[PATCH v2 4/6] rtc: pm8xxx: add support for devicetree
From: Josh Cartwright
Date: Mon Mar 10 2014 - 14:50:56 EST
Add support for describing the PM8921/PM8058 RTC in device tree.
Additionally:
- drop support for describing the RTC using platform data,
as there are no current in tree users who do so.
- make allow_set_time a device-specific flag, instead of mucking
with the rtc_ops
Signed-off-by: Josh Cartwright <joshc@xxxxxxxxxxxxxx>
Reviewed-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
drivers/rtc/rtc-pm8xxx.c | 52 +++++++++++++++++++++++-------------------
include/linux/mfd/pm8xxx/rtc.h | 25 --------------------
2 files changed, 29 insertions(+), 48 deletions(-)
delete mode 100644 include/linux/mfd/pm8xxx/rtc.h
diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index 91ac2e3..6e3cd34 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -9,7 +9,7 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
-
+#include <linux/of.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rtc.h>
@@ -19,9 +19,6 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/mfd/pm8xxx/rtc.h>
-
-
/* RTC Register offsets from RTC CTRL REG */
#define PM8XXX_ALARM_CTRL_OFFSET 0x01
#define PM8XXX_RTC_WRITE_OFFSET 0x02
@@ -39,6 +36,7 @@
* struct pm8xxx_rtc - rtc driver internal structure
* @rtc: rtc device for this driver.
* @regmap: regmap used to access RTC registers
+ * @allow_set_time: indicates whether writing to the RTC is allowed
* @rtc_alarm_irq: rtc alarm irq number.
* @rtc_base: address of rtc control register.
* @rtc_read_base: base address of read registers.
@@ -51,6 +49,7 @@
struct pm8xxx_rtc {
struct rtc_device *rtc;
struct regmap *regmap;
+ bool allow_set_time;
int rtc_alarm_irq;
int rtc_base;
int rtc_read_base;
@@ -75,6 +74,9 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, ctrl_reg;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
+ if (!rtc_dd->allow_set_time)
+ return -EACCES;
+
rtc_tm_to_time(tm, &secs);
for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
@@ -298,8 +300,9 @@ rtc_rw_fail:
return rc;
}
-static struct rtc_class_ops pm8xxx_rtc_ops = {
+static const struct rtc_class_ops pm8xxx_rtc_ops = {
.read_time = pm8xxx_rtc_read_time,
+ .set_time = pm8xxx_rtc_set_time,
.set_alarm = pm8xxx_rtc_set_alarm,
.read_alarm = pm8xxx_rtc_read_alarm,
.alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
@@ -353,18 +356,26 @@ rtc_alarm_handled:
return IRQ_HANDLED;
}
+/*
+ * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
+ */
+static const struct of_device_id pm8xxx_id_table[] = {
+ { .compatible = "qcom,pm8921-rtc", .data = (void *) 0x11D },
+ { .compatible = "qcom,pm8058-rtc", .data = (void *) 0x1E8 },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
+
static int pm8xxx_rtc_probe(struct platform_device *pdev)
{
int rc;
unsigned int ctrl_reg;
- bool rtc_write_enable = false;
struct pm8xxx_rtc *rtc_dd;
- struct resource *rtc_resource;
- const struct pm8xxx_rtc_platform_data *pdata =
- dev_get_platdata(&pdev->dev);
+ const struct of_device_id *match;
- if (pdata != NULL)
- rtc_write_enable = pdata->rtc_write_enable;
+ match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
if (rtc_dd == NULL)
@@ -385,14 +396,10 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
return -ENXIO;
}
- rtc_resource = platform_get_resource_byname(pdev, IORESOURCE_IO,
- "pmic_rtc_base");
- if (!(rtc_resource && rtc_resource->start)) {
- dev_err(&pdev->dev, "RTC IO resource absent!\n");
- return -ENXIO;
- }
+ rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
+ "allow-set-time");
- rtc_dd->rtc_base = rtc_resource->start;
+ rtc_dd->rtc_base = (long) match->data;
/* Setup RTC register addresses */
rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
@@ -419,8 +426,6 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
}
rtc_dd->ctrl_reg = ctrl_reg;
- if (rtc_write_enable)
- pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
platform_set_drvdata(pdev, rtc_dd);
@@ -479,9 +484,10 @@ static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
static struct platform_driver pm8xxx_rtc_driver = {
.probe = pm8xxx_rtc_probe,
.driver = {
- .name = PM8XXX_RTC_DEV_NAME,
- .owner = THIS_MODULE,
- .pm = &pm8xxx_rtc_pm_ops,
+ .name = "rtc-pm8xxx",
+ .owner = THIS_MODULE,
+ .pm = &pm8xxx_rtc_pm_ops,
+ .of_match_table = pm8xxx_id_table,
},
};
diff --git a/include/linux/mfd/pm8xxx/rtc.h b/include/linux/mfd/pm8xxx/rtc.h
deleted file mode 100644
index 14f1983..0000000
--- a/include/linux/mfd/pm8xxx/rtc.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#ifndef __RTC_PM8XXX_H__
-#define __RTC_PM8XXX_H__
-
-#define PM8XXX_RTC_DEV_NAME "rtc-pm8xxx"
-/**
- * struct pm8xxx_rtc_pdata - RTC driver platform data
- * @rtc_write_enable: variable stating RTC write capability
- */
-struct pm8xxx_rtc_platform_data {
- bool rtc_write_enable;
-};
-
-#endif /* __RTC_PM8XXX_H__ */
--
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