linux-kernel - Re: [PATCHv5 2/4] mailbox: Introduce framework for mailbox

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Message-ID: <CAJe_ZhfdcN8RBLgg02kN1hZ_j_JVSLM=2kEuYK+3DxqSiyCwgw@mail.gmail.com>
Date:	Mon, 19 May 2014 23:33:00 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jassi Brar <jassisinghbrar@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Anna, Suman" <s-anna@...com>,
	Loic Pallardy <loic.pallardy@...com>,
	LeyFoon Tan <lftan.linux@...il.com>,
	Craig McGeachie <slapdau@...oo.com.au>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Rob Herring <robherring2@...il.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	"ks.giri@...sung.com" <ks.giri@...sung.com>
Subject: Re: [PATCHv5 2/4] mailbox: Introduce framework for mailbox

On 19 May 2014 18:38, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 16 May 2014 19:03:25 Jassi Brar wrote:

>
>>  Also, some platform might need to communicate with remote master
>> during very early boot like for initializing system timers and clocks.
>> The API isn't working then.
>
> Do you have an example for a platform like that? I'd expect that normally
> we can have a boot loader that sets up the system timer to work good
> enough for us to get into normal driver initialization.
>
My platform. We choose to keep bootloader to the minimum and make
kernel not depend upon any goodies provided.
Second, which I don't think can be helped by a bootloader, the remote
master has gate & rate control of clocks to peripheral IPs. The
clk-api driver simply maps Linux requests onto mailbox commands. So
the mailbox is needed as early as CLK_OF_DECLARE (when kernel reads
the rate of every registered clock).   Any suggestions?

Thanks
Jassi
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