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Message-Id: <1433923073-907-3-git-send-email-lee.jones@linaro.org>
Date: Wed, 10 Jun 2015 08:57:50 +0100
From: Lee Jones <lee.jones@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: kernel@...inux.com, broonie@...nel.org, lgirdwood@...il.com,
Lee Jones <lee.jones@...aro.org>
Subject: [REBASED 2/5] regulator: pwm-regulator: Separate voltage-table initialisation
Take this out of the main .probe() routine in order to facilitate the
introduction of different ways to obtain 'duty cycle' information.
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
drivers/mfd/mfd-child.c | 47 ++++++++++++++++++++++++
drivers/regulator/pwm-regulator.c | 77 +++++++++++++++++++++++----------------
2 files changed, 92 insertions(+), 32 deletions(-)
create mode 100644 drivers/mfd/mfd-child.c
diff --git a/drivers/mfd/mfd-child.c b/drivers/mfd/mfd-child.c
new file mode 100644
index 0000000..f233add
--- /dev/null
+++ b/drivers/mfd/mfd-child.c
@@ -0,0 +1,47 @@
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+
+static int simple_mfd_child_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void __iomem *base;
+ int irq;
+
+ printk("LEE: %s %s()[%d]: Enter\n", __FILE__, __func__, __LINE__);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev_err(&pdev->dev, "Phys: %x: %x\n", res->start, resource_size(res));
+
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ dev_err(&pdev->dev, "Virt: %p\n", base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "failed to get IRQ: %d\n", irq);
+ return irq;
+ }
+
+ dev_err(&pdev->dev, "IRQ: %d\n", irq);
+
+ return 0;
+}
+
+static const struct of_device_id simple_mfd_child_of_match[] = {
+ { .compatible = "simple-mfd-child" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, simple_mfd_child_of_match);
+
+static struct platform_driver simple_mfd_child_driver = {
+ .probe = simple_mfd_child_probe,
+ .driver = {
+ .name = "simple-mfd-child",
+ .of_match_table = of_match_ptr(simple_mfd_child_of_match),
+ },
+};
+module_platform_driver(simple_mfd_child_driver);
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index ffa9612..25560fc 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -78,8 +78,7 @@ static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
return drvdata->duty_cycle_table[selector].uV;
}
-
-static struct regulator_ops pwm_regulator_voltage_ops = {
+static struct regulator_ops pwm_regulator_voltage_table_ops = {
.set_voltage_sel = pwm_regulator_set_voltage_sel,
.get_voltage_sel = pwm_regulator_get_voltage_sel,
.list_voltage = pwm_regulator_list_voltage,
@@ -88,20 +87,55 @@ static struct regulator_ops pwm_regulator_voltage_ops = {
static struct regulator_desc pwm_regulator_desc = {
.name = "pwm-regulator",
- .ops = &pwm_regulator_voltage_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.supply_name = "pwm",
};
+static int pwm_regulator_init_table(struct platform_device *pdev,
+ struct pwm_regulator_data *drvdata)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct pwm_voltages *duty_cycle_table;
+ int length;
+ int ret;
+
+ of_find_property(np, "voltage-table", &length);
+
+ if ((length < sizeof(*duty_cycle_table)) ||
+ (length % sizeof(*duty_cycle_table))) {
+ dev_err(&pdev->dev,
+ "voltage-table length(%d) is invalid\n",
+ length);
+ return -EINVAL;
+ }
+
+ duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
+ if (!duty_cycle_table)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, "voltage-table",
+ (u32 *)duty_cycle_table,
+ length / sizeof(u32));
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to read voltage-table\n");
+ return ret;
+ }
+
+ drvdata->duty_cycle_table = duty_cycle_table;
+ pwm_regulator_desc.ops = &pwm_regulator_voltage_table_ops;
+ pwm_regulator_desc.n_voltages = length / sizeof(*duty_cycle_table);
+
+ return 0;
+}
+
static int pwm_regulator_probe(struct platform_device *pdev)
{
struct pwm_regulator_data *drvdata;
- struct property *prop;
struct regulator_dev *regulator;
struct regulator_config config = { };
struct device_node *np = pdev->dev.of_node;
- int length, ret;
+ int ret;
if (!np) {
dev_err(&pdev->dev, "Device Tree node missing\n");
@@ -112,36 +146,15 @@ static int pwm_regulator_probe(struct platform_device *pdev)
if (!drvdata)
return -ENOMEM;
- /* determine the number of voltage-table */
- prop = of_find_property(np, "voltage-table", &length);
- if (!prop) {
- dev_err(&pdev->dev, "No voltage-table\n");
- return -EINVAL;
- }
-
- if ((length < sizeof(*drvdata->duty_cycle_table)) ||
- (length % sizeof(*drvdata->duty_cycle_table))) {
- dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
- length);
+ if (of_find_property(np, "voltage-table", NULL)) {
+ ret = pwm_regulator_init_table(pdev, drvdata);
+ if (ret)
+ return ret;
+ } else {
+ dev_err(&pdev->dev, "No \"voltage-table\" supplied\n");
return -EINVAL;
}
- pwm_regulator_desc.n_voltages = length / sizeof(*drvdata->duty_cycle_table);
-
- drvdata->duty_cycle_table = devm_kzalloc(&pdev->dev,
- length, GFP_KERNEL);
- if (!drvdata->duty_cycle_table)
- return -ENOMEM;
-
- /* read voltage table from DT property */
- ret = of_property_read_u32_array(np, "voltage-table",
- (u32 *)drvdata->duty_cycle_table,
- length / sizeof(u32));
- if (ret < 0) {
- dev_err(&pdev->dev, "read voltage-table failed\n");
- return ret;
- }
-
config.init_data = of_get_regulator_init_data(&pdev->dev, np,
&pwm_regulator_desc);
if (!config.init_data)
--
1.9.1
--
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