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Subject[PATCH 1/5] mfd: arizona: Add device tree helper functions
Date
Factor out reading of specific device tree bindings into seperate
functions in preperation for adding more of them. Whilst we are at is
fixup a couple of small issues in the existing binding documentation.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
Documentation/devicetree/bindings/mfd/arizona.txt | 12 +-
drivers/mfd/arizona-core.c | 121 +++++++++++++++------
2 files changed, 95 insertions(+), 38 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/arizona.txt b/Documentation/devicetree/bindings/mfd/arizona.txt
index 0e295c9..e2cecfc 100644
--- a/Documentation/devicetree/bindings/mfd/arizona.txt
+++ b/Documentation/devicetree/bindings/mfd/arizona.txt
@@ -25,7 +25,7 @@ Required properties:
- #gpio-cells : Must be 2. The first cell is the pin number and the
second cell is used to specify optional parameters (currently unused).

- - AVDD1-supply, DBVDD1-supply, DBVDD2-supply, DBVDD3-supply, CPVDD-supply,
+ - AVDD-supply, DBVDD1-supply, DBVDD2-supply, DBVDD3-supply, CPVDD-supply,
SPKVDDL-supply, SPKVDDR-supply : power supplies for the device, as covered
in Documentation/devicetree/bindings/regulator/regulator.txt

@@ -53,10 +53,10 @@ codec: wm5102@1a {
#gpio-cells = <2>;

wlf,gpio-defaults = <
- 0x00000000, /* AIF1TXLRCLK */
- 0xffffffff,
- 0xffffffff,
- 0xffffffff,
- 0xffffffff,
+ 0x00000000 /* AIF1TXLRCLK */
+ 0xffffffff
+ 0xffffffff
+ 0xffffffff
+ 0xffffffff
>;
};
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 5ac3aa4..986abc5 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -512,42 +512,99 @@ int arizona_of_get_type(struct device *dev)
}
EXPORT_SYMBOL_GPL(arizona_of_get_type);

-static int arizona_of_get_core_pdata(struct arizona *arizona)
+static int arizona_of_get_named_gpio(struct arizona *arizona,
+ const char *prop, bool mandatory,
+ int *gpio)
{
- int ret, i;
+ int ret;

- arizona->pdata.reset = of_get_named_gpio(arizona->dev->of_node,
- "wlf,reset", 0);
- if (arizona->pdata.reset < 0)
- arizona->pdata.reset = 0;
-
- arizona->pdata.ldoena = of_get_named_gpio(arizona->dev->of_node,
- "wlf,ldoena", 0);
- if (arizona->pdata.ldoena < 0)
- arizona->pdata.ldoena = 0;
-
- ret = of_property_read_u32_array(arizona->dev->of_node,
- "wlf,gpio-defaults",
- arizona->pdata.gpio_defaults,
- ARRAY_SIZE(arizona->pdata.gpio_defaults));
- if (ret >= 0) {
- /*
- * All values are literal except out of range values
- * which are chip default, translate into platform
- * data which uses 0 as chip default and out of range
- * as zero.
- */
- for (i = 0; i < ARRAY_SIZE(arizona->pdata.gpio_defaults); i++) {
- if (arizona->pdata.gpio_defaults[i] > 0xffff)
- arizona->pdata.gpio_defaults[i] = 0;
- if (arizona->pdata.gpio_defaults[i] == 0)
- arizona->pdata.gpio_defaults[i] = 0x10000;
- }
- } else {
- dev_err(arizona->dev, "Failed to parse GPIO defaults: %d\n",
- ret);
+ ret = of_get_named_gpio(arizona->dev->of_node, prop, 0);
+ *gpio = ret;
+ if (ret >= 0)
+ return ret;
+
+ *gpio = 0;
+
+ if (mandatory)
+ dev_err(arizona->dev,
+ "Mandatory DT gpio %s missing/malformed: %d\n",
+ prop, ret);
+
+ return ret;
+}
+
+static int arizona_of_read_u32_array(struct arizona *arizona,
+ const char *prop, bool mandatory,
+ u32 *data, size_t num)
+{
+ int ret;
+
+ ret = of_property_read_u32_array(arizona->dev->of_node, prop,
+ data, num);
+
+ if (ret >= 0)
+ return 0;
+
+ switch (ret) {
+ case -EINVAL:
+ if (mandatory)
+ dev_err(arizona->dev,
+ "Mandatory DT property %s is missing\n",
+ prop);
+ break;
+ default:
+ dev_err(arizona->dev,
+ "DT property %s is malformed: %d\n",
+ prop, ret);
}

+ return ret;
+}
+
+static int arizona_of_read_u32(struct arizona *arizona,
+ const char* prop, bool mandatory,
+ u32 *data)
+{
+ return arizona_of_read_u32_array(arizona, prop, mandatory, data, 1);
+}
+
+static int arizona_of_get_gpio_defaults(struct arizona *arizona,
+ const char *prop)
+{
+ struct arizona_pdata *pdata = &arizona->pdata;
+ int i, ret;
+
+ ret = arizona_of_read_u32_array(arizona, prop, false,
+ pdata->gpio_defaults,
+ ARRAY_SIZE(pdata->gpio_defaults));
+ if (ret < 0)
+ return ret;
+
+ /*
+ * All values are literal except out of range values
+ * which are chip default, translate into platform
+ * data which uses 0 as chip default and out of range
+ * as zero.
+ */
+ for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
+ if (pdata->gpio_defaults[i] > 0xffff)
+ pdata->gpio_defaults[i] = 0;
+ if (pdata->gpio_defaults[i] == 0)
+ pdata->gpio_defaults[i] = 0x10000;
+ }
+
+ return ret;
+}
+
+static int arizona_of_get_core_pdata(struct arizona *arizona)
+{
+ struct arizona_pdata *pdata = &arizona->pdata;
+
+ arizona_of_get_named_gpio(arizona, "wlf,reset", true, &pdata->reset);
+ arizona_of_get_named_gpio(arizona, "wlf,ldoena", true, &pdata->ldoena);
+
+ arizona_of_get_gpio_defaults(arizona, "wlf,gpio-defaults");
+
return 0;
}

--
1.7.2.5


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