Add binding documentation for TI's HyperBus memory controller present on
AM654 SoC.
Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx>
---
v5:
Update binding example to show MMIO mux
Fix reg property for flash slave.
.../devicetree/bindings/mtd/ti,am654-hbmc.txt | 51 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
diff --git a/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt b/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
new file mode 100644
index 000000000000..c2a2c2b42a92
--- /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. Default is OSPI,
+ if property is absent.
+ See Documentation/devicetree/bindings/mux/reg-mux.txt
+ for mmio-mux binding details
+
+Example:
+
+ fss: fss@47000000 {
+ compatible = "syscon", "simple-mfd";
+ reg = <0x0 0x47000000 0x0 0x100>;
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ hbmc_mux: hbmc-mux {
+ compatible = "mmio-mux";
+ #mux-control-cells = <1>;
+ mux-reg-masks = <0x4 0x2>; /* 0: reg 0x4, bit 1 */
+ };
+
+ hbmc: hbmc@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 258cf0d9eb8f..d6773a8e3ba2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7344,6 +7344,7 @@ 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
HYPERVISOR VIRTUAL CONSOLE DRIVER
L: linuxppc-dev@xxxxxxxxxxxxxxxx
--
2.21.0
