linux-kernel - Re: [PATCH v5 3/6] watchdog: iTCO_wdt: Add PMC specific noreboot update api

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Date:   Tue, 4 Apr 2017 16:48:59 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Andy Shevchenko <andy@...radead.org>,
        Zha Qipeng <qipeng.zha@...el.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ana.be>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        David Box <david.e.box@...ux.intel.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v5 3/6] watchdog: iTCO_wdt: Add PMC specific noreboot
 update api

On Tue, Apr 4, 2017 at 3:24 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
> In some SoCs, setting noreboot bit needs modification to
> PMC GC registers. But not all PMC drivers allow other drivers
> to memory map their GC region. This could create mem request
> conflict in watchdog driver. So this patch adds facility to allow
> PMC drivers to pass noreboot update function to watchdog
> drivers via platform data.

>         /* Set the NO_REBOOT bit: this disables reboots */
>         if (p->iTCO_version >= 2) {
> -               val32 = readl(p->gcs_pmc);
> -               val32 |= no_reboot_bit(p);
> -               writel(val32, p->gcs_pmc);
> +               if (p->update_noreboot_flag)
> +                       p->update_noreboot_flag(true);
> +               else {
> +                       val32 = readl(p->gcs_pmc);
> +                       val32 |= no_reboot_bit(p);
> +                       writel(val32, p->gcs_pmc);
> +               }

What I meant is to introduce helper(s) first and then fix this. Yes, I
understand it might increase work for backporting (if even needed),
but I still think it worth doing.

-- 
With Best Regards,
Andy Shevchenko