linux-kernel - Re: [PATCH V3 1/2] spmi: remove wakeup command before slave probe

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Message-ID: <20150218153918.GB3485@kryptos>
Date:	Wed, 18 Feb 2015 09:39:18 -0600
From:	Josh Cartwright <joshc@....teric.us>
To:	Gilad Avidov <gavidov@...eaurora.org>
Cc:	sdharia@...eaurora.org, mlocke@...eaurora.org,
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, iivanov@...sol.com,
	galak@...eaurora.org, agross@...eaurora.org
Subject: Re: [PATCH V3 1/2] spmi: remove wakeup command before slave probe

On Mon, Feb 09, 2015 at 03:51:11PM -0700, Gilad Avidov wrote:
> According to spmi spec a slave powers up into startup state and then
> transitions into active state. Thus, the wakeup command is not required
> before calling the slave's probe. The wakeup command is only needed for
> slaves that are in sleep state after receiving the sleep command.
>
> This is a bug since spmi master controllers, such as spmi-pmic-arb,
> which have no support for wakeup command return an error on that
> command and thus fail before reaching a slave driver probe.

If masters are required by the spec to support all commands as Stephen
mentions, then I'd argue this is not a bug in the core code at all, but
in the spmi-pmic-arb driver.  But, unfortunately, having lost access to
the spec, I'll defer.

Regardless, I think this is useful as an optimization, just with dubious
justification.

Therefore,

Acked-by: Josh Cartwright <joshc@....teric.us>

  Josh
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