dt-bindings: nvmem: sfp: Add TA_PROG_SFP supply

The TA_PROG_SFP supply must be enabled to program the fuses, and
disabled to read the fuses (such as at power-on-reset). On many boards,
this supply is controlled by a jumper. The user must manually insert or
remove it at the appropriate time in the programming process. However,
on other boards this supply is controlled by an FPGA or a GPIO. In
these cases, the driver can automatically enable and disable it as
necessary.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220429162701.2222-14-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml

@@ -32,6 +32,11 @@ properties:
   clock-names:
     const: sfp
 
+  ta-prog-sfp-supply:
+    description:
+      The regulator for the TA_PROG_SFP pin. It will be enabled for programming
+      and disabled for reading.
+
 required:
   - compatible
   - reg