[PATCH v2 2/3] mfd: syscon: Add optional clock support
From: Fabrice Gasnier <hidden>
Date: 2018-12-12 08:48:51
Also in:
linux-devicetree, lkml
Subsystem:
multifunction devices (mfd), system configuration (syscon), the rest · Maintainers:
Lee Jones, Arnd Bergmann, Linus Torvalds
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 <redacted> --- drivers/mfd/syscon.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index b6d05cd..a0ba4ff 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 @@ struct syscon { 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:
--
1.9.1
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