From: Bjorn Andersson <bjorn@kryo.se>
To: Suman Anna <s-anna@ti.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>,
Mark Rutland <mark.rutland@arm.com>,
Rob Herring <robherring2@gmail.com>,
Kumar Gala <galak@codeaurora.org>,
Josh Cartwright <joshc@codeaurora.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock
Date: Thu, 5 Feb 2015 15:01:06 -0800 [thread overview]
Message-ID: <CAJAp7OiHfaMrVqaZ1r6ZN0aMMpE4OUnvLhODHQJeb6EJMa+o8A@mail.gmail.com> (raw)
In-Reply-To: <54CFE71E.20905@ti.com>
On Mon, Feb 2, 2015 at 1:07 PM, Suman Anna <s-anna@ti.com> wrote:
> On 02/01/2015 11:55 AM, Bjorn Andersson wrote:
>> On Fri, Jan 30, 2015 at 9:41 PM, Ohad Ben-Cohen <ohad@wizery.com> wrote:
>>> On Sat, Jan 31, 2015 at 1:29 AM, Bjorn Andersson <bjorn@kryo.se> wrote:
>>>> In a system where you have two hwlock blocks lckA and lckB, each
>>>> consisting of 8 locks and you have dspB that can only access lckB
>>>
>>> This is a good example - thanks. To be able to cope with such cases we
>>> will have to pass a hwlock block reference and its relative lock id.
>>>
>>
>> Correct, so the #hwlock-cells and hwlock part from the proposal are
>> the important one. Having an optional hwlock-names will make things
>> easier to read as well, but is not necessary.
>
> Right, if anything, it would be useful only for the clients, but the
> hwspinlock core itself would not need it. So, I would forgo adding the
> hwlock-names for now.
>
>>
>>> The DT binding should definitely be prepared for such cases (just kill
>>> the base-id field?), but let's see what it means about the Linux
>>> implementation.
>>>
>>
>> From the dt binding PoV, we should be able to skip num-locks as well.
>> It seems most hwlock blocks have a fixed amount of locks provided and
>> the drivers are reporting this to the core when registering.
>
> I added this originally based on the initial MSM HW Mutex block bindings.
>
It's not entirely correct to have this in DT for the MSM HW, as the
hardware has a fixed number of mutexes. As soon as we have the binding
sorted out I will follow up with a new revision of the tcsr/sfpb-mutex
driver.
>>
>> So I think we can reduce the binding to:
>>
>> Providers:
>> #hwlock-cells
>>
>> Consumers:
>> hwlocks
>> hwlock-names
>>
>> For the hardware where number of locks is actually variable (e.g.
>> different variants of same block) there can be driver specific entries
>> for this.
>
> Right, we should be able to drop this and use the driver match data. As
> it is, the field is used during registration of the block with the
> hwspinlock core.
>
If we have certain systems where it actually is a property to be
configured then they can have individual properties, extending the
standard set. Either way, it's not a dynamic property shared by all
hwlock drivers, so it should not be in the common binding.
Will you send out a new revision of the binding? I would love to get
this integrated so I can move on with the dependents.
Regards,
Bjorn
next prev parent reply other threads:[~2015-02-05 23:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-14 20:58 [PATCH v7 0/4] hwspinlock core & omap dt support Suman Anna
2015-01-14 20:58 ` [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock Suman Anna
2015-01-15 13:52 ` Mark Rutland
2015-01-15 13:55 ` Mark Rutland
2015-01-15 14:42 ` Rob Herring
2015-01-15 20:16 ` Suman Anna
2015-01-16 6:09 ` Ohad Ben-Cohen
2015-01-16 10:17 ` Mark Rutland
2015-01-17 0:46 ` Ohad Ben-Cohen
2015-01-20 18:05 ` Tony Lindgren
2015-01-21 12:41 ` Ohad Ben-Cohen
2015-01-21 17:56 ` Suman Anna
2015-01-22 18:56 ` Mark Rutland
2015-01-29 3:58 ` Suman Anna
2015-02-11 11:29 ` Mark Rutland
2015-02-16 18:06 ` Bjorn Andersson
2015-01-30 23:29 ` Bjorn Andersson
2015-01-31 5:41 ` Ohad Ben-Cohen
2015-02-01 11:00 ` Ohad Ben-Cohen
2015-02-02 21:14 ` Suman Anna
2015-02-01 17:55 ` Bjorn Andersson
2015-02-02 21:07 ` Suman Anna
2015-02-05 23:01 ` Bjorn Andersson [this message]
2015-02-06 0:11 ` Suman Anna
2015-02-06 0:34 ` Bjorn Andersson
2015-02-11 10:29 ` Ohad Ben-Cohen
2015-02-11 11:35 ` Mark Rutland
2015-02-16 20:30 ` Bjorn Andersson
2015-01-16 10:19 ` Mark Rutland
2015-01-16 17:49 ` Suman Anna
2015-01-14 20:58 ` [PATCH v7 2/4] Documentation: dt: add the omap hwspinlock bindings document Suman Anna
2015-01-14 20:58 ` [PATCH v7 3/4] hwspinlock/core: add common OF helpers Suman Anna
2015-01-14 20:58 ` [PATCH v7 4/4] hwspinlock/omap: add support for dt nodes Suman Anna
2015-01-15 10:13 ` [PATCH v7 0/4] hwspinlock core & omap dt support Ohad Ben-Cohen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAJAp7OiHfaMrVqaZ1r6ZN0aMMpE4OUnvLhODHQJeb6EJMa+o8A@mail.gmail.com \
--to=bjorn@kryo.se \
--cc=devicetree@vger.kernel.org \
--cc=galak@codeaurora.org \
--cc=joshc@codeaurora.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-omap@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=ohad@wizery.com \
--cc=robh+dt@kernel.org \
--cc=robherring2@gmail.com \
--cc=s-anna@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).