From: Andre Przywara andre.przywara@arm.com
[ Upstream commit e37ec32188701efa01455b9be42a392adab06ce4 ]
At the moment trying to register a second AXP chip makes the probe fail, as some sysfs registration fails due to a duplicate name:
... [ 3.688215] axp20x-i2c 0-0035: AXP20X driver loaded [ 3.695610] axp20x-i2c 0-0036: AXP20x variant AXP323 found [ 3.706151] sysfs: cannot create duplicate filename '/bus/platform/devices/axp20x-regulator' [ 3.714718] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-rc1-00026-g50bf2e2c079d-dirty #192 [ 3.724020] Hardware name: Avaota A1 (DT) [ 3.728029] Call trace: [ 3.730477] dump_backtrace+0x94/0xec [ 3.734146] show_stack+0x18/0x24 [ 3.737462] dump_stack_lvl+0x80/0xf4 [ 3.741128] dump_stack+0x18/0x24 [ 3.744444] sysfs_warn_dup+0x64/0x80 [ 3.748109] sysfs_do_create_link_sd+0xf0/0xf8 [ 3.752553] sysfs_create_link+0x20/0x40 [ 3.756476] bus_add_device+0x64/0x104 [ 3.760229] device_add+0x310/0x760 [ 3.763717] platform_device_add+0x10c/0x238 [ 3.767990] mfd_add_device+0x4ec/0x5c8 [ 3.771829] mfd_add_devices+0x88/0x11c [ 3.775666] axp20x_device_probe+0x70/0x184 [ 3.779851] axp20x_i2c_probe+0x9c/0xd8 ...
This is because we use PLATFORM_DEVID_NONE for the mfd_add_devices() call, which would number the child devices in the same 0-based way, even for the second (or any other) instance.
Use PLATFORM_DEVID_AUTO instead, which automatically assigns non-conflicting device numbers.
Signed-off-by: Andre Przywara andre.przywara@arm.com Reviewed-by: Chen-Yu Tsai wens@csie.org Link: https://lore.kernel.org/r/20241007001408.27249-4-andre.przywara@arm.com Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/axp20x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c index 8161a5dc68e84..f5218623fb979 100644 --- a/drivers/mfd/axp20x.c +++ b/drivers/mfd/axp20x.c @@ -991,7 +991,7 @@ int axp20x_device_probe(struct axp20x_dev *axp20x) } }
- ret = mfd_add_devices(axp20x->dev, -1, axp20x->cells, + ret = mfd_add_devices(axp20x->dev, PLATFORM_DEVID_AUTO, axp20x->cells, axp20x->nr_cells, NULL, 0, NULL);
if (ret) {