rtc: pm8xxx: add support for devicetree
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@codeaurora.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Lee Jones <lee.jones@linaro.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -9,7 +9,7 @@
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/rtc.h>
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@ -19,9 +19,6 @@
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/mfd/pm8xxx/rtc.h>
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/* RTC Register offsets from RTC CTRL REG */
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#define PM8XXX_ALARM_CTRL_OFFSET 0x01
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#define PM8XXX_RTC_WRITE_OFFSET 0x02
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@ -39,6 +36,7 @@
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* struct pm8xxx_rtc - rtc driver internal structure
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* @rtc: rtc device for this driver.
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* @regmap: regmap used to access RTC registers
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* @allow_set_time: indicates whether writing to the RTC is allowed
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* @rtc_alarm_irq: rtc alarm irq number.
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* @rtc_base: address of rtc control register.
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* @rtc_read_base: base address of read registers.
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@ -51,6 +49,7 @@
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struct pm8xxx_rtc {
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struct rtc_device *rtc;
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struct regmap *regmap;
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bool allow_set_time;
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int rtc_alarm_irq;
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int rtc_base;
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int rtc_read_base;
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@ -75,6 +74,9 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
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u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, ctrl_reg;
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struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
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if (!rtc_dd->allow_set_time)
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return -EACCES;
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rtc_tm_to_time(tm, &secs);
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for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
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@ -298,8 +300,9 @@ rtc_rw_fail:
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return rc;
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}
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static struct rtc_class_ops pm8xxx_rtc_ops = {
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static const struct rtc_class_ops pm8xxx_rtc_ops = {
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.read_time = pm8xxx_rtc_read_time,
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.set_time = pm8xxx_rtc_set_time,
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.set_alarm = pm8xxx_rtc_set_alarm,
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.read_alarm = pm8xxx_rtc_read_alarm,
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.alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
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@ -353,18 +356,26 @@ rtc_alarm_handled:
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return IRQ_HANDLED;
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}
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/*
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* Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
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*/
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static const struct of_device_id pm8xxx_id_table[] = {
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{ .compatible = "qcom,pm8921-rtc", .data = (void *) 0x11D },
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{ .compatible = "qcom,pm8058-rtc", .data = (void *) 0x1E8 },
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{ },
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};
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MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
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static int pm8xxx_rtc_probe(struct platform_device *pdev)
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{
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int rc;
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unsigned int ctrl_reg;
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bool rtc_write_enable = false;
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struct pm8xxx_rtc *rtc_dd;
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struct resource *rtc_resource;
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const struct pm8xxx_rtc_platform_data *pdata =
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dev_get_platdata(&pdev->dev);
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const struct of_device_id *match;
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if (pdata != NULL)
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rtc_write_enable = pdata->rtc_write_enable;
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match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
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if (!match)
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return -ENXIO;
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rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
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if (rtc_dd == NULL)
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@ -385,14 +396,10 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
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return -ENXIO;
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}
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rtc_resource = platform_get_resource_byname(pdev, IORESOURCE_IO,
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"pmic_rtc_base");
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if (!(rtc_resource && rtc_resource->start)) {
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dev_err(&pdev->dev, "RTC IO resource absent!\n");
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return -ENXIO;
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}
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rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
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"allow-set-time");
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rtc_dd->rtc_base = rtc_resource->start;
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rtc_dd->rtc_base = (long) match->data;
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/* Setup RTC register addresses */
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rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
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@ -419,8 +426,6 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
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}
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rtc_dd->ctrl_reg = ctrl_reg;
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if (rtc_write_enable)
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pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
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platform_set_drvdata(pdev, rtc_dd);
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@ -479,9 +484,10 @@ static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
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static struct platform_driver pm8xxx_rtc_driver = {
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.probe = pm8xxx_rtc_probe,
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.driver = {
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.name = PM8XXX_RTC_DEV_NAME,
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.owner = THIS_MODULE,
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.pm = &pm8xxx_rtc_pm_ops,
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.name = "rtc-pm8xxx",
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.owner = THIS_MODULE,
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.pm = &pm8xxx_rtc_pm_ops,
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.of_match_table = pm8xxx_id_table,
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},
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};
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@ -1,25 +0,0 @@
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/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __RTC_PM8XXX_H__
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#define __RTC_PM8XXX_H__
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#define PM8XXX_RTC_DEV_NAME "rtc-pm8xxx"
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/**
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* struct pm8xxx_rtc_pdata - RTC driver platform data
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* @rtc_write_enable: variable stating RTC write capability
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*/
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struct pm8xxx_rtc_platform_data {
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bool rtc_write_enable;
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};
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#endif /* __RTC_PM8XXX_H__ */
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