84 lines
2.6 KiB
Diff
84 lines
2.6 KiB
Diff
From e4123095febc94c547c0459db752e7879db79d76 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Date: Tue, 21 May 2013 10:48:54 -0300
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Subject: [PATCH 044/203] bus: mvebu-mbus: Introduce device tree binding
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This patch adds the most fundamental device-tree initialization.
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We only introduce what's required to be able to probe the mvebu-mbus
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driver from the DT. Follow-up patches will extend the device tree binding,
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allowing to describe static address decoding windows.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Tested-by: Andrew Lunn <andrew@lunn.ch>
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Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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---
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drivers/bus/mvebu-mbus.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
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include/linux/mbus.h | 1 +
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2 files changed, 50 insertions(+)
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--- a/drivers/bus/mvebu-mbus.c
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+++ b/drivers/bus/mvebu-mbus.c
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@@ -900,3 +900,52 @@ int __init mvebu_mbus_init(const char *s
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sdramwins_phys_base,
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sdramwins_size);
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}
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+
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+#ifdef CONFIG_OF
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+int __init mvebu_mbus_dt_init(void)
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+{
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+ struct resource mbuswins_res, sdramwins_res;
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+ struct device_node *np, *controller;
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+ const struct of_device_id *of_id;
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+ const __be32 *prop;
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+ int ret;
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+
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+ np = of_find_matching_node(NULL, of_mvebu_mbus_ids);
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+ if (!np) {
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+ pr_err("could not find a matching SoC family\n");
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+ return -ENODEV;
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+ }
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+
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+ of_id = of_match_node(of_mvebu_mbus_ids, np);
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+ mbus_state.soc = of_id->data;
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+
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+ prop = of_get_property(np, "controller", NULL);
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+ if (!prop) {
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+ pr_err("required 'controller' property missing\n");
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+ return -EINVAL;
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+ }
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+
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+ controller = of_find_node_by_phandle(be32_to_cpup(prop));
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+ if (!controller) {
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+ pr_err("could not find an 'mbus-controller' node\n");
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+ return -ENODEV;
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+ }
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+
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+ if (of_address_to_resource(controller, 0, &mbuswins_res)) {
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+ pr_err("cannot get MBUS register address\n");
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+ return -EINVAL;
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+ }
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+
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+ if (of_address_to_resource(controller, 1, &sdramwins_res)) {
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+ pr_err("cannot get SDRAM register address\n");
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+ return -EINVAL;
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+ }
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+
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+ ret = mvebu_mbus_common_init(&mbus_state,
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+ mbuswins_res.start,
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+ resource_size(&mbuswins_res),
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+ sdramwins_res.start,
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+ resource_size(&sdramwins_res));
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+ return ret;
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+}
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+#endif
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--- a/include/linux/mbus.h
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+++ b/include/linux/mbus.h
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@@ -74,5 +74,6 @@ int mvebu_mbus_del_window(phys_addr_t ba
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int mvebu_mbus_init(const char *soc, phys_addr_t mbus_phys_base,
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size_t mbus_size, phys_addr_t sdram_phys_base,
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size_t sdram_size);
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+int mvebu_mbus_dt_init(void);
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#endif /* __LINUX_MBUS_H */
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