i2c/of: Automatically populate i2c mux busses from device tree data.

For 'normal' i2c bus drivers, we can call of_i2c_register_devices()
and have the device tree framework automatically populate the bus with
the devices specified in the device tree.

This patch adds a common code to the i2c mux framework to have the mux
sub-busses be populated by the of_i2c_register_devices() too.  If the
mux device has an of_node, we populate the sub-bus' of_node so that
the subsequent call to of_i2c_register_devices() will find the
corresponding devices.

It seemed better to put this logic in i2c_add_mux_adapter() rather
than the individual mux drivers, as they will all probably want to do
the same thing.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>

[wsa: removed superfluous ret-variable and fixed a typo in a comment]
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

2 files changed, 83 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/mux.txt b/Documentation/devicetree/bindings/i2c/mux.txt
new file mode 100644
index 000000000000..af84cce5cd7b
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/mux.txt
@@ -0,0 +1,60 @@
+Common i2c bus multiplexer/switch properties.
+
+An i2c bus multiplexer/switch will have several child busses that are
+numbered uniquely in a device dependent manner.  The nodes for an i2c bus
+multiplexer/switch will have one child node for each child
+bus.
+
+Required properties:
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Required properties for child nodes:
+- #address-cells = <1>;
+- #size-cells = <0>;
+- reg : The sub-bus number.
+
+Optional properties for child nodes:
+- Other properties specific to the multiplexer/switch hardware.
+- Child nodes conforming to i2c bus binding
+
+
+Example :
+
+        /*
+           An NXP pca9548 8 channel I2C multiplexer at address 0x70
+           with two NXP pca8574 GPIO expanders attached, one each to
+           ports 3 and 4.
+         */
+
+        mux@70 {
+                compatible = "nxp,pca9548";
+                reg = <0x70>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                i2c@3 {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        reg = <3>;
+
+                        gpio1: gpio@38 {
+                                compatible = "nxp,pca8574";
+                                reg = <0x38>;
+                                #gpio-cells = <2>;
+                                gpio-controller;
+                        };
+                };
+                i2c@4 {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        reg = <4>;
+
+                        gpio2: gpio@38 {
+                                compatible = "nxp,pca8574";
+                                reg = <0x38>;
+                                #gpio-cells = <2>;
+                                gpio-controller;
+                        };
+                };
+        };
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 26ab31dd742b..1038c381aea5 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -24,6 +24,8 @@
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
+#include <linux/of.h>
+#include <linux/of_i2c.h>
 
 /* multiplexer per channel data */
 struct i2c_mux_priv {
@@ -125,6 +127,25 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
         priv->adap.algo_data = priv;
         priv->adap.dev.parent = &parent->dev;
 
+        /*
+         * Try to populate the mux adapter's of_node, expands to
+         * nothing if !CONFIG_OF.
+         */
+        if (mux_dev->of_node) {
+                struct device_node *child;
+                u32 reg;
+
+                for_each_child_of_node(mux_dev->of_node, child) {
+                        ret = of_property_read_u32(child, "reg", &reg);
+                        if (ret)
+                                continue;
+                        if (chan_id == reg) {
+                                priv->adap.dev.of_node = child;
+                                break;
+                        }
+                }
+        }
+
         if (force_nr) {
                 priv->adap.nr = force_nr;
                 ret = i2c_add_numbered_adapter(&priv->adap);
@@ -142,6 +163,8 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
         dev_info(&parent->dev, "Added multiplexed i2c bus %d\n",
                  i2c_adapter_id(&priv->adap));
 
+        of_i2c_register_devices(&priv->adap);
+
         return &priv->adap;
 }
 EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);