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 Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx> --- drivers/nvmem/qfprom.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c index 8a91717600be..ceb837e861d8 100644 --- a/drivers/nvmem/qfprom.c +++ b/drivers/nvmem/qfprom.c @@ -40,6 +40,7 @@ static int qfprom_probe(struct platform_device *pdev) struct resource *res; struct nvmem_device *nvmem; struct qfprom_priv *priv; + static int id; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -52,6 +53,7 @@ static int qfprom_probe(struct platform_device *pdev) econfig.size = resource_size(res); econfig.dev = dev; + econfig.id = id++; econfig.priv = priv; nvmem = devm_nvmem_register(dev, &econfig); -- 2.17.1
