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Subject[PATCH v4 1/2] mfd: syscon: Support physical regmap bus
Date
Some platforms such as Spreadtrum platform, define a special method to
update bits of the registers instead of reading and writing, which means
we should use a physical regmap bus to define the reg_update_bits()
operation instead of the MMIO regmap bus.

Thus add a a __weak function for the syscon driver to allow to register
a physical regmap bus to support this new requirement.

Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
---
drivers/mfd/syscon.c | 9 ++++++++-
include/linux/mfd/syscon.h | 11 +++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 3a97816d0cba..dc92f3177ceb 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -40,6 +40,13 @@ static const struct regmap_config syscon_regmap_config = {
.reg_stride = 4,
};

+struct regmap * __weak syscon_regmap_init(struct device_node *np,
+ void __iomem *base,
+ struct regmap_config *syscon_config)
+{
+ return regmap_init_mmio(NULL, base, syscon_config);
+}
+
static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
{
struct clk *clk;
@@ -106,7 +113,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
syscon_config.val_bits = reg_io_width * 8;
syscon_config.max_register = resource_size(&res) - reg_io_width;

- regmap = regmap_init_mmio(NULL, base, &syscon_config);
+ regmap = syscon_regmap_init(np, base, &syscon_config);
if (IS_ERR(regmap)) {
pr_err("regmap init failed\n");
ret = PTR_ERR(regmap);
diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index 7f20e9b502a5..85088e44fe7c 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -13,6 +13,7 @@

#include <linux/err.h>
#include <linux/errno.h>
+#include <linux/regmap.h>

struct device_node;

@@ -28,6 +29,9 @@ extern struct regmap *syscon_regmap_lookup_by_phandle_args(
const char *property,
int arg_count,
unsigned int *out_args);
+extern struct regmap *syscon_regmap_init(struct device_node *np,
+ void __iomem *base,
+ struct regmap_config *syscon_config);
#else
static inline struct regmap *device_node_to_regmap(struct device_node *np)
{
@@ -59,6 +63,13 @@ static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
{
return ERR_PTR(-ENOTSUPP);
}
+
+static inline struct regmap *syscon_regmap_init(struct device_node *np,
+ void __iomem *base,
+ struct regmap_config *syscon_config)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
#endif

#endif /* __LINUX_MFD_SYSCON_H__ */
--
2.17.1
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