dt-bindings: Remove PicoXcell bindings

PicoXcell has had nothing but treewide cleanups for at least the last 8
years and no signs of activity. The most recent activity is a yocto vendor
kernel based on v3.0 in 2015.

Cc: linux-crypto@vger.kernel.org
Acked-by: Jamie Iles <jamie@jamieiles.com>
Link: https://lore.kernel.org/r/20201210200315.2965567-5-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/picoxcell.txt

@@ -1,24 +0,0 @@
-Picochip picoXcell device tree bindings.
-========================================
-
-Required root node properties:
-    - compatible:
-	- "picochip,pc7302-pc3x3" : PC7302 development board with PC3X3 device.
-	- "picochip,pc7302-pc3x2" : PC7302 development board with PC3X2 device.
-	- "picochip,pc3x3" : picoXcell PC3X3 device based board.
-	- "picochip,pc3x2" : picoXcell PC3X2 device based board.
-
-Timers required properties:
-    - compatible = "picochip,pc3x2-timer"
-    - interrupts : The single IRQ line for the timer.
-    - clock-freq : The frequency in HZ of the timer.
-    - reg : The register bank for the timer.
-
-Note: two timers are required - one for the scheduler clock and one for the
-event tick/NOHZ.
-
-VIC required properties:
-    - compatible = "arm,pl192-vic".
-    - interrupt-controller.
-    - reg : The register bank for the device.
-    - #interrupt-cells : Must be 1.

Documentation/devicetree/bindings/crypto/picochip-spacc.txt

@@ -1,21 +0,0 @@
-Picochip picoXcell SPAcc (Security Protocol Accelerator) bindings
-
-Picochip picoXcell devices contain crypto offload engines that may be used for
-IPSEC and femtocell layer 2 ciphering.
-
-Required properties:
-  - compatible : "picochip,spacc-ipsec" for the IPSEC offload engine
-    "picochip,spacc-l2" for the femtocell layer 2 ciphering engine.
-  - reg : Offset and length of the register set for this device
-  - interrupts : The interrupt line from the SPAcc.
-  - ref-clock : The input clock that drives the SPAcc.
-
-Example SPAcc node:
-
-spacc@10000 {
-	compatible = "picochip,spacc-ipsec";
-	reg = <0x100000 0x10000>;
-	interrupt-parent = <&vic0>;
-	interrupts = <24>;
-	ref-clock = <&ipsec_clk>, "ref";
-};

Documentation/devicetree/bindings/net/macb.txt

@@ -7,8 +7,6 @@ Required properties:
   Use "cdns,sam9x60-macb" for Microchip sam9x60 SoC.
   Use "cdns,np4-macb" for NP4 SoC devices.
   Use "cdns,at32ap7000-macb" for other 10/100 usage or use the generic form: "cdns,macb".
-  Use "cdns,pc302-gem" for Picochip picoXcell pc302 and later devices based on
-  the Cadence GEM, or the generic form: "cdns,gem".
   Use "atmel,sama5d2-gem" for the GEM IP (10/100) available on Atmel sama5d2 SoCs.
   Use "atmel,sama5d3-macb" for the 10/100Mbit IP available on Atmel sama5d3 SoCs.
   Use "atmel,sama5d3-gem" for the Gigabit IP available on Atmel sama5d3 SoCs.

Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml

@@ -38,13 +38,6 @@ properties:
 
   clock-frequency: true
 
-  clock-freq:
-    $ref: "/schemas/types.yaml#/definitions/uint32"
-    description: |
-      Has the same meaning as the 'clock-frequency' property - timer clock
-      frequency in HZ, but is defined only for the backwards compatibility
-      with the picoxcell platform.
-
 additionalProperties: false
 
 required: