[PATCH v4 1/2] dt-bindings: soc: fsl: Document Qixis FPGA usage

[Pankaj Bansal]

an FPGA-based system controller, called “Qixis”, which
manages several critical system features, including:
• Reset sequencing
• Power supply configuration
• Board configuration
• hardware configuration

The qixis registers are accessible over one or more system-specific
interfaces, typically I2C, JTAG or an embedded processor.

Signed-off-by: Pankaj Bansal <pankaj.bansal at nxp.com>
---

Notes:
    V4:
    - No Change
    V3:
    - Added boardname based compatible field in bindings
    - Added bindings for MMIO based FPGA
    V2:
    - No change

 .../bindings/soc/fsl/qixis_ctrl.txt          | 53 ++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/fsl/qixis_ctrl.txt b/Documentation/devicetree/bindings/soc/fsl/qixis_ctrl.txt
new file mode 100644
index 000000000000..5d510df14be8
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/fsl/qixis_ctrl.txt
@@ -0,0 +1,53 @@
+* QIXIS FPGA block
+
+an FPGA-based system controller, called “Qixis”, which
+manages several critical system features, including:
+• Configuration switch monitoring
+• Power on/off sequencing
+• Reset sequencing
+• Power supply configuration
+• Board configuration
+• hardware configuration
+• Background power data collection (DCM)
+• Fault monitoring
+• RCW bypass SRAM (replace flash RCW with internal RCW) (NOR only)
+• Dedicated functional validation blocks (POSt/IRS, triggered event, and so on)
+• I2C master for remote board control even with no DUT available
+
+The qixis registers are accessible over one or more system-specific interfaces,
+typically I2C, JTAG or an embedded processor.
+
+FPGA connected to I2C:
+Required properties:
+
+ - compatible: should be a board-specific string followed by a string
+   indicating the type of FPGA.  Example:
+	"fsl,<board>-fpga", "fsl,fpga-qixis-i2c"
+ - reg : i2c address of the qixis device.
+
+Example (LX2160A-QDS):
+	/* The FPGA node */
+        fpga at 66 {
+		compatible = "fsl,lx2160aqds-fpga", "fsl,fpga-qixis-i2c";
+		reg = <0x66>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	}
+
+* Freescale on-board FPGA
+
+This is the memory-mapped registers for on board FPGA.
+
+Required properties:
+- compatible: should be a board-specific string followed by a string
+  indicating the type of FPGA.  Example:
+	"fsl,<board>-fpga", "fsl,fpga-qixis"
+- reg: should contain the address and the length of the FPGA register set.
+
+Example (LS2080A-RDB):
+
+        cpld at 3,0 {
+                compatible = "fsl,ls2080ardb-fpga", "fsl,fpga-qixis";
+                reg = <0x3 0 0x10000>;
+        };
+
-- 
2.17.1