rtc: max77686: move initialisation of rtc regmap, irq chip locally

To make RTC block of MAX77686/MAX77802 as independent driver,
move the registration of i2c device, regmap for register access
and irq_chip for interrupt support inside the RTC driver.
Removed the same initialisation from MFD driver.

Having this change will allow to reuse this driver for different
PMIC/devices from Maxim Semiconductor if they kept same RTC IP on
different PMIC. Some of examples as PMIC MAX77620, MAX20024 where
same RTC IP used and hence driver for these chips will use this
driver only for RTC support.

Suggested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 127 insertions, 21 deletions

diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 8fe1092c4795..5e924f3cde90 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -12,6 +12,7 @@
  *
  */
 
+#include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/rtc.h>
 #include <linux/delay.h>
@@ -22,6 +23,9 @@
 #include <linux/irqdomain.h>
 #include <linux/regmap.h>
 
+#define MAX77686_I2C_ADDR_RTC           (0x0C >> 1)
+#define MAX77686_INVALID_I2C_ADDR       (-1)
+
 /* RTC Control Register */
 #define BCD_EN_SHIFT                    0
 #define BCD_EN_MASK                     BIT(BCD_EN_SHIFT)
@@ -68,8 +72,10 @@ struct max77686_rtc_driver_data {
         const unsigned int      *map;
         /* Has a separate alarm enable register? */
         bool                    alarm_enable_reg;
-        /* Has a separate I2C regmap for the RTC? */
-        bool                    separate_i2c_addr;
+        /* I2C address for RTC block */
+        int                     rtc_i2c_addr;
+        /* RTC IRQ CHIP for regmap */
+        const struct regmap_irq_chip *rtc_irq_chip;
 };
 
 struct max77686_rtc_info {
@@ -82,7 +88,9 @@ struct max77686_rtc_info {
         struct regmap           *rtc_regmap;
 
         const struct max77686_rtc_driver_data *drv_data;
+        struct regmap_irq_chip_data *rtc_irq_data;
 
+        int rtc_irq;
         int virq;
         int rtc_24hr_mode;
 };
@@ -153,12 +161,32 @@ static const unsigned int max77686_map[REG_RTC_END] = {
         [REG_RTC_AE1]        = REG_RTC_NONE,
 };
 
+static const struct regmap_irq max77686_rtc_irqs[] = {
+        /* RTC interrupts */
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC60S_MSK, },
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA1_MSK, },
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA2_MSK, },
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_SMPL_MSK, },
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC1S_MSK, },
+        { .reg_offset = 0, .mask = MAX77686_RTCINT_WTSR_MSK, },
+};
+
+static const struct regmap_irq_chip max77686_rtc_irq_chip = {
+        .name           = "max77686-rtc",
+        .status_base    = MAX77686_RTC_INT,
+        .mask_base      = MAX77686_RTC_INTM,
+        .num_regs       = 1,
+        .irqs           = max77686_rtc_irqs,
+        .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
+};
+
 static const struct max77686_rtc_driver_data max77686_drv_data = {
         .delay = 16000,
         .mask  = 0x7f,
         .map   = max77686_map,
         .alarm_enable_reg  = false,
-        .separate_i2c_addr = true,
+        .rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
+        .rtc_irq_chip = &max77686_rtc_irq_chip,
 };
 
 static const unsigned int max77802_map[REG_RTC_END] = {
@@ -190,12 +218,22 @@ static const unsigned int max77802_map[REG_RTC_END] = {
         [REG_RTC_AE1]        = MAX77802_RTC_AE1,
 };
 
+static const struct regmap_irq_chip max77802_rtc_irq_chip = {
+        .name           = "max77802-rtc",
+        .status_base    = MAX77802_RTC_INT,
+        .mask_base      = MAX77802_RTC_INTM,
+        .num_regs       = 1,
+        .irqs           = max77686_rtc_irqs, /* same masks as 77686 */
+        .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
+};
+
 static const struct max77686_rtc_driver_data max77802_drv_data = {
         .delay = 200,
         .mask  = 0xff,
         .map   = max77802_map,
         .alarm_enable_reg  = true,
-        .separate_i2c_addr = false,
+        .rtc_i2c_addr = MAX77686_INVALID_I2C_ADDR,
+        .rtc_irq_chip = &max77802_rtc_irq_chip,
 };
 
 static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
@@ -599,9 +637,65 @@ static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
         return ret;
 }
 
+static const struct regmap_config max77686_rtc_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
+static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
+{
+        struct device *parent = info->dev->parent;
+        struct i2c_client *parent_i2c = to_i2c_client(parent);
+        int ret;
+
+        info->rtc_irq = parent_i2c->irq;
+
+        info->regmap = dev_get_regmap(parent, NULL);
+        if (!info->regmap) {
+                dev_err(info->dev, "Failed to get rtc regmap\n");
+                return -ENODEV;
+        }
+
+        if (info->drv_data->rtc_i2c_addr == MAX77686_INVALID_I2C_ADDR) {
+                info->rtc_regmap = info->regmap;
+                goto add_rtc_irq;
+        }
+
+        info->rtc = i2c_new_dummy(parent_i2c->adapter,
+                                  info->drv_data->rtc_i2c_addr);
+        if (!info->rtc) {
+                dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
+                return -ENODEV;
+        }
+
+        info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
+                                                &max77686_rtc_regmap_config);
+        if (IS_ERR(info->rtc_regmap)) {
+                ret = PTR_ERR(info->rtc_regmap);
+                dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
+                goto err_unregister_i2c;
+        }
+
+add_rtc_irq:
+        ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq,
+                                  IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
+                                  IRQF_SHARED, 0, info->drv_data->rtc_irq_chip,
+                                  &info->rtc_irq_data);
+        if (ret < 0) {
+                dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
+                goto err_unregister_i2c;
+        }
+
+        return 0;
+
+err_unregister_i2c:
+        if (info->rtc)
+                i2c_unregister_device(info->rtc);
+        return ret;
+}
+
 static int max77686_rtc_probe(struct platform_device *pdev)
 {
-        struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
         struct max77686_rtc_info *info;
         const struct platform_device_id *id = platform_get_device_id(pdev);
         int ret;
@@ -613,18 +707,16 @@ static int max77686_rtc_probe(struct platform_device *pdev)
 
         mutex_init(&info->lock);
         info->dev = &pdev->dev;
-        info->rtc = max77686->rtc;
         info->drv_data = (const struct max77686_rtc_driver_data *)
                 id->driver_data;
 
-        info->regmap = max77686->regmap;
-        info->rtc_regmap = (info->drv_data->separate_i2c_addr) ?
-                            max77686->rtc_regmap : info->regmap;
+        ret = max77686_init_rtc_regmap(info);
+        if (ret < 0)
+                return ret;
 
         platform_set_drvdata(pdev, info);
 
         ret = max77686_rtc_init_reg(info);
-
         if (ret < 0) {
                 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
                 goto err_rtc;
@@ -643,30 +735,43 @@ static int max77686_rtc_probe(struct platform_device *pdev)
                 goto err_rtc;
         }
 
-        if (!max77686->rtc_irq_data) {
-                ret = -EINVAL;
-                dev_err(&pdev->dev, "No RTC regmap IRQ chip\n");
-                goto err_rtc;
-        }
-
-        info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
+        info->virq = regmap_irq_get_virq(info->rtc_irq_data,
                                          MAX77686_RTCIRQ_RTCA1);
         if (info->virq <= 0) {
                 ret = -ENXIO;
                 goto err_rtc;
         }
 
-        ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
-                                        max77686_rtc_alarm_irq, 0,
-                                        "rtc-alarm1", info);
-        if (ret < 0)
+        ret = request_threaded_irq(info->virq, NULL, max77686_rtc_alarm_irq, 0,
+                                   "rtc-alarm1", info);
+        if (ret < 0) {
                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
                         info->virq, ret);
+                goto err_rtc;
+        }
+
+        return 0;
 
 err_rtc:
+        regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
+        if (info->rtc)
+                i2c_unregister_device(info->rtc);
+
         return ret;
 }
 
+static int max77686_rtc_remove(struct platform_device *pdev)
+{
+        struct max77686_rtc_info *info = platform_get_drvdata(pdev);
+
+        free_irq(info->virq, info);
+        regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
+        if (info->rtc)
+                i2c_unregister_device(info->rtc);
+
+        return 0;
+}
+
 #ifdef CONFIG_PM_SLEEP
 static int max77686_rtc_suspend(struct device *dev)
 {
@@ -707,6 +812,7 @@ static struct platform_driver max77686_rtc_driver = {
                 .pm     = &max77686_rtc_pm_ops,
         },
         .probe          = max77686_rtc_probe,
+        .remove         = max77686_rtc_remove,
         .id_table       = rtc_id,
 };