slimbus: Add Device Tree support for SLIMBUS
Slave devices can be added by listing them as child of a SLIMBUS
controller of_node in the Device Tree.
It is required to specify elemental address, and name of the slave
device.
Change-Id: Ie1b2f8fe58988f0237547a84f1bbb14ce4733eff
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index a306357..b8cdc6b 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -81,4 +81,10 @@
help
OpenFirmware SPMI bus accessors
+config OF_SLIMBUS
+ def_tristate SLIMBUS
+ depends on SLIMBUS
+ help
+ OpenFirmware SLIMBUS accessors
+
endmenu # OF
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 2087c5e..bc2b481 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -11,3 +11,4 @@
obj-$(CONFIG_OF_MDIO) += of_mdio.o
obj-$(CONFIG_OF_PCI) += of_pci.o
obj-$(CONFIG_OF_SPMI) += of_spmi.o
+obj-$(CONFIG_OF_SLIMBUS) += of_slimbus.o
diff --git a/drivers/of/of_slimbus.c b/drivers/of/of_slimbus.c
new file mode 100644
index 0000000..512ca73
--- /dev/null
+++ b/drivers/of/of_slimbus.c
@@ -0,0 +1,83 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/* OF helpers for SLIMbus */
+#include <linux/slimbus/slimbus.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_slimbus.h>
+
+int of_register_slim_devices(struct slim_controller *ctrl)
+{
+ struct device_node *node;
+ struct slim_boardinfo *binfo = NULL;
+ int n = 0;
+ int ret = 0;
+
+ if (!ctrl->dev.of_node)
+ return -EINVAL;
+
+ for_each_child_of_node(ctrl->dev.of_node, node) {
+ struct property *prop;
+ struct slim_device *slim;
+ char *name;
+ prop = of_find_property(node, "elemental-addr", NULL);
+ if (!prop || prop->length != 6) {
+ dev_err(&ctrl->dev, "of_slim: invalid E-addr");
+ continue;
+ }
+ name = kzalloc(SLIMBUS_NAME_SIZE, GFP_KERNEL);
+ if (!name) {
+ dev_err(&ctrl->dev, "of_slim: out of memory");
+ ret = -ENOMEM;
+ goto of_slim_err;
+ }
+ if (of_modalias_node(node, name, SLIMBUS_NAME_SIZE) < 0) {
+ dev_err(&ctrl->dev, "of_slim: modalias failure on %s\n",
+ node->full_name);
+ kfree(name);
+ continue;
+ }
+ slim = kzalloc(sizeof(struct slim_device), GFP_KERNEL);
+ if (!slim) {
+ dev_err(&ctrl->dev, "of_slim: out of memory");
+ ret = -ENOMEM;
+ kfree(name);
+ goto of_slim_err;
+ }
+ memcpy(slim->e_addr, prop->value, 6);
+
+ binfo = krealloc(binfo, (n + 1) * sizeof(struct slim_boardinfo),
+ GFP_KERNEL);
+ if (!binfo) {
+ dev_err(&ctrl->dev, "out of memory");
+ kfree(name);
+ kfree(slim);
+ return -ENOMEM;
+ }
+ slim->name = (const char *)name;
+ binfo[n].bus_num = ctrl->nr;
+ binfo[n].slim_slave = slim;
+ n++;
+ }
+ return slim_register_board_info(binfo, n);
+of_slim_err:
+ n--;
+ while (n >= 0) {
+ kfree(binfo[n].slim_slave->name);
+ kfree(binfo[n].slim_slave);
+ }
+ kfree(binfo);
+ return ret;
+}
diff --git a/include/linux/of_slimbus.h b/include/linux/of_slimbus.h
new file mode 100644
index 0000000..8e1dc65
--- /dev/null
+++ b/include/linux/of_slimbus.h
@@ -0,0 +1,34 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/slimbus/slimbus.h>
+#include <linux/of_irq.h>
+
+#ifdef CONFIG_OF_SLIMBUS
+/*
+ * of_slim_register_devices() - Register devices in the SLIMbus Device Tree
+ * @ctrl: slim_controller which devices should be registered to.
+ *
+ * This routine scans the SLIMbus Device Tree, allocating resources and
+ * creating slim_devices according to the SLIMbus Device Tree
+ * hierarchy. Details of this hierarchy can be found in
+ * Documentation/devicetree/bindings/slimbus. This routine is normally
+ * called from the probe routine of the driver registering as a
+ * slim_controller.
+ */
+extern int of_register_slim_devices(struct slim_controller *ctrl);
+#else
+static int of_register_slim_devices(struct slim_controller *ctrl)
+{
+ return 0;
+}
+#endif /* CONFIG_OF_SLIMBUS */