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Message-ID: <20230329145636.GV2673958@google.com>
Date: Wed, 29 Mar 2023 15:56:36 +0100
From: Lee Jones <lee@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: "Sahin, Okan" <Okan.Sahin@...log.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Cosmin Tanislav <demonsingur@...il.com>,
Stephen Boyd <sboyd@...nel.org>,
Caleb Connolly <caleb.connolly@...aro.org>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
"Bolboaca, Ramona" <Ramona.Bolboaca@...log.com>,
ChiYuan Huang <cy_huang@...htek.com>,
"Tilki, Ibrahim" <Ibrahim.Tilki@...log.com>,
William Breathitt Gray <william.gray@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
ChiaEn Wu <chiaen_wu@...htek.com>,
Haibo Chen <haibo.chen@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v6 5/5] mfd: max77541: Add ADI MAX77541/MAX77540 PMIC
Support
On Wed, 29 Mar 2023, Andy Shevchenko wrote:
> On Wed, Mar 29, 2023 at 03:36:15PM +0100, Lee Jones wrote:
> > On Tue, 28 Mar 2023, Sahin, Okan wrote:
> > > >On Wed, 15 Mar 2023, Lee Jones wrote:
> > > >> On Tue, 07 Mar 2023, Okan Sahin wrote:
>
> ...
>
> > > +static const struct i2c_device_id max77541_i2c_id[] = {
> > > + { "max77540", (kernel_ulong_t)&chip[MAX77540] },
> > > + { "max77541", (kernel_ulong_t)&chip[MAX77541] },
> >
> > Just 'MAX77540' is fine.
>
> I tend to disagree.
>
> There is an error prone approach esp. when we talk with some functions
> that unifies OF/ACPI driver data retrieval with legacy ID tables.
> In such a case the 0 from enum is hard to distinguish from NULL when
> the driver data is not set or not found. On top of that the simple integer
> in the legacy driver data will require additional code to be added in
> the ->probe().
Use a !0 enum?
The extra handling is expected and normal.
--
Lee Jones [李琼斯]
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