linux-kernel - [PATCH v2 2/5] mfd: da9055: Fix platform device ids to avoid probe failure

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Date:	Fri, 20 Mar 2015 20:23:20 +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 v2 2/5] mfd: da9055: 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.

Changing mfd_add_devices() mfd id base from -1 to 0 and at the same
time setting proper cell ids for all cells fixes the issue.

Fixes: 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
Cc: Johan Hovold <johan@...nel.org>
Cc: Support Opensource <support.opensource@...semi.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
stable v3.19+

 drivers/mfd/da9055-core.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/da9055-core.c b/drivers/mfd/da9055-core.c
index b4d920c..4dbe752 100644
--- a/drivers/mfd/da9055-core.c
+++ b/drivers/mfd/da9055-core.c
@@ -298,6 +298,12 @@ static const struct mfd_cell da9055_devs[] = {
 	{
 		.of_compatible = "dlg,da9055-gpio",
 		.name = "da9055-gpio",
+		.id = -1,
+	},
+	{
+		.of_compatible = "dlg,da9055-regulator",
+		.name = "da9055-regulator",
+		.id = 0,
 	},
 	{
 		.of_compatible = "dlg,da9055-regulator",
@@ -327,43 +333,42 @@ static const struct mfd_cell da9055_devs[] = {
 	{
 		.of_compatible = "dlg,da9055-regulator",
 		.name = "da9055-regulator",
-		.id = 6,
-	},
-	{
-		.of_compatible = "dlg,da9055-regulator",
-		.name = "da9055-regulator",
-		.id = 7,
 		.resources = &da9055_ld05_6_resource,
 		.num_resources = 1,
+		.id = 6,
 	},
 	{
 		.of_compatible = "dlg,da9055-regulator",
 		.name = "da9055-regulator",
 		.resources = &da9055_ld05_6_resource,
 		.num_resources = 1,
-		.id = 8,
+		.id = 7,
 	},
 	{
 		.of_compatible = "dlg,da9055-onkey",
 		.name = "da9055-onkey",
 		.resources = &da9055_onkey_resource,
 		.num_resources = 1,
+		.id = -1,
 	},
 	{
 		.of_compatible = "dlg,da9055-rtc",
 		.name = "da9055-rtc",
 		.resources = da9055_rtc_resource,
 		.num_resources = ARRAY_SIZE(da9055_rtc_resource),
+		.id = -1,
 	},
 	{
 		.of_compatible = "dlg,da9055-hwmon",
 		.name = "da9055-hwmon",
 		.resources = &da9055_hwmon_resource,
 		.num_resources = 1,
+		.id = -1,
 	},
 	{
 		.of_compatible = "dlg,da9055-watchdog",
 		.name = "da9055-watchdog",
+		.id = -1,
 	},
 };
 
@@ -404,7 +409,7 @@ int da9055_device_init(struct da9055 *da9055)
 
 	da9055->irq_base = regmap_irq_chip_get_base(da9055->irq_data);
 
-	ret = mfd_add_devices(da9055->dev, -1,
+	ret = mfd_add_devices(da9055->dev, 0,
 			      da9055_devs, ARRAY_SIZE(da9055_devs),
 			      NULL, da9055->irq_base, NULL);
 	if (ret)
-- 
1.8.2.3

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