linux-kernel - Re: [RESEND PATCH v5 00/16] eeprom: at24: Add OF device ID table

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Date:   Wed, 30 Aug 2017 18:19:02 +0200
From:   Javier Martinez Canillas <javier@...hile0.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>, Florian Larysch <fl@...1.de>,
        David Lechner <david@...hnology.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        Simon Horman <horms@...ge.net.au>,
        Michal Simek <michal.simek@...inx.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Scott Wood <oss@...error.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joachim Eastwood <manabian@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Magnus Damm <magnus.damm@...il.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Uwe Kleine-König <kernel@...gutronix.de>,
        Linux I2C <linux-i2c@...r.kernel.org>
Subject: Re: [RESEND PATCH v5 00/16] eeprom: at24: Add OF device ID table

Hello Wolfram,

On Tue, Aug 29, 2017 at 10:48 AM, Wolfram Sang <wsa@...-dreams.de> wrote:
>
>> I don't have a DT based system at hand now, but I'll test it again and
>> let you know probably tomorrow.
>
> I will try again today, too. Thanks!
>

Ok, I had some time to do some tests again. I used an ARM Chromebook
(Exynos Peach Pi) that has an I2C touchpad (Atmel maXTouch).

Tested the following cases:

1) Driver without OF device ID table (only a I2C table with a
"maxtouch" entry) and DTS defining a device node with a
"atmel,maxtouch" compatible string. This is the case without any of
the patches in this series.

$ modinfo drivers/input/touchscreen/atmel_mxt_ts.ko | grep maxtouch
alias:          i2c:maxtouch

$ grep maxtouch /sys/devices/platform/soc/12e00000.i2c/i2c-8/8-004b/uevent
OF_COMPATIBLE_0=atmel,maxtouch
MODALIAS=i2c:maxtouch

2) Driver without OF device ID table (only a I2C table with a
"maxtouch" entry) and DTS defining a device node with a
"atmel,maxtouch", "generic,maxtouch" compatible string. This is the
case when platform maintainers merge the DTS patches without the
driver patch.

$ modinfo drivers/input/touchscreen/atmel_mxt_ts.ko | grep maxtouch
alias:          i2c:maxtouch

$ grep maxtouch /sys/devices/platform/soc/12e00000.i2c/i2c-8/8-004b/uevent
OF_COMPATIBLE_0=atmel,maxtouch
OF_COMPATIBLE_1=generic,maxtouch
MODALIAS=i2c:maxtouch

3) Driver with an OF device ID table (with a "generic,maxtouch" entry)
and DTS defining a device node with a "atmel,maxtouch" compatible
string. This is the case when the driver patch is merged without the
DTS patches.

$ modinfo drivers/input/touchscreen/atmel_mxt_ts.ko | grep maxtouch
alias:          of:N*T*Cgeneric,maxtouchC*
alias:          of:N*T*Cgeneric,maxtouch
alias:          i2c:maxtouch

$ grep maxtouch /sys/devices/platform/soc/12e00000.i2c/i2c-8/8-004b/uevent
OF_COMPATIBLE_0=atmel,maxtouch
MODALIAS=i2c:maxtouch

4) Driver with an OF device ID table (with a "generic,maxtouch" entry)
and DTS defining a device node with a "atmel,maxtouch",
"generic,maxtouch" compatible string. This is the case when both the
DTS and driver patches are merged.

$ modinfo drivers/input/touchscreen/atmel_mxt_ts.ko | grep maxtouch
alias:          of:N*T*Cgeneric,maxtouchC*
alias:          of:N*T*Cgeneric,maxtouch
alias:          i2c:maxtouch

$ grep maxtouch /sys/devices/platform/soc/12e00000.i2c/i2c-8/8-004b/uevent
OF_COMPATIBLE_0=atmel,maxtouch
OF_COMPATIBLE_1=generic,maxtouch
MODALIAS=i2c:maxtouch

For all cases module autoload, driver probe and evtest worked for me.

You said that (3) doesn't work but I don't understand why is failing
for you. Probably I'm missing something.

Best regards,
Javier