While debugging kernel stack trace from bug report[1], on openSUSE Tumbleweed, which uses vendor devicetree, I have found that rmem driver lack support for multiple rmem devices. Following patches add new devicetree node, its documentation and support for it in rmem driver. [1] https://bugzilla.suse.com/show_bug.cgi?id=1206846 -- [ 9.831285] sysfs: cannot create duplicate filename '/bus/nvmem/devices/rmem0' [ 9.831304] CPU: 3 PID: 467 Comm: (udev-worker) Not tainted 6.2.9-1-default #1 openSUSE Tumbleweed a4aeb3a90c0f23041a8a7944b12739b07585f009 [ 9.831326] Hardware name: raspberrypi rpi/rpi, BIOS 2023.01 01/01/2023 [ 9.831335] Call trace: [ 9.831343] dump_backtrace+0xe4/0x140 [ 9.831366] show_stack+0x20/0x30 [ 9.831379] dump_stack_lvl+0x64/0x80 [ 9.831398] dump_stack+0x18/0x34 [ 9.831410] sysfs_warn_dup+0x6c/0x90 [ 9.831424] sysfs_do_create_link_sd+0xf8/0x100 [ 9.831437] sysfs_create_link+0x28/0x50 [ 9.831449] bus_add_device+0x70/0x190 [ 9.831468] device_add+0x3e8/0x84c [ 9.831481] nvmem_register+0x85c/0x9f0 [ 9.831500] devm_nvmem_register+0x24/0x70 [ 9.831517] rmem_probe+0xa0/0xf4 [nvmem_rmem 649243b01e5e28ee94e4dd53bd13b6ececa836f8] [ 9.831555] platform_probe+0x70/0xd0 [ 9.831566] really_probe+0xc8/0x3e4 [ 9.831582] __driver_probe_device+0x84/0x190 [ 9.831598] driver_probe_device+0x44/0x11c [ 9.831613] __driver_attach+0xf8/0x200 [ 9.831629] bus_for_each_dev+0x78/0xd0 [ 9.831643] driver_attach+0x2c/0x40 [ 9.831657] bus_add_driver+0x188/0x250 [ 9.831672] driver_register+0x80/0x13c [ 9.831688] __platform_driver_register+0x30/0x40 [ 9.831699] rmem_driver_init+0x28/0x1000 [nvmem_rmem 649243b01e5e28ee94e4dd53bd13b6ececa836f8] [ 9.831727] do_one_initcall+0x48/0x2bc [ 9.831740] do_init_module+0x50/0x1f0 [ 9.831753] load_module+0x1e54/0x2250 [ 9.831763] __do_sys_init_module+0x2ac/0x2f0 [ 9.831774] __arm64_sys_init_module+0x24/0x30 [ 9.831785] invoke_syscall+0x78/0x100 [ 9.831803] el0_svc_common.constprop.0+0x15c/0x180 [ 9.831820] do_el0_svc+0x40/0xb0 [ 9.831836] el0_svc+0x34/0x134 [ 9.831850] el0t_64_sync_handler+0x114/0x120 [ 9.831865] el0t_64_sync+0x1a4/0x1a8 [ 9.831956] rmem: probe of 3ef62ce0.nvram failed with error -17 -- Changes since v2 https://lore.kernel.org/all/20230413085206.149730-1-iivanov@xxxxxxx/ - Add devicetree bindings documentation patch -- Changes since v1 https://lore.kernel.org/all/20230411135035.106725-1-iivanov@xxxxxxx/ I dig into Raspberry Github repository and found original patches from Tim and Phil which add new region and fix rmem driver. - Use NVMEM_DEVID_AUTO instead making region name unique from the driver itself. - Add devicetree node for BCM2711 bootloader public key. -- Ivan T. Ivanov (1): dt-bindings: nvmem: rmem: Add raspberrypi,bootloader-public-key Phil Elwell (1): nvmem: rmem: Use NVMEM_DEVID_AUTO Tim Gover (1): ARM: dts: Add nvmem node for BCM2711 bootloader public key Documentation/devicetree/bindings/nvmem/rmem.yaml | 1 + arch/arm/boot/dts/bcm2711-rpi.dtsi | 14 ++++++++++++++ drivers/nvmem/rmem.c | 1 + 3 files changed, 16 insertions(+) -- 2.35.3
