mirror of
https://github.com/brain-hackers/u-boot-brain
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81b543a4e6
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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| .. | ||
| cpu | ||
| dts | ||
| include/asm | ||
| lib | ||
| mach-ath79 | ||
| mach-bmips | ||
| mach-jz47xx | ||
| mach-mscc | ||
| mach-mtmips | ||
| mach-octeon | ||
| mach-pic32 | ||
| config.mk | ||
| Kconfig | ||
| Makefile | ||
| Makefile.postlink | ||