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Commit 6839cfa8 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Jason Cooper
Browse files

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: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: default avatarAndrew Lunn <andrew@lunn.ch>
Tested-by: default avatarSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 6bd6b3cb

drivers/bus/mvebu-mbus.c

+49 −0
Original line number Diff line number Diff line
@@ -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

include/linux/mbus.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */