Re: [PATCH 1/7] mfd: max8925: add irqdomain for dt

From: Qing Xu
Date: Tue Nov 27 2012 - 02:42:47 EST

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On 11/23/2012 05:05 PM, Haojian Zhuang wrote:

On Tue, Nov 6, 2012 at 3:37 PM, Qing Xu <qingx@xxxxxxxxxxx> wrote:
From: Qing Xu <qingx@xxxxxxxxxxx>

Add irqdomains for max8925's main irq, and touch irq.
Wrap irq register operations into irqdomain's map func.
it is necessary for dt support.
Also, add dt support for max8925 driver.

Signed-off-by: Qing Xu <qingx@xxxxxxxxxxx>
---
drivers/mfd/max8925-core.c | 87 ++++++++++++++++++++++++++++---------------
drivers/mfd/max8925-i2c.c | 32 +++++++++++++++-
include/linux/mfd/max8925.h | 12 ++++-
3 files changed, 96 insertions(+), 35 deletions(-)

diff --git a/drivers/mfd/max8925-core.c b/drivers/mfd/max8925-core.c
index 1e0ab0a..dcc218a 100644
--- a/drivers/mfd/max8925-core.c
+++ b/drivers/mfd/max8925-core.c
@@ -14,10 +14,14 @@
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8925.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>

static struct resource bk_resources[] __devinitdata = {
{ 0x84, 0x84, "mode control", IORESOURCE_REG, },
@@ -639,17 +643,34 @@ static struct irq_chip max8925_irq_chip = {
.irq_disable = max8925_irq_disable,
};

+static int max8925_irq_domain_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_data(virq, d->host_data);
+ irq_set_chip_and_handler(virq, &max8925_irq_chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(virq, IRQF_VALID);
+#else
+ irq_set_noprobe(virq);
+#endif
+ return 0;
+}
+
+static struct irq_domain_ops max8925_irq_domain_ops = {
+ .map = max8925_irq_domain_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+
static int max8925_irq_init(struct max8925_chip *chip, int irq,
struct max8925_platform_data *pdata)
{
unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
- int i, ret;
- int __irq;
+ int ret;
+ int tsc_irq;
+ struct device_node *node = chip->dev->of_node;

- if (!pdata || !pdata->irq_base) {
- dev_warn(chip->dev, "No interrupt support on IRQ base\n");
- return -EINVAL;
- }
/* clear all interrupts */
max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
@@ -667,45 +688,51 @@ static int max8925_irq_init(struct max8925_chip *chip, int irq,
max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);

mutex_init(&chip->irq_lock);
- chip->core_irq = irq;
- chip->irq_base = pdata->irq_base;

- /* register with genirq */
- for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
- __irq = i + chip->irq_base;
- irq_set_chip_data(__irq, chip);
- irq_set_chip_and_handler(__irq, &max8925_irq_chip,
- handle_edge_irq);
- irq_set_nested_thread(__irq, 1);
-#ifdef CONFIG_ARM
- set_irq_flags(__irq, IRQF_VALID);
-#else
- irq_set_noprobe(__irq);
-#endif
- }
- if (!irq) {
- dev_warn(chip->dev, "No interrupt support on core IRQ\n");
- goto tsc_irq;
+ /* domain1: init charger/rtc/onkey irq domain*/
+ chip->irq_base = irq_alloc_descs(-1, 0, MAX8925_NR_IRQS, 0);
+ if (chip->irq_base < 0) {
+ dev_err(chip->dev, "Failed to allocate interrupts, ret:%d\n",
+ chip->irq_base);
+ return -EBUSY;
}

+ irq_domain_add_legacy(node, MAX8925_NR_IRQS, chip->irq_base, 0,
+ &max8925_irq_domain_ops, chip);
+ chip->core_irq = irq;
+ if (!chip->core_irq)
+ return -EBUSY;
+
ret = request_threaded_irq(irq, NULL, max8925_irq, flags,
"max8925", chip);
if (ret) {
dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
chip->core_irq = 0;
+ return -EBUSY;
}

-tsc_irq:
+ /* domain2: init touch irq domain*/
/* mask TSC interrupt */
max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0x0f);

- if (!pdata->tsc_irq) {
+ chip->tsc_irq_base = irq_alloc_descs(-1, 0, MAX8925_NR_TSC_IRQS, 0);
+ if (chip->tsc_irq < 0) {
+ dev_err(chip->dev, "Failed to allocate interrupts, ret:%d\n",
+ chip->tsc_irq_base);
+ return -EBUSY;
+ }
+
+ irq_domain_add_legacy(node, MAX8925_NR_TSC_IRQS, chip->tsc_irq_base, 0,
+ &max8925_irq_domain_ops, chip);
+
+ tsc_irq = irq_of_parse_and_map(node, 1);
+

I'm confused on this. Let's look at your definition in DTS.

+ pmic: max8925@3c {
+ compatible = "marvell,max8925";
+ reg = <0x3c>;
+ interrupts = <1 0>;
+ interrupt-parent = <&intcmux4>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
pmic is defined as interrupt controller. So it could be referenced as
interrupt-parent
by other drivers.

Now you split TSC_IRQS from original MAX8925_NR_IRQS. So TSC_IRQS are calculated
from 0. How do you distinguish TSC_IRQS from normal MAX8925_IRQS? Only
one phandle
is defined in your DTS file.

So either you keep TSC_IRQS in MAX8925_NR_IRQS, or you add a child
node to define
a new interrupt controller for tsc irqs.

+ if (!tsc_irq) {
dev_warn(chip->dev, "No interrupt support on TSC IRQ\n");
return 0;
}
- chip->tsc_irq = pdata->tsc_irq;
-
- ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
+ chip->tsc_irq = tsc_irq;
+ ret = request_threaded_irq(tsc_irq, NULL, max8925_tsc_irq,
flags, "max8925-tsc", chip);
if (ret) {
dev_err(chip->dev, "Failed to request TSC IRQ: %d\n", ret);
@@ -876,7 +903,7 @@ int __devinit max8925_device_init(struct max8925_chip *chip,
if (pdata && pdata->power) {
ret = mfd_add_devices(chip->dev, 0, &power_devs[0],
ARRAY_SIZE(power_devs),
- &power_supply_resources[0], 0, NULL);
+ &power_supply_resources[0], 0, NULL);
if (ret < 0) {
dev_err(chip->dev, "Failed to add power supply "
"subdev\n");
diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c
index d9e4b36..b713be6 100644
--- a/drivers/mfd/max8925-i2c.c
+++ b/drivers/mfd/max8925-i2c.c
@@ -135,13 +135,35 @@ static const struct i2c_device_id max8925_id_table[] = {
};
MODULE_DEVICE_TABLE(i2c, max8925_id_table);

+
+static int __devinit max8925_dt_init(struct device_node *np,
+ struct device *dev,
+ struct max8925_platform_data *pdata)
+{
+ return 0;
+}
+

If you don't need this interface, you need define it.

static int __devinit max8925_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max8925_platform_data *pdata = client->dev.platform_data;
static struct max8925_chip *chip;
+ struct device_node *node = client->dev.of_node;
+ int ret;

- if (!pdata) {
+ if (node && !pdata) {
+ /* parse DT to get platform data */
+ pdata = devm_kzalloc(&client->dev,
+ sizeof(struct max8925_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ ret = max8925_dt_init(node, &client->dev, pdata);
+ if (ret) {
+ pr_info("%s: failed to parse dt info\n", __func__);
+ return -EINVAL;
+ }
+ } else if (!pdata) {
pr_info("%s: platform data is missing\n", __func__);
return -EINVAL;
}
@@ -203,11 +225,18 @@ static int max8925_resume(struct device *dev)

static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);

+static const struct of_device_id max8925_dt_ids[] = {
+ { .compatible = "marvell,max8925", },

max8925 isn't the product of Marvell. The vendor is maxium.
+ {},
+};
+MODULE_DEVICE_TABLE(of, max8925_dt_ids);
+
static struct i2c_driver max8925_driver = {
.driver = {
.name = "max8925",
.owner = THIS_MODULE,
.pm = &max8925_pm_ops,
+ .of_match_table = of_match_ptr(max8925_dt_ids),
},
.probe = max8925_probe,
.remove = __devexit_p(max8925_remove),
@@ -217,7 +246,6 @@ static struct i2c_driver max8925_driver = {
static int __init max8925_i2c_init(void)
{
int ret;
-
ret = i2c_add_driver(&max8925_driver);
if (ret != 0)
pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
diff --git a/include/linux/mfd/max8925.h b/include/linux/mfd/max8925.h
index 74d8e29..67bc540 100644
--- a/include/linux/mfd/max8925.h
+++ b/include/linux/mfd/max8925.h
@@ -185,11 +185,18 @@ enum {
MAX8925_IRQ_GPM_SYSCKEN_R,
MAX8925_IRQ_RTC_ALARM1,
MAX8925_IRQ_RTC_ALARM0,
+ MAX8925_NR_IRQS,
+};
+
+/**/
+enum {
MAX8925_IRQ_TSC_STICK,
MAX8925_IRQ_TSC_NSTICK,
- MAX8925_NR_IRQS,
+ MAX8925_NR_TSC_IRQS,
};

+
+
struct max8925_chip {
struct device *dev;
struct i2c_client *i2c;
@@ -201,7 +208,7 @@ struct max8925_chip {
int irq_base;
int core_irq;
int tsc_irq;
-
+ int tsc_irq_base;
unsigned int wakeup_flag;
};

@@ -259,7 +266,6 @@ struct max8925_platform_data {
struct regulator_init_data *ldo20;

int irq_base;
- int tsc_irq;
};

extern int max8925_reg_read(struct i2c_client *, int);
--
1.7.0.4

update both dts and this patch in v2, please help me review again,
thank a lot!!

-Qing

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