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

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Message-Id: <201612280938.41260@pali>
Date:   Wed, 28 Dec 2016 09:38:40 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...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 Tuesday 27 December 2016 23:15:30 Andy Shevchenko wrote:
> 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.

Sorry, but EFI variable is not accessible from BIOS booted kernel. So 
such thing will not work.

-- 
Pali Rohár
pali.rohar@...il.com

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