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goldfish_timer_of_to_plat() currently returns success even when
dev_read_addr() fails to find a valid address. This leaves plat->reg
unset and defers the failure to probe().
Return -EINVAL immediately when the address is FDT_ADDR_T_NONE so the
failure is reported at the of_to_plat stage where it belongs. This
aligns the driver with the recent fix introduced in the goldfish
serial driver by Naveen Kumar Chaudhary. [1]
Link: https://lore.kernel.org/u-boot/vgwnt6mnls3lf3zdm6mz5siztzkvppte4ykszbvifjzukvmksf@maaxe5agqpim/ [1]
Signed-off-by: Kuan-Wei Chiu <[email protected]>
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The Goldfish timer registers are native endian, so they act as
big-endian on the m68k virt machine. Currently, this driver uses
readl(), which works by luck because it's currently broken on m68k.
Use __raw_readl() instead to avoid breaking this driver when the
endianness of readl() is fixed.
Signed-off-by: Kuan-Wei Chiu <[email protected]>
Tested-by: Daniel Palmer <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Daniel Palmer <[email protected]>
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Add support for the Goldfish timer driver. This driver utilizes the
Goldfish RTC hardware to provide a nanosecond-resolution timer. This
virtual device is commonly found in QEMU virtual machines (such as the
m68k virt machine) and Android emulators.
The driver implements the standard U-Boot timer UCLASS interface,
exposing a 64-bit monotonically increasing counter with a 1GHz clock
rate derived from the RTC registers.
Signed-off-by: Kuan-Wei Chiu <[email protected]>
Tested-by: Daniel Palmer <[email protected]>
Reviewed-by: Yao Zi <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Angelo Dureghello <[email protected]>
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