powerpc: doc/dts-bindings: document mpc5121 psc uart dts-bindings
Support for MPC5121 PSC UART in the mpc52xx_uart driver added new DTS properties for FSL MPC5121 PSC FIFO Controller. Provide documentation of the new properties and some examples. Signed-off-by: NAnatolij Gustschin <agust@denx.de> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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