linux-kernel - Re: [PATCH v6 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver

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Message-ID: <alpine.DEB.2.21.2007311104400.1767@sstabellini-ThinkPad-T480s>
Date:   Fri, 31 Jul 2020 16:03:37 -0700 (PDT)
From:   Stefano Stabellini <stefano.stabellini@...inx.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
cc:     Ben Levinsky <ben.levinsky@...inx.com>, ohad@...ery.com,
        bjorn.andersson@...aro.org, michals@...inx.com, JOLLYS@...inx.com,
        RAJANV@...inx.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernell@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, jliang@...inx.com,
        stefanos@...inx.com, Wendy Liang <wendy.liang@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        Ed Mooring <ed.mooring@...inx.com>, Jason Wu <j.wu@...inx.com>
Subject: Re: [PATCH v6 5/5] remoteproc: Add initial zynqmp R5 remoteproc
 driver

On Tue, 28 Jul 2020, Mathieu Poirier wrote:
> On Wed, Jul 15, 2020 at 08:33:17AM -0700, Ben Levinsky wrote:
> > R5 is included in Xilinx Zynq UltraScale MPSoC so by adding this
> > remotproc driver, we can boot the R5 sub-system in different
> > configurations.
> > 
> > Acked-by: Stefano Stabellini <stefano.stabellini@...inx.com>
> > Acked-by: Ben Levinsky <ben.levinsky@...inx.com>
> > Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> > Signed-off-by: Ben Levinsky <ben.levinsky@...inx.com>
> > Signed-off-by: Wendy Liang <wendy.liang@...inx.com>
> > Signed-off-by: Michal Simek <michal.simek@...inx.com>
> > Signed-off-by: Ed Mooring <ed.mooring@...inx.com>
> > Signed-off-by: Jason Wu <j.wu@...inx.com>
> > Tested-by: Ben Levinsky <ben.levinsky@...inx.com>

[...]

> > +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
> > +{
> > +	int ret, i = 0;
> > +	u32 *lockstep_mode;
> > +	struct device *dev = &pdev->dev;
> > +	struct device_node *nc;
> > +	struct zynqmp_r5_pdata *pdata;
> > +
> > +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > +	lockstep_mode = devm_kzalloc(dev, sizeof(u32 *), GFP_KERNEL);
> > +	if (!pdata || !lockstep_mode)
> > +		return -ENOMEM;
> > +
> > +	platform_set_drvdata(pdev, pdata);
> 
> As far as I can tell the above, along with allocating memory for @pdata, is not
> needed since zynqmp_r5_remoteproc_remove() uses rpus[].
> 
> I have only reviewed the _probe() function and already encountered a fair amount
> of fundemantal errors.  As such I will stop my review here. I will need to see a
> reviewed-by tag (on the mailing list) by Stephano or Michal before reviewing the
> next set. 

Let me take this opportunity to say that my Acked-by on this version of
the series was an unintentional miscommunication: I didn't give my
Acked-by as I haven't even read the patches yet.

I'll circle back with Michal and we'll make sure for either of us to do
a round of public reviews on the next version.