diff options
| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2018-12-12 09:48:14 +0100 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2019-05-14 09:13:25 +0200 |
| commit | a00406b71c5f08f2bd8171bc43331f0726f9bdae (patch) | |
| tree | d629d2417a3c575f363afa06dfbeb71b1e3e7e9d /drivers/mfd | |
| parent | dt-bindings: stm32: syscon: Add clock support (diff) | |
| download | linux-a00406b71c5f08f2bd8171bc43331f0726f9bdae.tar.xz linux-a00406b71c5f08f2bd8171bc43331f0726f9bdae.zip | |
mfd: syscon: Add optional clock support
Some system control registers need to be clocked, so the registers can
be accessed. Add an optional clock and attach it to regmap.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-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.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c index 0ecdffb3d967..f6922a0f8058 100644 --- a/drivers/mfd/syscon.c +++ b/drivers/mfd/syscon.c @@ -12,6 +12,7 @@ * (at your option) any later version. */ +#include <linux/clk.h> #include <linux/err.h> #include <linux/hwspinlock.h> #include <linux/io.h> @@ -45,6 +46,7 @@ static const struct regmap_config syscon_regmap_config = { static struct syscon *of_syscon_register(struct device_node *np) { + struct clk *clk; struct syscon *syscon; struct regmap *regmap; void __iomem *base; @@ -119,6 +121,18 @@ static struct syscon *of_syscon_register(struct device_node *np) goto err_regmap; } + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + /* clock is optional */ + if (ret != -ENOENT) + goto err_clk; + } else { + ret = regmap_mmio_attach_clk(regmap, clk); + if (ret) + goto err_attach; + } + syscon->regmap = regmap; syscon->np = np; @@ -128,6 +142,11 @@ static struct syscon *of_syscon_register(struct device_node *np) return syscon; +err_attach: + if (!IS_ERR(clk)) + clk_put(clk); +err_clk: + regmap_exit(regmap); err_regmap: iounmap(base); err_map: |