This patch adds the most fundamental device-tree initialization.
We only introduce what's required to be able to probe the mvebu-mbus
driver from the DT. Follow-up patches will extend the device tree binding,
allowing to describe static address decoding windows.
Signed-off-by: Thomas Petazzoni <thomas.petazz...@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.gar...@free-electrons.com>
---
drivers/bus/mvebu-mbus.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/mbus.h | 1 +
2 files changed, 50 insertions(+)
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 1b17954..44a07c4 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -900,3 +900,52 @@ int __init mvebu_mbus_init(const char *soc, phys_addr_t
mbuswins_phys_base,
sdramwins_phys_base,
sdramwins_size);
}
+
+#ifdef CONFIG_OF
+int __init mvebu_mbus_dt_init(void)
+{
+ struct resource mbuswins_res, sdramwins_res;
+ struct device_node *np, *controller;
+ const struct of_device_id *of_id;
+ const __be32 *prop;
+ int ret;
+
+ np = of_find_matching_node(NULL, of_mvebu_mbus_ids);
+ if (!np) {
+ pr_err("could not find a matching SoC family\n");
+ return -ENODEV;
+ }
+
+ of_id = of_match_node(of_mvebu_mbus_ids, np);
+ mbus_state.soc = of_id->data;
+
+ prop = of_get_property(np, "controller", NULL);
+ if (!prop) {
+ pr_err("required 'controller' property missing\n");
+ return -EINVAL;
+ }
+
+ controller = of_find_node_by_phandle(be32_to_cpup(prop));
+ if (!controller) {
+ pr_err("could not find an 'mbus-controller' node\n");
+ return -ENODEV;
+ }
+
+ if (of_address_to_resource(controller, 0, &mbuswins_res)) {
+ pr_err("cannot get MBUS register address\n");
+ return -EINVAL;
+ }
+
+ if (of_address_to_resource(controller, 1, &sdramwins_res)) {
+ pr_err("cannot get SDRAM register address\n");
+ return -EINVAL;
+ }
+
+ ret = mvebu_mbus_common_init(&mbus_state,
+ mbuswins_res.start,
+ resource_size(&mbuswins_res),
+ sdramwins_res.start,
+ resource_size(&sdramwins_res));
+ return ret;
+}
+#endif
diff --git a/include/linux/mbus.h b/include/linux/mbus.h
index 9245b66..eadefd6 100644
--- a/include/linux/mbus.h
+++ b/include/linux/mbus.h
@@ -74,5 +74,6 @@ int mvebu_mbus_del_window(phys_addr_t base, size_t size);
int mvebu_mbus_init(const char *soc, phys_addr_t mbus_phys_base,
size_t mbus_size, phys_addr_t sdram_phys_base,
size_t sdram_size);
+int mvebu_mbus_dt_init(void);
#endif /* __LINUX_MBUS_H */
--
1.8.1.5
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