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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>
This commit is contained in:
Fabrice Gasnier 2018-12-12 09:48:14 +01:00 committed by Lee Jones
parent c6ba08819b
commit a00406b71c
1 changed files with 19 additions and 0 deletions
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19
drivers/mfd/syscon.c
View File

@ -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: