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GPIO state cannot be changed via the device tree (e.g. with gpio-hog) or using the 'gpio' command from the console. The root cause is a discrepancy between the driver and the device tree: the driver code expects an absolute I/O address in the <reg> property, while the device tree defines the address relative to a declaration in the parent pinctrl node. Changing the device tree to fix a driver issue would normally be wrong, however: - I have run the first version of U-Boot in which this driver appears (v2016.03) and the same problem exists, so this is not a regression; - There is no code that references a parent device tree node that might suggest the intent of the author was to parse the DT as it exists now; - The equivalent Linux PIC32 GPIO driver also uses absolute addresses for the GPIO <reg> property. This change brings the U-Boot DT more into line with Linux. Additionally, the data sheet (Microchip ref. 60001361H) shows that the register set to control a GPIO bank spans 0xE0 bytes, but the device tree specified size is only 0x48 bytes. Signed-off-by: John Robertson <john.robertson@simiatec.com> |
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arc | ||
arm | ||
m68k | ||
microblaze | ||
mips | ||
nds32 | ||
nios2 | ||
powerpc | ||
riscv | ||
sandbox | ||
sh | ||
x86 | ||
xtensa | ||
.gitignore | ||
Kconfig | ||
u-boot-elf.lds |