Date:   Mon, 6 Mar 2023 23:40:12 +0300
From:   Serge Semin <fancer.lancer@gmail.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Brad Larson <blarson@amd.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-mmc@vger.kernel.org, linux-spi@vger.kernel.org,
        adrian.hunter@intel.com, alcooperx@gmail.com, arnd@arndb.de,
        brendan.higgins@linux.dev, briannorris@chromium.org,
        brijeshkumar.singh@amd.com, catalin.marinas@arm.com,
        davidgow@google.com, gsomlo@gmail.com, gerg@linux-m68k.org,
        krzk@kernel.org, krzysztof.kozlowski+dt@linaro.org, lee@kernel.org,
        lee.jones@linaro.org, broonie@kernel.org,
        yamada.masahiro@socionext.com, p.zabel@pengutronix.de,
        piotrs@cadence.com, p.yadav@ti.com, rdunlap@infradead.org,
        robh+dt@kernel.org, samuel@sholland.org, skhan@linuxfoundation.org,
        suravee.suthikulpanit@amd.com, thomas.lendacky@amd.com,
        tonyhuang.sunplus@gmail.com, ulf.hansson@linaro.org,
        vaishnav.a@ti.com, will@kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v10 10/15] spi: dw: Add support for AMD Pensando Elba SoC
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On Mon, Mar 06, 2023 at 09:59:29PM +0200, Andy Shevchenko wrote:
> On Mon, Mar 6, 2023 at 6:00 PM Serge Semin <fancer.lancer@gmail.com> wrote:
> > On Sun, Mar 05, 2023 at 08:07:34PM -0800, Brad Larson wrote:
> 
> ...
> 
> > > -     node = of_parse_phandle(np, syscon_name, 0);
> >
> >         node = of_parse_phandle(dev_of_node(pdev->dev), syscon_name, 0);
> 

> Side note: I would rather see syscon_fwnode_to_regmap() instead of
> this. And IIRC syscon already has an API to find by name.

Ah, right. Though it's called syscon_regmap_lookup_by_phandle() and it
can be used to replace the entire pattern: "Parse property; Find node
by phandle; Get regmap by node". Basically the of_parse_phandle() and
syscon_node_to_regmap() methods invocation can be replaced with just a
single function call. Thus there won't be need to worry about
decrementing the found DT-node ref-counter.

> 
> > > +     if (!node)
> >
> > > +             return dev_err_probe(&pdev->dev, -ENODEV, "failed to find %s\n",
> > > +                                  syscon_name);
> >
> > Hm, using dev_err_probe() with known error value seems overkill.
> 

> It's allowed use and it helps to drop a few unnecessary lines of code.

Ok, seeing there is no alternative to that method which would return
the passed error but wouldn't have a name implying the silent
deferred-probe error semantics.

-Serge(y)

> 
> > > +     syscon = syscon_node_to_regmap(node);
> > > +     if (IS_ERR(syscon))
> > > +             return dev_err_probe(&pdev->dev, PTR_ERR(syscon),
> > > +                                  "syscon regmap lookup failed\n");
> 
> -- 
> With Best Regards,
> Andy Shevchenko