linux-kernel - Re: [PATCH 3/5] iTCO_wdt: Add support for TCO on Intel Sunrisepoint

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Message-ID: <20150728101314.GG2492@codeblueprint.co.uk>
Date:	Tue, 28 Jul 2015 11:13:14 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org,
	linux-watchdog@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Jean Delvare <jdelvare@...e.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 3/5] iTCO_wdt: Add support for TCO on Intel Sunrisepoint

On Mon, 27 Jul, at 07:22:51AM, Guenter Roeck wrote:
> On 07/27/2015 06:38 AM, Matt Fleming wrote:
> >From: Matt Fleming <matt.fleming@...el.com>
> >
> >The revision of the watchdog hardware in Sunrisepoint necessitates a new
> >"version" inside the TCO watchdog driver because some of the register
> >layouts have changed.
> >
> >Cc: Wim Van Sebroeck <wim@...ana.be>
> >Signed-off-by: Matt Fleming <matt.fleming@...el.com>
> >---
> >  drivers/watchdog/iTCO_wdt.c | 58 ++++++++++++++++++++++++++-------------------
> >  1 file changed, 34 insertions(+), 24 deletions(-)
> >
> >diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> >index 9a6e70976f64..17dfbc51b85a 100644
> >--- a/drivers/watchdog/iTCO_wdt.c
> >+++ b/drivers/watchdog/iTCO_wdt.c
> >@@ -145,58 +145,65 @@ static inline unsigned int ticks_to_seconds(int ticks)
> >  	return iTCO_wdt_private.iTCO_version == 3 ? ticks : (ticks * 6) / 10;
> >  }
> >
> >+static inline u32 no_reboot_bit(void)
> >+{
> >+	u32 enable_bit;
> >+
> >+	switch (iTCO_wdt_private.iTCO_version) {
> >+	case 3:
> >+		enable_bit = 0x00000010;
> >+		break;
> >+	case 2:
> >+		enable_bit = 0x00000020;
> >+		break;
> >+	default:
> >+		enable_bit = 0x00000002;
> 
> I think it would be better to explicitly list versions 1 and 4 here,
> for clarification. We don't know what Intel will come up with for version 5,
> and by then no one will remember that bit 2 applies for version 1 and 4 only.

Sure, that makes sense. I'll update the patch.

-- 
Matt Fleming, Intel Open Source Technology Center
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