dt-bindings: gpio: Add binding for Versal gpio

Add binding for Versal binding.

Versal devices are the industry's first adaptive compute
acceleration platforms.
https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf

On the Versal platform, we are using two customized GPIO controllers(IP)
which were used in Zynq/ZynqMp platform.
One of them present in the Platform Management Controller(PMC) block and
other in Processing System(PS) block.

In PMC_GPIO only Bank0,1,3 & 4 are enabled and in PS_GPIO only
Bank 0 & 3 are enabled.

You can find more details of GPIO IP in ZynqMP TRM General Purpose
I/O(Chapter-27).
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index 4fa4eb5..4806d84 100644 (file)
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -6,7 +6,8 @@ Required properties:
                          - First cell is the GPIO line number
                          - Second cell is used to specify optional
                            parameters (unused)
-- compatible           : Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0"
+- compatible           : Should be "xlnx,zynq-gpio-1.0" or
+                         "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
 - clocks               : Clock specifier (see clock bindings for details)
 - gpio-controller      : Marks the device node as a GPIO controller.
 - interrupts           : Interrupt specifier (see interrupt bindings for