eeprom: Add IDT 89HPESx driver bindings file

IDT 89HPESx PCIe-switches exposes SMBus interface to have an access to
the device CSRs and EEPROM. So to properly utilize the interface
functionality, developer should declare a valid dts-file node, which
would refer to the corresponding 89HPESx device.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/misc/idt_89hpesx.txt b/Documentation/devicetree/bindings/misc/idt_89hpesx.txt
new file mode 100644 (file)
index 0000000..b9093b7
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/idt_89hpesx.txt
@@ -0,0 +1,44 @@
+EEPROM / CSR SMBus-slave interface of IDT 89HPESx devices
+
+Required properties:
+  - compatible : should be "<manufacturer>,<type>"
+                Basically there is only one manufacturer: idt, but some
+                compatible devices may be produced in future. Following devices
+                are supported: 89hpes8nt2, 89hpes12nt3, 89hpes24nt6ag2,
+                89hpes32nt8ag2, 89hpes32nt8bg2, 89hpes12nt12g2, 89hpes16nt16g2,
+                89hpes24nt24g2, 89hpes32nt24ag2, 89hpes32nt24bg2;
+                89hpes12n3, 89hpes12n3a, 89hpes24n3, 89hpes24n3a;
+                89hpes32h8, 89hpes32h8g2, 89hpes48h12, 89hpes48h12g2,
+                89hpes48h12ag2, 89hpes16h16, 89hpes22h16, 89hpes22h16g2,
+                89hpes34h16, 89hpes34h16g2, 89hpes64h16, 89hpes64h16g2,
+                89hpes64h16ag2;
+                89hpes12t3g2, 89hpes24t3g2, 89hpes16t4, 89hpes4t4g2,
+                89hpes10t4g2, 89hpes16t4g2, 89hpes16t4ag2, 89hpes5t5,
+                89hpes6t5, 89hpes8t5, 89hpes8t5a, 89hpes24t6, 89hpes6t6g2,
+                89hpes24t6g2, 89hpes16t7, 89hpes32t8, 89hpes32t8g2,
+                89hpes48t12, 89hpes48t12g2.
+  - reg :       I2C address of the IDT 89HPESx device.
+
+Optionally there can be EEPROM-compatible subnode:
+  - compatible:  There are five EEPROM devices supported: 24c32, 24c64, 24c128,
+                24c256 and 24c512 differed by size.
+  - reg:         Custom address of EEPROM device (If not specified IDT 89HPESx
+    (optional)  device will try to communicate with EEPROM sited by default
+                address - 0x50)
+  - read-only :         Parameterless property disables writes to the EEPROM
+    (optional)
+
+Example:
+       idt@60 {
+               compatible = "idt,89hpes32nt8ag2";
+               reg = <0x74>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               eeprom@50 {
+                       compatible = "onsemi,24c64";
+                       reg = <0x50>;
+                       read-only;
+               };
+       };
+