linux-kernel - Re: [PATCH v9 08/24] wfx: add bus

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Message-ID: <20220112174848.db5osolurllpc7du@pali>
Date:   Wed, 12 Jan 2022 18:48:48 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Jérôme Pouiller <jerome.pouiller@...abs.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v9 08/24] wfx: add bus_sdio.c

On Wednesday 12 January 2022 17:45:45 Jérôme Pouiller wrote:
> On Wednesday 12 January 2022 12:43:32 CET Pali Rohár wrote:
> > 
> > On Wednesday 12 January 2022 12:18:58 Jérôme Pouiller wrote:
> > > On Wednesday 12 January 2022 11:58:59 CET Pali Rohár wrote:
> > > > On Tuesday 11 January 2022 18:14:08 Jerome Pouiller wrote:
> > > > > +static const struct sdio_device_id wfx_sdio_ids[] = {
> > > > > +     { SDIO_DEVICE(SDIO_VENDOR_ID_SILABS, SDIO_DEVICE_ID_SILABS_WF200) },
> > > > > +     { },
> > > > > +};
> > > >
> > > > Hello! Is this table still required?
> > >
> > > As far as I understand, if the driver does not provide an id_table, the
> > > probe function won't be never called (see sdio_match_device()).
> > >
> > > Since, we rely on the device tree, we could replace SDIO_VENDOR_ID_SILABS
> > > and SDIO_DEVICE_ID_SILABS_WF200 by SDIO_ANY_ID. However, it does not hurt
> > > to add an extra filter here.
> > 
> > Now when this particular id is not required, I'm thinking if it is still
> > required and it is a good idea to define these SDIO_VENDOR_ID_SILABS
> > macros into kernel include files. As it would mean that other broken
> > SDIO devices could define these bogus numbers too... And having them in
> > common kernel includes files can cause issues... e.g. other developers
> > could think that it is correct to use them as they are defined in common
> > header files. But as these numbers are not reliable (other broken cards
> > may have same ids as wf200) and their usage may cause issues in future.
> 
> In order to make SDIO_VENDOR_ID_SILABS less official, do you prefer to
> define it in wfx/bus_sdio.c instead of mmc/sdio_ids.h?
> 
> Or even not defined at all like:
> 
>     static const struct sdio_device_id wfx_sdio_ids[] = {
>          /* WF200 does not have official VID/PID */
>          { SDIO_DEVICE(0x0000, 0x1000) },
>          { },
>     };

This has advantage that it is explicitly visible that this device does
not use any officially assigned ids.

> 
> 
> -- 
> Jérôme Pouiller
> 
>