dt-bindings: display: panel: mipi-dbi-spi: Add io-supply
Add documentation for the new io-supply property, which specifies the regulator for the I/O voltage supply on platforms where the panel panel power and I/O supplies are separate. Signed-off-by: Otto Pflüger <otto.pflueger@abscue.de> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/msgid/20221201160245.2093816-4-otto.pflueger@abscue.de
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