From: Josh Cartwright <joshc@codeaurora.org>
To: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Bjorn Andersson <bjorn@kryo.se>,
Mark Rutland <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Suman Anna <s-anna@ti.com>, Tony Lindgren <tony@atomide.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Grant Likely <grant.likely@secretlab.ca>,
Kumar Gala <galak@codeaurora.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCHv4 4/7] hwspinlock/core: add common OF helpers
Date: Fri, 14 Mar 2014 10:23:04 -0500 [thread overview]
Message-ID: <20140314152304.GS18529@joshc.qualcomm.com> (raw)
In-Reply-To: <CAK=WgbYS+eJSTBXF=OeWjuL6iSbH+Y1RYewARKh9yAXHKKZ_cA@mail.gmail.com>
On Fri, Mar 14, 2014 at 03:12:26PM +0200, Ohad Ben-Cohen wrote:
> On Sun, Mar 2, 2014 at 10:19 PM, Bjorn Andersson <bjorn@kryo.se> wrote:
> > When introducing the ability to reference a hwspin lock via a phandle
> > in device tree it makes a big difference to be able to differ between
> > the case of "initialization failed" or "device not yet probed"; so
> > that the client knows if it should fail or retry later.
>
> I'm not convinced.
>
> The only advantage this brings is to avoid retrying in case a fatal
> error has occurred. Such fatal errors are extremely rare, and when
> they show up - extremely painful, and I suspect that optimizing them
> wouldn't be a big win.
So, are you suggesting that because fatal errors should be "extremely
rare", a consuming driver should just assume that if NULL is returned
from a hwspin_lock_request*() function that it was the "device not yet
probed" case that was hit?
Note that having the consumer/hwspinlock device relationship modeled in
devicetree introduces more potential failure cases...
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-03-14 15:23 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-14 0:19 [PATCHv4 0/7] omap hwspinlock dt support Suman Anna
2014-01-14 0:19 ` [PATCHv4 1/7] Documentation: dt: add common bindings for hwspinlock Suman Anna
2014-01-14 0:19 ` [PATCHv4 2/7] Documentation: dt: add the omap hwspinlock bindings document Suman Anna
2014-01-14 0:19 ` [PATCHv4 3/7] hwspinlock/core: maintain a list of registered hwspinlock banks Suman Anna
2014-01-14 0:19 ` [PATCHv4 4/7] hwspinlock/core: add common OF helpers Suman Anna
2014-02-07 22:49 ` Bjorn Andersson
2014-02-10 19:14 ` Suman Anna
2014-03-02 5:14 ` Ohad Ben-Cohen
2014-03-02 20:19 ` Bjorn Andersson
2014-03-03 18:46 ` Suman Anna
[not found] ` <CAJAp7Ohf43hbKatCwS5Y1+OfEkJYWOkuhZhW-E_=t_9mfM+UaA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-03-04 17:38 ` Suman Anna
[not found] ` <53160F8F.9060405-l0cyMroinI0@public.gmane.org>
2014-03-13 16:43 ` Josh Cartwright
2014-03-14 8:58 ` Ohad Ben-Cohen
2014-03-14 13:12 ` Ohad Ben-Cohen
2014-03-14 15:23 ` Josh Cartwright [this message]
2014-03-15 17:32 ` Ohad Ben-Cohen
2014-09-26 14:40 ` Bjorn Andersson
2014-09-26 16:25 ` Suman Anna
[not found] ` <5425938C.6070007-l0cyMroinI0@public.gmane.org>
2014-10-06 9:44 ` Ohad Ben-Cohen
[not found] ` <CAK=WgbYf3++K4MVXW_n4zj-8fMEee61XG5+r40cW=trapRtJ7w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-11-06 18:24 ` Suman Anna
[not found] ` <545BBCCB.7030107-l0cyMroinI0@public.gmane.org>
2014-11-07 5:06 ` Ohad Ben-Cohen
2014-01-14 0:19 ` [PATCHv4 6/7] hwspinlock/omap: enable module before reading SYSSTATUS register Suman Anna
2014-01-14 13:10 ` Felipe Balbi
2014-01-14 14:04 ` Felipe Balbi
[not found] ` <20140114140440.GA15785-HgARHv6XitL9zxVx7UNMDg@public.gmane.org>
2014-01-14 16:56 ` Anna, Suman
2014-01-15 23:46 ` Anna, Suman
2014-01-15 23:36 ` [UPDATED PATCHv4 " Suman Anna
2014-01-14 0:19 ` [PATCHv4 7/7] hwspinlock/omap: enable build for AM33xx, AM43xx & DRA7xx Suman Anna
2014-01-14 13:12 ` Felipe Balbi
2014-01-14 16:51 ` Anna, Suman
2014-01-14 17:29 ` Felipe Balbi
2014-01-14 18:36 ` Anna, Suman
2014-01-14 13:12 ` [PATCHv4 0/7] omap hwspinlock dt support Felipe Balbi
[not found] ` <1389658764-39199-1-git-send-email-s-anna-l0cyMroinI0@public.gmane.org>
2014-01-14 0:19 ` [PATCHv4 5/7] hwspinlock/omap: add support for dt nodes Suman Anna
2014-02-10 19:27 ` [PATCHv4 0/7] omap hwspinlock dt support Suman Anna
2014-02-24 18:14 ` Suman Anna
[not found] ` <530B8C00.8020001-l0cyMroinI0@public.gmane.org>
2014-03-14 20:10 ` Ohad Ben-Cohen
[not found] ` <CAK=WgbZp_RQPCeZJyMRkNTQxaJsnGZ3DnjhSkYYR_-PAE_Kp4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-03-14 23:58 ` Suman Anna
2014-03-17 14:23 ` Ohad Ben-Cohen
[not found] ` <CAK=WgbZCzA7JovSxnysHCQRZZWc3Z2j3AS8ekpM9fOZ160rmCA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-03-17 19:10 ` Suman Anna
[not found] ` <532748B7.1080606-l0cyMroinI0@public.gmane.org>
2014-03-17 19:47 ` Ohad Ben-Cohen
2014-03-17 23:46 ` Suman Anna
[not found] ` <53278950.5030905-l0cyMroinI0@public.gmane.org>
2014-03-18 13:35 ` Ohad Ben-Cohen
2014-03-31 22:45 ` Suman Anna
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