Add documentation for new subnode properties, allowing bank configuration.
Based on u-boot implementation, but heavily reworked.
Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx>
---
.../bindings/arm/samsung/exynos-srom.txt | 50 +++++++++++++++++++++-
1 file changed, 48 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt
index 33886d5..02ecc7f 100644
--- a/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt
@@ -5,8 +5,54 @@ Required properties:
- reg: offset and length of the register set
-Example:
+- #address-cells, #size-cells : should be '1' if the device has sub-nodes
+ with 'reg' property.
+- ranges: allows valid 1:1 translation between child's address space and
+ parent's address space
+
+Sub-nodes:
+The SROM controller can be used to attach external peripherials. In this case
+device nodes should be added as subnodes to the SROMc node. These subnodes,
+except regular device specification, should contain the following properties,
+describing configuration of the relevant SROM bank:
+
+Required properties:
+- samsung,srom-bank : bank number (0 - 3)
+
+- samsung,srom-timing : array of 7 integers: PMC, Tacp, Tcah, Tcoh, Tacc, Tcos,
+ Tacs
+
+Optional properties:
+- samsung,srom-data-width : data width in bytes (1 or 2). If omitted, default
+ of 1 is used.
+
+Example: basic definition, no banks are configured
sromc@12570000 {
compatible = "samsung,exynos-srom";
- reg = <0x12570000 0x10>;
+ reg = <0x12570000 0x14>;
+ };
+
+Example: SROMc with smsc 911x ethernet chip on bank 3
+ sromc@12570000 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ compatible = "samsung,exynos-srom";
+ reg = <0x12570000 0x14>;
+
+ ethernet@07000000 {
+ compatible = "smsc,lan9115";
+ reg = <0x07000000 0x10000>;
+ phy-mode = "mii";
+ interrupt-parent = <&gpx0>;
+ interrupts = <5 8>;
+ reg-io-width = <2>;
+ smsc,irq-push-pull;
+ smsc,force-internal-phy;
+
+ samsung,srom-bank = <3>;
+ samsung,srom-data-width = <2>;
+ samsung,srom-timing = <1 9 12 1 9 1 1>;
+ };
};
--
2.4.4
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