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Subject[PATCH 2/2] nvmem: qfprom: use NVMEM_DEVID_AUTO for multiple instances
Date
There could be multiple qfprom devices on some SoCs.  For example, on
MSM8939, qfprom@58000 holds efuse bits for Core Power Reduction (CPR),
and qfprom@5c000 holds bits for TSENS. Registering multiple nvmem
devices with the same id results in the following failure on the second
device.

[ 1.682731] sysfs: cannot create duplicate filename '/bus/nvmem/devices/qfprom0'
[ 1.685889] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.107-00567-g11c887ce2838-dirty #334
[ 1.693191] Hardware name: Square, Inc. T2 Devkit (DT)
[ 1.701610] Call trace:
[ 1.706673] dump_backtrace+0x0/0x158
[ 1.708987] show_stack+0x14/0x20
[ 1.712810] dump_stack+0x98/0xbc
[ 1.716114] sysfs_warn_dup+0x60/0x78
[ 1.719401] sysfs_do_create_link_sd.isra.0+0xdc/0xe8
[ 1.723047] sysfs_create_link+0x20/0x40
[ 1.728088] bus_add_device+0x68/0x130
[ 1.732083] device_add+0x3f8/0x628
[ 1.735639] nvmem_register.part.4+0x150/0x348
[ 1.739018] devm_nvmem_register+0x4c/0xa8
[ 1.743532] qfprom_probe+0x94/0xb8
[ 1.747615] platform_drv_probe+0x50/0xa0
[ 1.750998] really_probe+0x1b8/0x298
[ 1.755164] driver_probe_device+0x58/0x100
[ 1.758810] __driver_attach+0xe0/0xe8
[ 1.762802] bus_for_each_dev+0x74/0xc8
[ 1.766622] driver_attach+0x20/0x28
[ 1.770354] bus_add_driver+0x1ac/0x218
[ 1.774175] driver_register+0x60/0x110
[ 1.777734] __platform_driver_register+0x40/0x48
[ 1.781570] qfprom_driver_init+0x18/0x20
[ 1.786416] do_one_initcall+0x5c/0x178
[ 1.790418] kernel_init_freeable+0x198/0x244
[ 1.794062] kernel_init+0x10/0x108
[ 1.798567] ret_from_fork+0x10/0x18
[ 1.802084] qcom,qfprom: probe of 5c000.qfprom failed with error -17

Fix this issue by using NVMEM_DEVID_AUTO.

Reported-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/nvmem/qfprom.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
index 8a91717600be..8b425f8d847d 100644
--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -31,6 +31,7 @@ static struct nvmem_config econfig = {
.name = "qfprom",
.stride = 1,
.word_size = 1,
+ .id = NVMEM_DEVID_AUTO,
.reg_read = qfprom_reg_read,
};

--
2.21.0
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