linux-kernel - Re: [PATCH] pinctrl: mvebu: armada-38x: add suspend/resume support

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Message-ID: <20151018160123.6694b4be@free-electrons.com>
Date:	Sun, 18 Oct 2015 16:01:23 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Grzegorz Jaszczyk <jaz@...ihalf.com>, linus.walleij@...aro.org,
	linux-kernel@...r.kernel.org, nadavh@...vell.com,
	linux-gpio@...r.kernel.org, Lior Amsalem <alior@...vell.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH] pinctrl: mvebu: armada-38x: add suspend/resume support

Hello Marcin,

On Sun, 18 Oct 2015 10:43:42 +0200, Marcin Wojtas wrote:

> Thanks for pointing this. I based on pinctrl-armada-xp.c (it needs a
> fix then, too) and it worked. I must have missed, because I got proper
> registers' number and values in suspend/resume routines. As
> pinctrl-armada-xp.c needs also a small fix and in order not to
> duplicate code, how about a following solution:
> - *mpp_saved_regs and *mpp_base become members of struct mvebu_pinctrl_soc_info

I don't like this. The mvebu_pinctrl_soc_info structure is meant to be
a read-only structure that only describes static information giving
SoC-specific details for pin-muxing. The idea is that in the event
where you had multiple pinctrl in the same system, you would still have
only one instance of mvebu_pinctrl_soc_info.

So, I'd prefer if mpp_saved_regs and mpp_base became members of a new
structure, that gets allocated at ->probe() time, on a per-instance
basis.

> - common mvebu_pinctrl_suspend/resume functions in pinctrl-mvebu.c
> (now there will be two users AXP and A38X)

Not sure how to handle that if the per-instance structure is defined on
a per-SoC basis, but I'm interested in seeing proposals.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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