powerpc: Add device tree support for serial configuration #9029
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The dtc repository contains libfdt, which will be used by the powerpc port. Signed-off-by: Joel Stanley <joel@jms.id.au>
Used by libfdt. Signed-off-by: Joel Stanley <joel@jms.id.au>
Used by libfdt. Signed-off-by: Joel Stanley <joel@jms.id.au>
The powerpc port will use libfdt to handle machine specific settings, starting with the UART. Signed-off-by: Joel Stanley <joel@jms.id.au>
COPT is added to CFLAGS like other Makefiles, but it is never set. Signed-off-by: Joel Stanley <joel@jms.id.au>
The headers come from the microwatt repository: https://github.com/antonblanchard/microwatt/tree/master/include While the microwatt syscon may change in the future, it has been stable for some time. Signed-off-by: Joel Stanley <joel@jms.id.au>
When using standalone microwatt, use the syscon registers to detect the UART type and clock. This also gets the correct frequency for the processor timebase. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Joel Stanley <joel@jms.id.au>
It is no longer used. Signed-off-by: Joel Stanley <joel@jms.id.au>
If the device tree pointer is non-zero, use the device tree to select the correct uart based on the machine type. Signed-off-by: Joel Stanley <joel@jms.id.au>
mikey
reviewed
Aug 8, 2022
| @@ -229,6 +229,7 @@ function ci_powerpc_setup { | |||
| } | |||
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| function ci_powerpc_build { | |||
| make ${MAKEOPTS} -C ports/powerpc submodules | |||
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Should we be adding the "submodules" target to a Makefile dependency rather than calling it here?
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This adds the device tree compiler repository as a submodule to be used by the powerpc port to configure itself. Currently basic support for detecting the machine type is implemented, and this is used to apply hard coded serial port settings. In the future the port could use the device tree to dynamically configure the serial port, and other hardware.