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Date: Thu, 28 Feb 2013 18:57:14 +0400
From: Alexander Shiyan <shc_work@...l.ru>
To: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
Dong Aisheng <dong.aisheng@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Thierry Reding <thierry.reding@...onic-design.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Stephen Warren <swarren@...dotorg.org>,
Alexander Shiyan <shc_work@...l.ru>
Subject: [PATCH v6 2/2] mfd: syscon: Add non-DT support
This patch allow using syscon driver from the platform data, i.e.
possibility using driver on systems without oftree support.
For search syscon device from the client drivers,
"syscon_regmap_lookup_by_pdevname" function was added.
Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
---
drivers/mfd/Kconfig | 1 -
drivers/mfd/syscon.c | 77 +++++++++++++++++++++++++++-------------------
include/linux/mfd/syscon.h | 1 +
3 files changed, 47 insertions(+), 32 deletions(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 671f5b1..8fdd87e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1070,7 +1070,6 @@ config MFD_STA2X11
config MFD_SYSCON
bool "System Controller Register R/W Based on Regmap"
- depends on OF
select REGMAP_MMIO
help
Select this option to enable accessing system control registers
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 674af14..e5b6be1 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -29,7 +29,7 @@ struct syscon {
struct regmap *regmap;
};
-static int syscon_match(struct device *dev, void *data)
+static int syscon_match_node(struct device *dev, void *data)
{
struct device_node *dn = data;
@@ -42,7 +42,7 @@ struct regmap *syscon_node_to_regmap(struct device_node *np)
struct device *dev;
dev = driver_find_device(&syscon_driver.driver, NULL, np,
- syscon_match);
+ syscon_match_node);
if (!dev)
return ERR_PTR(-EPROBE_DEFER);
@@ -68,6 +68,34 @@ struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
+static int syscon_match_pdevname(struct device *dev, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+
+ if (id)
+ if (!strcmp(id->name, (const char *)data))
+ return 1;
+
+ return !strcmp(dev_name(dev), (const char *)data);
+}
+
+struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
+{
+ struct device *dev;
+ struct syscon *syscon;
+
+ dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
+ syscon_match_pdevname);
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+
+ syscon = dev_get_drvdata(dev);
+
+ return syscon->regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);
+
struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
const char *property)
{
@@ -99,30 +127,24 @@ static struct regmap_config syscon_regmap_config = {
static int syscon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
struct syscon *syscon;
- struct resource res;
- int ret;
-
- if (!np)
- return -ENOENT;
+ struct resource *res;
- syscon = devm_kzalloc(dev, sizeof(struct syscon),
- GFP_KERNEL);
+ syscon = devm_kzalloc(dev, sizeof(struct syscon), GFP_KERNEL);
if (!syscon)
return -ENOMEM;
- syscon->base = of_iomap(np, 0);
- if (!syscon->base)
- return -EADDRNOTAVAIL;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
- ret = of_address_to_resource(np, 0, &res);
- if (ret)
- return ret;
+ syscon->base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!syscon->base)
+ return -ENOMEM;
- syscon_regmap_config.max_register = res.end - res.start - 3;
+ syscon_regmap_config.max_register = res->end - res->start - 3;
syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
- &syscon_regmap_config);
+ &syscon_regmap_config);
if (IS_ERR(syscon->regmap)) {
dev_err(dev, "regmap init failed\n");
return PTR_ERR(syscon->regmap);
@@ -130,22 +152,15 @@ static int syscon_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, syscon);
- dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
- res.start, res.end);
+ dev_info(dev, "regmap 0x%x-0x%x registered\n", res->start, res->end);
return 0;
}
-static int syscon_remove(struct platform_device *pdev)
-{
- struct syscon *syscon;
-
- syscon = platform_get_drvdata(pdev);
- iounmap(syscon->base);
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
+static const struct platform_device_id syscon_ids[] = {
+ { "syscon", },
+ { }
+};
static struct platform_driver syscon_driver = {
.driver = {
@@ -154,7 +169,7 @@ static struct platform_driver syscon_driver = {
.of_match_table = of_syscon_match,
},
.probe = syscon_probe,
- .remove = syscon_remove,
+ .id_table = syscon_ids,
};
static int __init syscon_init(void)
diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index 6aeb6b8..5c9ee6e 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -17,6 +17,7 @@
extern struct regmap *syscon_node_to_regmap(struct device_node *np);
extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
+extern struct regmap *syscon_regmap_lookup_by_pdevname(const char *s);
extern struct regmap *syscon_regmap_lookup_by_phandle(
struct device_node *np,
const char *property);
--
1.7.12.4
--
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