[PATCH v10 05/13] slimbus: core: add support to device tree helper

srinivas.kandagatla
2017-12-11T23:45:20Z

From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

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

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/slimbus/core.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index ed53ae6bd1cc..1accb20ed5cd 100644
--- 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);
--
2.15.0