linux-kernel - Re: [PATCH v4 5/6] ARM: zynq: Add OCM controller driver

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Date:	Fri, 28 Nov 2014 16:35:03 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Michal Simek <monstr@...str.eu>,
	Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joe Perches <joe@...ches.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Antti Palosaari <crope@....fi>,
	Jingoo Han <jg1.han@...sung.com>,
	Sandeep Nair <sandeep_n@...com>,
	Santosh Shilimkar <santosh.shilimkar@...il.com>,
	Andy Gross <agross@...eaurora.org>,
	Thierry Reding <treding@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] ARM: zynq: Add OCM controller driver

On Thu, Nov 27, 2014 at 2:57 PM, Michal Simek <michal.simek@...inx.com> wrote:
> On 11/27/2014 02:20 PM, Linus Walleij wrote:
>> On Fri, Nov 14, 2014 at 11:52 AM, Michal Simek <michal.simek@...inx.com> wrote:

>> (...)
>>> +       zynq_ocmc->pool = devm_gen_pool_create(&pdev->dev,
>>> +                                              ilog2(ZYNQ_OCMC_GRANULARITY),
>>> +                                              -1);
>>
>> Do this:
>>
>> #include <linux/sizes.h>
>>
>> zynq_ocmc->pool = devm_gen_pool_create(&pdev->dev,
>>                                        ilog2(SZ_64K),
>>                                        -1);
>>
>> And get rid of the #define for ZYNQ_OCMC_GRANULARITY
>
> ilog2 from 32 is different to ilog2 from ilog2 from 0x10000.

Bah I misread the code, forget this comment.

Maybe it's more like I wanted

+#define ZYNQ_OCMC_BLOCK_SIZE   0x10000

To be replaced with SZ_64K

But it's a petty detail anyway.

> Do you have any opinion regarding calling zynq_slcr_get_ocm_config()?
>
> Is it better to expose slcr this interface to drivers?
> Or use regmap and read this value directly?

Depends on what provides that call. The pattern I usually follow
is to expose the mixed-registers range as a syscon device
using drivers/mfd/syscon.c and then use one of the methods from
<linux/mfd/syscon.h> to look up a reference to the regmap and
use it to access misc registers.

> Also I do read for CONFIG_SMP case jump trampoline size - maybe
> you can have better idea how this can be done.

No I have no clue about that... :(

Yours,
Linus Walleij
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