mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
97a2f40e38
In case of error, the function of_find_matching_node() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.
Link: https://lore.kernel.org/r/20200525091634.8274-1-linus.walleij@linaro.org
Fixes: ccea5e8a59 ("bus: Add driver for Integrator/AP logic modules")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20200520032150.165388-1-weiyongjun1@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* ARM Integrator Logical Module bus driver
|
|
* Copyright (C) 2020 Linaro Ltd.
|
|
* Author: Linus Walleij <linus.walleij@linaro.org>
|
|
*
|
|
* See the device tree bindings for this block for more details on the
|
|
* hardware.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/* All information about the connected logic modules are in here */
|
|
#define INTEGRATOR_SC_DEC_OFFSET 0x10
|
|
|
|
/* Base address for the expansion modules */
|
|
#define INTEGRATOR_AP_EXP_BASE 0xc0000000
|
|
#define INTEGRATOR_AP_EXP_STRIDE 0x10000000
|
|
|
|
static int integrator_lm_populate(int num, struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct device_node *child;
|
|
u32 base;
|
|
int ret;
|
|
|
|
base = INTEGRATOR_AP_EXP_BASE + (num * INTEGRATOR_AP_EXP_STRIDE);
|
|
|
|
/* Walk over the child nodes and see what chipselects we use */
|
|
for_each_available_child_of_node(np, child) {
|
|
struct resource res;
|
|
|
|
ret = of_address_to_resource(child, 0, &res);
|
|
if (ret) {
|
|
dev_info(dev, "no valid address on child\n");
|
|
continue;
|
|
}
|
|
|
|
/* First populate the syscon then any devices */
|
|
if (res.start == base) {
|
|
dev_info(dev, "populate module @0x%08x from DT\n",
|
|
base);
|
|
ret = of_platform_default_populate(child, NULL, dev);
|
|
if (ret) {
|
|
dev_err(dev, "failed to populate module\n");
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id integrator_ap_syscon_match[] = {
|
|
{ .compatible = "arm,integrator-ap-syscon"},
|
|
{ },
|
|
};
|
|
|
|
static int integrator_ap_lm_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *syscon;
|
|
static struct regmap *map;
|
|
u32 val;
|
|
int ret;
|
|
int i;
|
|
|
|
/* Look up the system controller */
|
|
syscon = of_find_matching_node(NULL, integrator_ap_syscon_match);
|
|
if (!syscon) {
|
|
dev_err(dev,
|
|
"could not find Integrator/AP system controller\n");
|
|
return -ENODEV;
|
|
}
|
|
map = syscon_node_to_regmap(syscon);
|
|
if (IS_ERR(map)) {
|
|
dev_err(dev,
|
|
"could not find Integrator/AP system controller\n");
|
|
return PTR_ERR(map);
|
|
}
|
|
|
|
ret = regmap_read(map, INTEGRATOR_SC_DEC_OFFSET, &val);
|
|
if (ret) {
|
|
dev_err(dev, "could not read from Integrator/AP syscon\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Loop over the connected modules */
|
|
for (i = 0; i < 4; i++) {
|
|
if (!(val & BIT(4 + i)))
|
|
continue;
|
|
|
|
dev_info(dev, "detected module in slot %d\n", i);
|
|
ret = integrator_lm_populate(i, dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id integrator_ap_lm_match[] = {
|
|
{ .compatible = "arm,integrator-ap-lm"},
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver integrator_ap_lm_driver = {
|
|
.probe = integrator_ap_lm_probe,
|
|
.driver = {
|
|
.name = "integratorap-lm",
|
|
.of_match_table = integrator_ap_lm_match,
|
|
},
|
|
};
|
|
module_platform_driver(integrator_ap_lm_driver);
|
|
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
|
|
MODULE_DESCRIPTION("Integrator AP Logical Module driver");
|
|
MODULE_LICENSE("GPL v2");
|