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Subject[PATCH v3] mfd: syscon: Add non-DT support
Date
This patch allow using syscon driver from the platform data, i.e.
possibility using driver on systems without oftree support.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
drivers/mfd/Kconfig | 1 -
drivers/mfd/syscon.c | 76 +++++++++++++++++++++++++++++++++++++++-------------
2 files changed, 57 insertions(+), 20 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 4a7ed5a..3c0abcb 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -28,7 +28,7 @@ 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;

@@ -41,7 +41,7 @@ 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);

@@ -51,19 +51,41 @@ struct regmap *syscon_node_to_regmap(struct device_node *np)
}
EXPORT_SYMBOL_GPL(syscon_node_to_regmap);

+static int syscon_match_id(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)
+ return !strcmp(id->name, (const char *)data);
+
+ return 0;
+}
+
struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
{
struct device_node *syscon_np;
struct regmap *regmap;
+ struct syscon *syscon;
+ struct device *dev;

syscon_np = of_find_compatible_node(NULL, NULL, s);
- if (!syscon_np)
+ if (syscon_np) {
+ regmap = syscon_node_to_regmap(syscon_np);
+ of_node_put(syscon_np);
+
+ return regmap;
+ }
+
+ /* Fallback to search by id_entry.name string */
+ dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
+ syscon_match_id);
+ if (!dev)
return ERR_PTR(-ENODEV);

- regmap = syscon_node_to_regmap(syscon_np);
- of_node_put(syscon_np);
+ syscon = dev_get_drvdata(dev);

- return regmap;
+ return syscon->regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);

@@ -100,37 +122,53 @@ 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) {
+ iounmap(syscon->base);
+ return ret;
+ }
+ } else {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
+
+ if (!devm_request_mem_region(dev, 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)) {
dev_err(dev, "regmap init failed\n");
+ iounmap(syscon->base);
return PTR_ERR(syscon->regmap);
}

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;
}
--
1.7.12.4


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