linux-kernel - Re: [PATCH] i2c: i801: Register optional lis3lv02d i2c device on Dell machines

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Message-ID: <CAHp75VeWBaPNmT0mb+Gs_ZhFEHFx_H-Ro0UQ9u1VvLhNVjCqYQ@mail.gmail.com>
Date:   Wed, 28 Dec 2016 00:15:30 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>, Jean Delvare <jdelvare@...e.com>,
        Steven Honeyman <stevenhoneyman@...il.com>,
        valdis.kletnieks@...edu,
        Jochen Eisinger <jochen@...guin-breeder.org>,
        Gabriele Mazzotta <gabriele.mzt@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <mario_limonciello@...l.com>,
        Alex Hung <alex.hung@...onical.com>,
        MichaÅ‚ KÄ™pieÅ„ 
        <kernel@...pniu.pl>, Takashi Iwai <tiwai@...e.de>,
        linux-i2c@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] i2c: i801: Register optional lis3lv02d i2c device on Dell machines

On Tue, Dec 27, 2016 at 3:51 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> On Tuesday 27 December 2016 14:43:49 Wolfram Sang wrote:
>> > Dell platform team told us that some (DMI whitelisted) Dell
>> > Latitude machines have ST microelectronics accelerometer at i2c
>> > address 0x29. That
>> > i2c address is not specified in DMI or ACPI, so runtime detection
>> > without
>> > whitelist which is below is not possible.
>>
>> I'd think this should rather live somewhere in
>> drivers/platform/x86/dell*.c?
>
> i2c_new_device() with lis3lv02d for i801 i2c bus needs to be called
> after initializing i2c-i801 bus driver.
>
> I have no idea how to do it (properly) outside of i2c-i801.c file.

I doubt we need a single line of code for this. See [1] and perhaps
create an EFI variable with necessary upgrade device node.

> Same thing is done for Fujitsu machines, see function
> i801_probe_optional_slaves() in i2c-i801.c file. So I did similar
> approach for Dell machines.

Perhaps, this also needs to be converted to use EFI variable.

[1] https://lwn.net/Articles/693212/

-- 
With Best Regards,
Andy Shevchenko