Hi Neil, On Wed, Nov 15, 2023 at 06:17:50PM +0100, Neil Armstrong wrote: > Hi Sebastian, > > On 04/05/2023 19:36, Sebastian Reichel wrote: > > Add support for SPI connected rk806, which is used by the RK3588 > > evaluation boards. The PMIC is advertised to support I2C and SPI, > > but the evaluation boards all use SPI. Thus only SPI support is > > added here. > > > > Acked-for-MFD-by: Lee Jones <lee@xxxxxxxxxx> > > Tested-by: Diederik de Haas <didi.debian@xxxxxxxxx> # Rock64, Quartz64 Model A + B > > Tested-by: Vincent Legoll <vincent.legoll@xxxxxxxxx> # Pine64 QuartzPro64 > > Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> > > --- > > drivers/mfd/Kconfig | 14 ++ > > drivers/mfd/Makefile | 1 + > > drivers/mfd/rk8xx-core.c | 69 ++++++- > > drivers/mfd/rk8xx-spi.c | 124 ++++++++++++ > > include/linux/mfd/rk808.h | 409 ++++++++++++++++++++++++++++++++++++++ > > 5 files changed, 614 insertions(+), 3 deletions(-) > > create mode 100644 drivers/mfd/rk8xx-spi.c > > > > <snip> > > > - ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, > > - cells, nr_cells, NULL, 0, > > + ret = devm_mfd_add_devices(dev, 0, cells, nr_cells, NULL, 0, > > regmap_irq_get_domain(rk808->irq_data)); > > It seems you replaced PLATFORM_DEVID_NONE by 0, triggering again the bug preventing > having multiples RK pmics on the same system I fixed earlier at [1]. All cells have PLATFORM_DEVID_NONE specified and thus are registered without an ID. I changed this bit to avoid overriding the information, since I did not want to have PLATFORM_DEVID_NONE for rk806. > This gives (again): > <4>[ 0.664107] sysfs: cannot create duplicate filename '/bus/platform/devices/rk808-clkout' Which means, you do not want PLATFORM_DEVID_NONE (-1), but PLATFORM_DEVID_AUTO (-2). The above path is the expected path for PLATFORM_DEVID_NONE. > <4>[ 0.664120] CPU: 3 PID: 97 Comm: kworker/u12:2 Not tainted 6.6.1 #1 > <4>[ 0.664131] Hardware name: Hardkernel ODROID-GO-Ultra (DT) > <4>[ 0.664139] Workqueue: events_unbound deferred_probe_work_func > <4>[ 0.664160] Call trace: > <4>[ 0.664165] dump_backtrace+0x9c/0x11c > <4>[ 0.664181] show_stack+0x18/0x24 > <4>[ 0.664193] dump_stack_lvl+0x78/0xc4 > <4>[ 0.664205] dump_stack+0x18/0x24 > <4>[ 0.664215] sysfs_warn_dup+0x64/0x80 > <4>[ 0.664227] sysfs_do_create_link_sd+0xf0/0xf8 > <4>[ 0.664239] sysfs_create_link+0x20/0x40 > <4>[ 0.664250] bus_add_device+0x114/0x160 > <4>[ 0.664259] device_add+0x3f0/0x7cc > <4>[ 0.664267] platform_device_add+0x180/0x270 > <4>[ 0.664278] mfd_add_device+0x390/0x4a8 > <4>[ 0.664290] devm_mfd_add_devices+0xb0/0x150 > <4>[ 0.664301] rk8xx_probe+0x26c/0x410 > <4>[ 0.664312] rk8xx_i2c_probe+0x64/0x98 > <4>[ 0.664323] i2c_device_probe+0x104/0x2e8 > <4>[ 0.664333] really_probe+0x184/0x3c8 > <4>[ 0.664342] __driver_probe_device+0x7c/0x16c > <4>[ 0.664351] driver_probe_device+0x3c/0x10c > <4>[ 0.664360] __device_attach_driver+0xbc/0x158 > <4>[ 0.664369] bus_for_each_drv+0x80/0xdc > <4>[ 0.664377] __device_attach+0x9c/0x1ac > <4>[ 0.664386] device_initial_probe+0x14/0x20 > <4>[ 0.664395] bus_probe_device+0xac/0xb0 > <4>[ 0.664403] deferred_probe_work_func+0xa0/0xf4 > <4>[ 0.664412] process_one_work+0x1bc/0x378 > <4>[ 0.664421] worker_thread+0x1dc/0x3d4 > <4>[ 0.664429] kthread+0x104/0x118 > <4>[ 0.664440] ret_from_fork+0x10/0x20 > <3>[ 0.664494] rk8xx-i2c 0-001c: error -EEXIST: failed to add MFD devices > <4>[ 0.666769] rk8xx-i2c: probe of 0-001c failed with error -17 I didn't notice when working on rk806, but after analyzing it now: Your patch effectively set the cells to PLATFORM_DEVID_AUTO, because you set all cells to PLATFORM_DEVID_NONE (-1) and additionally used PLATFORM_DEVID_NONE (-1) for the devm_mfd_add_devices() call. But that uses the sum of both IDs. Adding -1 to -1 is -2 and thus PLATFORM_DEVID_AUTO. This is of course very confusing and just worked by chance. There are two options: 1. Modify all cells to use PLATFORM_DEVID_AUTO instead of PLATFORM_DEVID_NONE 2. Drop the .id from all cells and use PLATFORM_DEVID_AUTO in the call to devm_mfd_add_devices() Note, that switching from PLATFORM_DEVID_NONE to PLATFORM_DEVID_AUTO modifies sysfs paths and thus might break people's scripts; that's why I tried not to modify any existing platform. I will let you deal with that, since I cannot even test any !rk806 platform supported by this driver :) Also mfd_add_device should probably get special handling for PLATFORM_DEVID_NONE, just like it already has special handling for PLATFORM_DEVID_AUTO. Greetings, -- Sebastian
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