linux-kernel - Re: [PATCH v2 2/3] spi: meson-axg: enhance output enable feature

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Date:   Thu, 13 Dec 2018 11:53:45 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Sunny Luo <sunny.luo@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Xingyu Chen <xingyu.chen@...ogic.com>,
        linux-spi@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] spi: meson-axg: enhance output enable feature

On Thu, Dec 13, 2018 at 10:04:56AM +0100, Jerome Brunet wrote:
> On Thu, 2018-12-13 at 16:39 +0800, Sunny Luo wrote:

> >  
> >  	writel_bits_relaxed(BIT(24), BIT(24), spicc->base + SPICC_TESTREG);
> >  
> > +	meson_spicc_oen_enable(spicc);
> > +

> Any specific reason for doing this in prepare_message() ? It looks like
> something that could/should be done during the probe ?

If it's for power management then there should be a matching disable in
unprepare_message() (or this should just be in the runtime PM code,
though it's possible there's stuff that's only needed while actually
doing transfers in which case this could make sense).

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