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slimbus: Add Device Tree support for SLIMBUS

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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>
Signed-off-by: David Brown <davidb@codeaurora.org>
This commit is contained in:
Sagar Dharia 2012-03-21 15:29:04 -06:00 committed by Stephen Boyd
parent 9a48a536f5
commit 648766e533
4 changed files with 124 additions and 0 deletions
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6
drivers/of/Kconfig
View file

@ -101,4 +101,10 @@ config OF_MTD
depends on MTD
def_bool y
config OF_SLIMBUS
def_tristate SLIMBUS
depends on SLIMBUS
help
OpenFirmware SLIMBUS accessors
endmenu # OF

1
drivers/of/Makefile
View file

@ -14,3 +14,4 @@ obj-$(CONFIG_OF_PCI) += of_pci.o
obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
obj-$(CONFIG_OF_SPMI) += of_spmi.o
obj-$(CONFIG_OF_MTD) += of_mtd.o
obj-$(CONFIG_OF_SLIMBUS) += of_slimbus.o

83
drivers/of/of_slimbus.c Normal file
View file

@ -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;
}

34
include/linux/of_slimbus.h Normal file
View file

@ -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 */