linux-kernel - [PATCH v2] Input: atmel_mxt_ts - add missing compatible strings to OF device table

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Date:   Tue, 1 May 2018 13:57:13 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-input@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Nick Dyer <nick@...anahar.org>,
        Mark Rutland <mark.rutland@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2] Input: atmel_mxt_ts - add missing compatible strings to
 OF device table

From: Javier Martinez Canillas <javierm@...hat.com>

Commit af503716ac14 ("i2c: core: report OF style module alias for devices
registered via OF") fixed how the I2C core reports the module alias when
devices are registered via OF.

But the atmel_mxt_ts driver only has an "atmel,maxtouch" compatible in its
OF device ID table, so if a Device Tree is using a different one, autoload
won't be working for the module (the matching works because the I2C device
ID table is used as a fallback).

So add compatible strings for each of the entries in the I2C device table.

Fixes: af503716ac14 ("i2c: core: report OF style module alias for devices registered via OF")
Reported-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
[dtor: document which compatibles are deprecated and should not be used]
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 .../devicetree/bindings/input/atmel,maxtouch.txt   |    7 +++++++
 drivers/input/touchscreen/atmel_mxt_ts.c           |    5 +++++
 2 files changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
index 23e3abc3fdef0..c88919480d373 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
@@ -4,6 +4,13 @@ Required properties:
 - compatible:
     atmel,maxtouch
 
+    The following compatibles have been used in various products but are
+    deprecated:
+	atmel,qt602240_ts
+	atmel,atmel_mxt_ts
+	atmel,atmel_mxt_tp
+	atmel,mXT224
+
 - reg: The I2C address of the device
 
 - interrupts: The sink for the touchpad's IRQ output
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 5f41c1860f403..779dbfcc0eded 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3297,6 +3297,11 @@ static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
 
 static const struct of_device_id mxt_of_match[] = {
 	{ .compatible = "atmel,maxtouch", },
+	/* Compatibles listed below are deprecated */
+	{ .compatible = "atmel,qt602240_ts", },
+	{ .compatible = "atmel,atmel_mxt_ts", },
+	{ .compatible = "atmel,atmel_mxt_tp", },
+	{ .compatible = "atmel,mXT224", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mxt_of_match);