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authorOrson Zhai <orson.zhai@unisoc.com>2020-01-21 10:09:38 +0300
committerLee Jones <lee.jones@linaro.org>2020-01-24 10:33:59 +0300
commit6a24f567af4accef6d73b0be407227c537b94a1f (patch)
treef68c8686c51429896ba7822ac19a6d229802be5f /drivers/mfd
parent2f3dc25c0118de03a00ddc88b61f7216854f534d (diff)
downloadlinux-6a24f567af4accef6d73b0be407227c537b94a1f.tar.xz
mfd: syscon: Add arguments support for syscon reference
There are a lot of similar global registers being used across multiple SoCs from Unisoc. But most of these registers are assigned with different offset for different SoCs. It is hard to handle all of them in an all-in-one kernel image. Add a helper function to get regmap with arguments where we could put some extra information such as the offset value. Signed-off-by: Orson Zhai <orson.zhai@unisoc.com> Tested-by: Baolin Wang <baolin.wang@unisoc.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/syscon.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 13626bb2d432..3a97816d0cba 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -224,6 +224,35 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
+struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
+ const char *property,
+ int arg_count,
+ unsigned int *out_args)
+{
+ struct device_node *syscon_np;
+ struct of_phandle_args args;
+ struct regmap *regmap;
+ unsigned int index;
+ int rc;
+
+ rc = of_parse_phandle_with_fixed_args(np, property, arg_count,
+ 0, &args);
+ if (rc)
+ return ERR_PTR(rc);
+
+ syscon_np = args.np;
+ if (!syscon_np)
+ return ERR_PTR(-ENODEV);
+
+ regmap = syscon_node_to_regmap(syscon_np);
+ for (index = 0; index < arg_count; index++)
+ out_args[index] = args.args[index];
+ of_node_put(syscon_np);
+
+ return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);
+
static int syscon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;