Hi Igor
Subject: pmic_get() broken after 4213609cc7("drivers: core: use strcmp when find device by name")
Hi,
Today found out that U-boot isn't booting anymore on Colibri iMX7 and hangs with: U-Boot 2019.07-00788-g0ef6e69a1e-dirty (Jul 19 2019 - 15:27:02 +0300)
CPU: Freescale i.MX7D rev1.3 1000 MHz (running at 792 MHz) CPU: Extended Commercial temperature grade (-20C to 105C) at 41C Reset cause: POR DRAM: 512 MiB initcall sequence 9ffd3a4c failed at call 87803c61 (err=-19) ### ERROR ### Please RESET the board ###
Bisected to 4213609cc7("drivers: core: use strcmp when find device by name"), which changes the behavior of uclass_find_device_by_name().
The problem is that implementation of pmic_get() from drivers/power/pmic/pmic-uclass.c calls this changed uclass_find_device_by_name(), and as a param supplies node name without unit address (just checked it out, seems this how it's used on a lot of platforms, `grep -e pmic_get -r --include *.c ./` , so I assume that not only one platform is broken now).
In our case the node is defined as:
rn5t567@33 { compatible = "ricoh,rn5t567"; reg = <0x33>; };
and after pmic_get("rn5t567"), in uclass_find_device_by_name():
uclass_foreach_dev(dev, uc) { if (!strcmp(dev->name, name)) { *devp = dev; return 0; }
now dev->name == "rn5t567@33", name == "rn5t567", and it never finds a proper device.
The question is: should this be addressed but changingall invocations of pmic_get() (by concatenating to the string a proper unit address), and should we re-implement pmic_get(), so it can accept as a param only a node name without unit address?
I think need to fix all users of uclass_find_device_by_name with passing the real device name, but not part of the name.
Regards, Peng.
-- Best regards - Freundliche Grüsse - Meilleures salutations
Igor Opaniuk
mailto: igor.opaniuk@gmail.com skype: igor.opanyuk +380 (93) 836 40 67 https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fua.linke din.com%2Fin%2Fiopaniuk&data=02%7C01%7Cpeng.fan%40nxp.com%7 C836e8e55dd96453858a008d70c49d407%7C686ea1d3bc2b4c6fa92cd99c5c 301635%7C0%7C0%7C636991383533016404&sdata=yKTqMEPO9OY%2 FRioLKVU6ZYBZSqqh6IxfMkQLxzRCzjo%3D&reserved=0