linux-kernel - Re: [PATCH v7 4/7] usb: phy: tegra: Support OTG mode programming

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Date:   Mon, 4 Oct 2021 23:22:48 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, Peter Chen <peter.chen@...nel.org>,
        David Heidelberg <david@...t.cz>
Subject: Re: [PATCH v7 4/7] usb: phy: tegra: Support OTG mode programming

On Tue, Oct 05, 2021 at 12:13:48AM +0300, Dmitry Osipenko wrote:
> 05.10.2021 00:05, Thierry Reding пишет:
> > On Mon, Sep 27, 2021 at 07:36:52PM +0300, Dmitry Osipenko wrote:
> >> 12.09.2021 21:17, Dmitry Osipenko пишет:
> >>> Support programming USB PHY into OTG mode.
> >>>
> >>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> >>> ---
> >>>  drivers/usb/phy/phy-tegra-usb.c   | 198 +++++++++++++++++++++++++++++-
> >>>  include/linux/usb/tegra_usb_phy.h |   5 +
> >>>  2 files changed, 198 insertions(+), 5 deletions(-)
> >>
> >> Greg / Felipe, could you please ack this patch to allow Thierry to take
> >> this series via the Tegra tree? It depends on the soc/tegra patch of
> >> this patchset.
> > 
> > Looking at the series, I don't think this necessarily needs to go
> > through the Tegra tree. Given that you have backwards-compatibility with
> > older device trees, applying this separately to the USB tree should work
> > fine. Once the soc/tegra and DT bits and the USB bits get combined they
> > should enable the new functionality, but nothing should break if things
> > are applied separately.
> > 
> > If so, I can just pick up the rest and let Felipe or Greg pick this one
> > up.
> > 
> > Dmitry, can you confirm that this patch should be applicable separately?
> > If so:
> > 
> > Acked-by: Thierry Reding <treding@...dia.com>
> > 
> 
> This PHY patch has this hunk:
> 
> +	phy->pmc_regmap = dev_get_regmap(&pmc_pdev->dev, "usb_sleepwalk");
> +	if (!phy->pmc_regmap)
> +		return -EINVAL;
> 
> If this patch and the DT patches will be applied before the soc/tegra
> patch, then USB PHY driver will fail to probe.

I had missed that. I was assuming that this other hunk took care of the
backwards-compatibility:

+       /* older device-trees don't have PMC regmap */
+       if (!phy->pmc_regmap)
+               return 0;

but that's rather pointless given your check above, right? Why not just
return 0 instead and let the remaining code skip sleepwalk configuration
if the regmap doesn't exist?

Thierry

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