linux-kernel - Re: [PATCH v1 1/2] eeprom: at24: convert magic numbers to structs.

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Date:   Fri, 8 Dec 2017 16:05:54 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Sven Van Asbroeck <svendev@...x.com>,
        Wolfram Sang <wsa@...-dreams.de>, nsekhar@...com,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Javier Martinez Canillas <javier@...hile0.org>,
        Divagar Mohandass <divagar.mohandass@...el.com>,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] eeprom: at24: convert magic numbers to structs.

2017-12-08 15:17 GMT+01:00 Sven Van Asbroeck <thesven73@...il.com>:
> Bartosz wrote:
>>> +#define AT24_OF_DEVICE_ID(_mfg, _name) \
>>> +       { .compatible = #_mfg "," #_name, .data = &platdata_##_name }
>>
>> I don't like hiding the way the compatible is created here from the
>> user. It doesn't save any code neither. Please make the macro accept
>> the whole compatible string.
>>
>
> If the macro accepts the whole compatible string "mfg,chip-name" (e.g.
> "atmel,24c01")
> then how can I extract chip-name from that string? I need to attach
> chip-name to the
> platdata_ static structures. (e.g. "atmel,24c01" -> .data = platdata_24c01)

Just make it accept two parameters: the string and the data object
name. For example:

AT24_OF_DEVICE_ID("atmel,24c01", 24c01);

Thanks,
Bartosz