OF helper routine scans the SLIMbus DeviceTree, allocates resources,
and creates slim_devices according to the hierarchy.
Signed-off-by: Sagar Dharia <sdha...@codeaurora.org>
---
Documentation/devicetree/bindings/slimbus/bus.txt | 34 ++++++++++
drivers/slimbus/slimbus.c | 76 +++++++++++++++++++++++
2 files changed, 110 insertions(+)
create mode 100644 Documentation/devicetree/bindings/slimbus/bus.txt
diff --git a/Documentation/devicetree/bindings/slimbus/bus.txt
b/Documentation/devicetree/bindings/slimbus/bus.txt
new file mode 100644
index 0000000..a7a36aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/slimbus/bus.txt
@@ -0,0 +1,34 @@
+SLIM(Serial Low Power Interchip Media Bus) bus
+
+SLIMbus is a 2-wire bus, and is used to communicate with peripheral
+components like audio-codec.
+
+Required property for SLIMbus controller node:
+- compatible - name of SLIMbus controller.
+
+No other properties are required in the SLIMbus controller bus node.
+
+Child nodes:
+
+Every SLIMbus controller node can contain zero or more child nodes
+representing slave devices on the bus. Every SLIMbus slave device is
+uniquely determined by the 6 byte enumeration address.
+
+Required property for SLIMbus child node:
+enumeration-addr - 6 byte enumeration address of the slave
+
+SLIMbus example for Qualcomm's slimbus manager compoent:
+
+ slim@28080000 {
+ compatible = "qcom,slim-msm";
+ reg = <0x28080000 0x2000>,
+ reg-names = "slimbus_physical";
+ interrupts = <0 33 0>;
+ interrupt-names = "slimbus_irq";
+ clocks = <&lcc SLIMBUS_SRC>, <&lcc AUDIO_SLIMBUS_CLK>;
+ clock-names = "iface_clk", "core_clk";
+
+ slim_codec_slave {
+ enumeration-addr = [00 01 60 00 17 02];
+ };
+ };
diff --git a/drivers/slimbus/slimbus.c b/drivers/slimbus/slimbus.c
index 2baf43a..0295a06 100644
--- a/drivers/slimbus/slimbus.c
+++ b/drivers/slimbus/slimbus.c
@@ -19,6 +19,7 @@
#include <linux/idr.h>
#include <linux/pm_runtime.h>
#include <linux/slimbus.h>
+#include <linux/of.h>
static DEFINE_MUTEX(slim_lock);
static DEFINE_IDR(ctrl_idr);
@@ -270,6 +271,80 @@ static LIST_HEAD(board_list);
static LIST_HEAD(slim_ctrl_list);
static DEFINE_MUTEX(board_lock);
+#if IS_ENABLED(CONFIG_OF)
+/* OF helpers for SLIMbus */
+static void of_register_slim_devices(struct slim_controller *ctrl)
+{
+ struct device_node *node;
+ struct slim_boardinfo *temp, *binfo = NULL;
+ int ret, n = 0;
+
+ if (!ctrl->dev.of_node)
+ return;
+
+ for_each_child_of_node(ctrl->dev.of_node, node) {
+ struct property *prop;
+ u8 *ea;
+ struct slim_device *slim;
+ char *name;
+
+ prop = of_find_property(node, "enumeration-addr", NULL);
+ if (!prop || prop->length != 6) {
+ dev_err(&ctrl->dev, "of_slim: invalid E-addr\n");
+ continue;
+ }
+ ea = (u8 *)prop->value;
+ name = kcalloc(SLIMBUS_NAME_SIZE, sizeof(char), GFP_KERNEL);
+ if (!name)
+ goto of_slim_err;
+
+ ret = of_modalias_node(node, name, SLIMBUS_NAME_SIZE);
+ if (ret < 0) {
+ dev_err(&ctrl->dev, "of_slim: modalias fail:%d on %s\n",
+ ret, node->full_name);
+ kfree(name);
+ continue;
+ }
+ slim = kzalloc(sizeof(struct slim_device), GFP_KERNEL);
+ if (!slim) {
+ kfree(name);
+ goto of_slim_err;
+ }
+ slim->e_addr.manf_id = (u16)(ea[5] << 8) | ea[4];
+ slim->e_addr.prod_code = (u16)(ea[3] << 8) | ea[2];
+ slim->e_addr.dev_index = ea[1];
+ slim->e_addr.instance = ea[0];
+
+
+ temp = krealloc(binfo, (n + 1) * sizeof(struct slim_boardinfo),
+ GFP_KERNEL);
+ if (!temp) {
+ kfree(name);
+ kfree(slim);
+ goto of_slim_err;
+ }
+ binfo = temp;
+ slim->dev.of_node = of_node_get(node);
+ slim->name = name;
+ binfo[n].bus_num = ctrl->nr;
+ binfo[n].slim_slave = slim;
+ n++;
+ }
+ slim_register_board_info(binfo, n);
+ return;
+
+of_slim_err:
+ n--;
+ while (n >= 0) {
+ kfree(binfo[n].slim_slave->name);
+ kfree(binfo[n].slim_slave);
+ }
+ kfree(binfo);
+}
+#else
+static void of_register_slim_devices(struct slim_controller *ctrl) { }
+#endif
+
/* If controller is not present, only add to boards list */
static void slim_match_ctrl_to_boardinfo(struct slim_controller *ctrl,
struct slim_boardinfo *bi)
@@ -326,6 +401,7 @@ void slim_ctrl_add_boarddevs(struct slim_controller *ctrl)
{
struct sbi_boardinfo *bi;
+ of_register_slim_devices(ctrl);
mutex_lock(&board_lock);
list_add_tail(&ctrl->list, &slim_ctrl_list);
list_for_each_entry(bi, &board_list, list)
--
1.8.2.1
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