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Date: Mon, 4 Feb 2013 19:00:40 +0400
From: Alexander Shiyan <shc_work@...l.ru>
To: linux-kernel@...r.kernel.org
Cc: Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Dong Aisheng <dong.aisheng@...aro.org>,
Alexander Shiyan <shc_work@...l.ru>
Subject: [PATCH] mfd: syscon: Added support for using platform driver resources
This patch adds support usage platform driver resources, i.e.
possibility works without oftree support. Additionally patch
removes CONFIG_OF dependency and adds helper for accessing
regmap by searching device by its name.
Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
---
drivers/mfd/Kconfig | 1 -
drivers/mfd/syscon.c | 62 +++++++++++++++++++++++++++++++++++-----------
include/linux/mfd/syscon.h | 1 +
3 files changed, 48 insertions(+), 16 deletions(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 47ad4e2..389f5e2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1065,7 +1065,6 @@ 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 3f10591..27d0a08 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -29,7 +29,27 @@ struct syscon {
struct regmap *regmap;
};
-static int syscon_match(struct device *dev, void *data)
+static int syscon_match_name(struct device *dev, void *data)
+{
+ return !strcmp(dev_name(dev), (const char *)data);
+}
+
+struct regmap *syscon_regmap_lookup_by_name(const char *name)
+{
+ struct syscon *syscon;
+ struct device *dev;
+
+ dev = driver_find_device(&syscon_driver.driver, NULL, (void *)name,
+ syscon_match_name);
+ if (!dev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ syscon = dev_get_drvdata(dev);
+
+ return syscon->regmap;
+}
+
+static int syscon_match_of(struct device *dev, void *data)
{
struct syscon *syscon = dev_get_drvdata(dev);
struct device_node *dn = data;
@@ -43,7 +63,7 @@ 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_of);
if (!dev)
return ERR_PTR(-EPROBE_DEFER);
@@ -102,26 +122,38 @@ 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;
+ struct resource *res, res_of;
int ret;
- if (!np)
- return -ENOENT;
-
syscon = devm_kzalloc(dev, sizeof(struct syscon),
GFP_KERNEL);
if (!syscon)
return -ENOMEM;
- syscon->base = of_iomap(np, 0);
- if (!syscon->base)
- return -EADDRNOTAVAIL;
-
- ret = of_address_to_resource(np, 0, &res);
- if (ret)
- return ret;
+ if (IS_ENABLED(CONFIG_OF) && np) {
+ syscon->base = of_iomap(np, 0);
+ if (!syscon->base)
+ return -EADDRNOTAVAIL;
+
+ res = &res_of;
+ ret = of_address_to_resource(np, 0, res);
+ if (ret)
+ return ret;
+ } else {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENXIO;
+
+ if (!request_mem_region(res->start, resource_size(res),
+ dev_name(&pdev->dev)))
+ return -EBUSY;
+
+ syscon->base = ioremap(res->start, resource_size(res));
+ if (!syscon->base)
+ return -EADDRNOTAVAIL;
+ }
- 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);
if (IS_ERR(syscon->regmap)) {
@@ -133,7 +165,7 @@ 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);
+ res->start, res->end);
return 0;
}
diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index 6aeb6b8..e14f7fd 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -15,6 +15,7 @@
#ifndef __LINUX_MFD_SYSCON_H__
#define __LINUX_MFD_SYSCON_H__
+extern struct regmap *syscon_regmap_lookup_by_name(const char *name);
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_phandle(
--
1.7.12.4
--
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