linux-kernel - Re: [PATCH v4 2/4] crypto: mxs-dcp

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Message-ID: <a97517bf72f649915bccf555ab7d3c8c4551298d.camel@nxp.com>
Date:   Wed, 17 Oct 2018 12:59:39 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     "festevam@...il.com" <festevam@...il.com>
CC:     dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Franck Lenormand <franck.lenormand@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Horia Geanta <horia.geanta@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v4 2/4] crypto: mxs-dcp - Add support for dcp clk

On Wed, 2018-10-17 at 09:48 -0300, Fabio Estevam wrote:
> On Wed, Oct 17, 2018 at 9:38 AM Leonard Crestez <leonard.crestez@....com> wrote:
> > 
> > On 6ull and 6sll the DCP block has a clock which needs to be explicitly
> > enabled.
> > 
> > Add minimal handling for this at probe/remove time.
> > 
> > Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> 
> Please always explain what changed from the previous patch version.

There is a changelog in the cover letter.

> > +       /* Restart the DCP block. */
> > +       ret = stmp_reset_block(sdcp->base);
> > +       if (ret) {
> > +               dev_err(dev, "Failed reset\n");
> > +               goto err_disable_unprepare_clk;
> > +       }
> 
> This seems like an unrelated change that should be in a separate patch.
> 
> Also, this was not present in v3, so it is better to explain that this
> has been introduced in v4.

This only looks slightly odd in git diff but it's not unrelated.

I placed clk get/prepare/enable just before stmp_reset_block and made
stmp_reset_block print a message and goto err_disable_unprepare_clk on
failure instead of just "if (ret) return ret;"