfuze_power_off_prepare(void)
> >> +	dev_info(syspm_pfuze_chip->dev, "Configure standy mode for power
> >> +off");
> > Add 'if (syspm_pfuze_chip ->chip_id == PFUZE100))' here is easy for
> > extend Support on pfuze200/3000.. in the feature.
> There is already:
> static int pfuze_power_off_prepare_init(struct pfuze_chip *pfuze_chip) {
>         if (pfuze_chip->chip_id != PFUZE100) {
>                 dev_warn(pfuze_chip->dev, "Requested
> pm_power_off_prepare handler for not supported chip\n");
>                 return -ENODEV;
>         }
> 
> 
> No need to add it in pfuze_power_off_prepare()
I saw you add chip check in pfuze_power_off_prepare_init(), but I'm saying
In the future case pfuze200/3000 may should still support this feature, but registers
are different between different chips, thus, move checking chip into pfuze_power_off_prepare()
could make the later patch for pfuze200/3000 more clear, less and easier.