For pins requiring software driven IO output operations, the RZ/A1 Pin
Controller uses either the "output-high" or "output-low" DT property to
enable the corresponding output buffer. The actual line value doesn't
matter, as it is ignored.
Commit
425562429d4f3b13 ("pinctrl: generic: Add output-enable property")
introduced a new DT property for this specific use case.
Update the RZ/A1 Pin Controller DT bindings and driver to use this new
property instead. Preserve backwards compatibility with old DTBs in the
driver, as this comes at a very small cost.
Notes:
- The DT binding examples already used the new property,
- There are no upstream users of the old properties.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Chris Brandt <chris.brandt@renesas.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200821111401.4021-1-geert+renesas@glider.be
- input-enable:
enable input bufer for pins requiring software driven IO input
operations.
- - output-high:
+ - output-enable:
enable output buffer for pins requiring software driven IO output
- operations. output-low can be used alternatively, as line value is
- ignored by the driver.
+ operations.
The hardware reference manual specifies when a pin has to be configured to
work in bi-directional mode and when the IO direction has to be specified
case PIN_CONFIG_INPUT_ENABLE:
pinmux_flags |= MUX_FLAGS_SWIO_INPUT;
break;
- case PIN_CONFIG_OUTPUT:
+ case PIN_CONFIG_OUTPUT: /* for DT backwards compatibility */
+ case PIN_CONFIG_OUTPUT_ENABLE:
pinmux_flags |= MUX_FLAGS_SWIO_OUTPUT;
default:
break;