From e4123095febc94c547c0459db752e7879db79d76 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 21 May 2013 10:48:54 -0300 Subject: [PATCH 044/203] bus: mvebu-mbus: Introduce device tree binding 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 Signed-off-by: Ezequiel Garcia Tested-by: Andrew Lunn Tested-by: Sebastian Hesselbarth --- drivers/bus/mvebu-mbus.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/mbus.h | 1 + 2 files changed, 50 insertions(+) --- a/drivers/bus/mvebu-mbus.c +++ b/drivers/bus/mvebu-mbus.c @@ -900,3 +900,52 @@ int __init mvebu_mbus_init(const char *s 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 --- a/include/linux/mbus.h +++ b/include/linux/mbus.h @@ -74,5 +74,6 @@ int mvebu_mbus_del_window(phys_addr_t ba 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 */