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authorVignesh R <vigneshr@ti.com>2015-09-14 10:54:33 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-05 04:47:09 +0100
commite93762bbf68143594223024532fdeef71f5e8f75 (patch)
tree3d3a334353e7131a5a3777a586a9dfc4cf35a537 /Documentation
parent5052436dcb7eac532cf2ffd6650be01d3f15e0b5 (diff)
w1: masters: omap_hdq: add support for 1-wire mode
This patches makes following changes to omap_hdq driver - Enable 1-wire mode. - Implement w1_triplet callback to facilitate search rom procedure and auto detection of 1-wire slaves. - Proper enabling and disabling of interrupt. - Cleanups (formatting and return value checks). HDQ mode remains unchanged. Signed-off-by: Vignesh R <vigneshr@ti.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: Jonathan Corbet <corbet@lwn.net> CC: Tony Lindgren <tony@atomide.com> Cc: Vignesh R <vigneshr@ti.com> Cc: NeilBrown <neilb@suse.de> Cc: Fabian Frederick <fabf@skynet.be> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/w1/omap-hdq.txt7
-rw-r--r--Documentation/w1/masters/omap-hdq6
2 files changed, 12 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/w1/omap-hdq.txt b/Documentation/devicetree/bindings/w1/omap-hdq.txt
index fef794741bd1..913c5f91a0f9 100644
--- a/Documentation/devicetree/bindings/w1/omap-hdq.txt
+++ b/Documentation/devicetree/bindings/w1/omap-hdq.txt
@@ -1,11 +1,15 @@
* OMAP HDQ One wire bus master controller
Required properties:
-- compatible : should be "ti,omap3-1w"
+- compatible : should be "ti,omap3-1w" or "ti,am4372-hdq"
- reg : Address and length of the register set for the device
- interrupts : interrupt line.
- ti,hwmods : "hdq1w"
+Optional properties:
+- ti,mode: should be "hdq": HDQ mode "1w": one-wire mode.
+ If not specified HDQ mode is implied.
+
Example:
- From omap3.dtsi
@@ -14,4 +18,5 @@ Example:
reg = <0x480b2000 0x1000>;
interrupts = <58>;
ti,hwmods = "hdq1w";
+ ti,mode = "hdq";
};
diff --git a/Documentation/w1/masters/omap-hdq b/Documentation/w1/masters/omap-hdq
index 884dc284b215..234522709a5f 100644
--- a/Documentation/w1/masters/omap-hdq
+++ b/Documentation/w1/masters/omap-hdq
@@ -44,3 +44,9 @@ e.g:
insmod omap_hdq.ko W1_ID=2
inamod w1_bq27000.ko F_ID=2
+The driver also supports 1-wire mode. In this mode, there is no need to
+pass slave ID as parameter. The driver will auto-detect slaves connected
+to the bus using SEARCH_ROM procedure. 1-wire mode can be selected by
+setting "ti,mode" property to "1w" in DT (see
+Documentation/devicetree/bindings/w1/omap-hdq.txt for more details).
+By default driver is in HDQ mode.