dt-bindings: mtd: Add bindings for TI's AM654 HyperBus memory controller

Add binding documentation for TI's HyperBus memory controller present on
AM654 SoC.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

diff --git a/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt b/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
new file mode 100644 (file)
index 0000000..faa81c2
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
@@ -0,0 +1,51 @@
+Bindings for HyperBus Memory Controller (HBMC) on TI's K3 family of SoCs
+
+Required properties:
+- compatible : "ti,am654-hbmc" for AM654 SoC
+- reg : Two entries:
+       First entry pointed to the register space of HBMC controller
+       Second entry pointing to the memory map region dedicated for
+       MMIO access to attached flash devices
+- ranges : Address translation from offset within CS to allocated MMIO
+          space in SoC
+
+Optional properties:
+- mux-controls : phandle to the multiplexer that controls selection of
+                HBMC vs OSPI inside Flash SubSystem (FSS). Default is OSPI,
+                if property is absent.
+                See Documentation/devicetree/bindings/mux/reg-mux.txt
+                for mmio-mux binding details
+
+Example:
+
+       system-controller@47000000 {
+               compatible = "syscon", "simple-mfd";
+               reg = <0x0 0x47000000 0x0 0x100>;
+               #address-cells = <2>;
+               #size-cells = <2>;
+               ranges;
+
+               hbmc_mux: multiplexer {
+                       compatible = "mmio-mux";
+                       #mux-control-cells = <1>;
+                       mux-reg-masks = <0x4 0x2>; /* 0: reg 0x4, bit 1 */
+               };
+       };
+
+       hbmc: hyperbus@47034000 {
+               compatible = "ti,am654-hbmc";
+               reg = <0x0 0x47034000 0x0 0x100>,
+                       <0x5 0x00000000 0x1 0x0000000>;
+               power-domains = <&k3_pds 55>;
+               #address-cells = <2>;
+               #size-cells = <1>;
+               ranges = <0x0 0x0 0x5 0x00000000 0x4000000>, /* CS0 - 64MB */
+                        <0x1 0x0 0x5 0x04000000 0x4000000>; /* CS1 - 64MB */
+               mux-controls = <&hbmc_mux 0>;
+
+               /* Slave flash node */
+               flash@0,0 {
+                       compatible = "cypress,hyperflash", "cfi-flash";
+                       reg = <0x0 0x0 0x4000000>;
+               };
+       };

diff --git a/MAINTAINERS b/MAINTAINERS
index f1253ad..b3eb961 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7311,6 +7311,7 @@ S:        Supported
 F:     drivers/mtd/hyperbus/
 F:     include/linux/mtd/hyperbus.h
 F:     Documentation/devicetree/bindings/mtd/cypress,hyperflash.txt
+F:     Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
 
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