linux-kernel - [PATCH v3 3/4] mfd: lp8788: Fix platform device ids to avoid probe failure

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Date:	Mon, 23 Mar 2015 16:09:06 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	Johan Hovold <johan@...nel.org>,
	Support Opensource <support.opensource@...semi.com>,
	Milo Kim <milo.kim@...com>,
	patches@...nsource.wolfsonmicro.com,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
	stable@...r.kernel.org
Subject: [PATCH v3 3/4] mfd: lp8788: Fix platform device ids to avoid probe
 failure

Commit 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
changed the way platform device ids are generated from mfd id base and
cell ids in mfd_add_device().  Unfortunately the change in question
breaks mfd drivers which are using mfd_add_devices() with mfd id base
equal to -1 and non-zero cell ids (used to distinguish cells with
the same name field).  The result is that mfd core tries to register
platform devices with the same name which obviously fails and leads
to mfd device probe failure.

Change mfd_add_devices() mfd id base from -1 to PLATFORM_DEVID_AUTO
to fix the issue.

Fixes: 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
Cc: Johan Hovold <johan@...nel.org>
Cc: Milo Kim <milo.kim@...com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
 drivers/mfd/lp8788.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/lp8788.c b/drivers/mfd/lp8788.c
index a30bc15..1486bd0 100644
--- a/drivers/mfd/lp8788.c
+++ b/drivers/mfd/lp8788.c
@@ -199,7 +199,7 @@ static int lp8788_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 	if (ret)
 		return ret;
 
-	return mfd_add_devices(lp->dev, -1, lp8788_devs,
+	return mfd_add_devices(lp->dev, PLATFORM_DEVID_AUTO, lp8788_devs,
 			       ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);
 }
 
-- 
1.7.9.5

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