slimbus: core: add support to device tree helper

This patch adds support to parse slim devices from device tree.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviwed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index ed53ae6..1accb20 100644 (file)
--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -8,6 +8,7 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/idr.h>
+#include <linux/of.h>
 #include <linux/slimbus.h>
 #include "slimbus.h"
 
@@ -113,6 +114,9 @@ static int slim_add_device(struct slim_controller *ctrl,
        sbdev->dev.driver = NULL;
        sbdev->ctrl = ctrl;
 
+       if (node)
+               sbdev->dev.of_node = of_node_get(node);
+
        dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
                                  sbdev->e_addr.manf_id,
                                  sbdev->e_addr.prod_code,
@@ -143,6 +147,50 @@ static struct slim_device *slim_alloc_device(struct slim_controller *ctrl,
        return sbdev;
 }
 
+static void of_register_slim_devices(struct slim_controller *ctrl)
+{
+       struct device *dev = ctrl->dev;
+       struct device_node *node;
+
+       if (!ctrl->dev->of_node)
+               return;
+
+       for_each_child_of_node(ctrl->dev->of_node, node) {
+               struct slim_device *sbdev;
+               struct slim_eaddr e_addr;
+               const char *compat = NULL;
+               int reg[2], ret;
+               int manf_id, prod_code;
+
+               compat = of_get_property(node, "compatible", NULL);
+               if (!compat)
+                       continue;
+
+               ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
+               if (ret != 2) {
+                       dev_err(dev, "Manf ID & Product code not found %s\n",
+                               compat);
+                       continue;
+               }
+
+               ret = of_property_read_u32_array(node, "reg", reg, 2);
+               if (ret) {
+                       dev_err(dev, "Device and Instance id not found:%d\n",
+                               ret);
+                       continue;
+               }
+
+               e_addr.dev_index = reg[0];
+               e_addr.instance = reg[1];
+               e_addr.manf_id = manf_id;
+               e_addr.prod_code = prod_code;
+
+               sbdev = slim_alloc_device(ctrl, &e_addr, node);
+               if (!sbdev)
+                       continue;
+       }
+}
+
 /*
  * slim_register_controller() - Controller bring-up and registration.
  *
@@ -174,6 +222,8 @@ int slim_register_controller(struct slim_controller *ctrl)
        dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
                ctrl->name, ctrl->dev);
 
+       of_register_slim_devices(ctrl);
+
        return 0;
 }
 EXPORT_SYMBOL_GPL(slim_register_controller);