clk, clk-si5341: Support multiple input ports
The Si5341 and Si5340 have multiple input clock options. So far, the driver only supported the XTAL input, this adds support for the three external clock inputs as well. If the clock chip isn't programmed at boot, the driver will default to the XTAL input as before. If there is no "xtal" clock input available, it will pick the first connected input (e.g. "in0") as the input clock for the PLL. One can use clock-assigned-parents to select a particular clock as input. Signed-off-by: NMike Looijmans <mike.looijmans@topic.nl> Link: https://lkml.kernel.org/r/20200107075340.14528-1-mike.looijmans@topic.nlSigned-off-by: NStephen Boyd <sboyd@kernel.org> State: upstream (69275187)
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