Merge tag 'rtc-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "There is nothing scary this cycle, mostly driver fixes and updates.

  The core fix has been in for a while and has been tested on multiple
  kernel revisions by multiple teams.

  Core:
   - Fix setting the alarm to the next expiring timer

  New drivers:
   - Mediatek MT7622 RTC
   - NXP PCF85363
   - Spreadtrum SC27xx PMIC RTC

  Drivers updates:
   - Use generic nvmem to expose the Non volatile ram for ds1305,
     ds1511, m48t86 and omap
   - abx80x: solve possible race condition at probe
   - armada38x: support trimming the RTC oscillator
   - at91rm9200: fix reading the alarm value at boot
   - ds1511: allow waking platform
   - m41t80: rework square wave output
   - pcf8523: support trimming the RTC oscillator
   - pcf8563: fix clock output rate
   - pl031: make interrupt optional
   - xgene: fix suspend/resume"

* tag 'rtc-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (50 commits)
  dt-bindings: rtc: imxdi: Improve the bindings text
  rtc: sc27xx: Add Spreadtrum SC27xx PMIC RTC driver
  dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation
  rtc: at91rm9200: fix reading alarm value
  rtc: at91rm9200: stop calculating yday in at91_rtc_readalarm
  rtc: sysfs: Use time64_t variables to set time/alarm
  rtc: xgene: mark PM functions as __maybe_unused
  rtc: xgene: Fix suspend/resume
  rtc: pcf8563: don't alway enable the alarm
  rtc: pcf8563: fix output clock rate
  rtc: rx8010: Fix for incorrect return value
  rtc: rx8010: Specify correct address for RX8010_RESV31
  rtc: rx8010: Remove duplicate define
  rtc: m41t80: remove unneeded checks from m41t80_sqw_set_rate
  rtc: m41t80: avoid i2c read in m41t80_sqw_is_prepared
  rtc: m41t80: avoid i2c read in m41t80_sqw_recalc_rate
  rtc: m41t80: fix m41t80_sqw_round_rate return value
  rtc: m41t80: m41t80_sqw_set_rate should return 0 on success
  rtc: add support for NXP PCF85363 real-time clock
  rtc: omap: Support scratch registers
  ...

1 files changed, 54 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 13f7cd11c07e..1d666ac9ef70 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -70,6 +70,10 @@
 #define OMAP_RTC_COMP_MSB_REG		0x50
 #define OMAP_RTC_OSC_REG		0x54
 
+#define OMAP_RTC_SCRATCH0_REG		0x60
+#define OMAP_RTC_SCRATCH1_REG		0x64
+#define OMAP_RTC_SCRATCH2_REG		0x68
+
 #define OMAP_RTC_KICK0_REG		0x6c
 #define OMAP_RTC_KICK1_REG		0x70
 
@@ -667,6 +671,45 @@ static struct pinctrl_desc rtc_pinctrl_desc = {
 	.owner = THIS_MODULE,
 };
 
+static int omap_rtc_scratch_read(void *priv, unsigned int offset, void *_val,
+				 size_t bytes)
+{
+	struct omap_rtc	*rtc = priv;
+	u32 *val = _val;
+	int i;
+
+	for (i = 0; i < bytes / 4; i++)
+		val[i] = rtc_readl(rtc,
+				   OMAP_RTC_SCRATCH0_REG + offset + (i * 4));
+
+	return 0;
+}
+
+static int omap_rtc_scratch_write(void *priv, unsigned int offset, void *_val,
+				  size_t bytes)
+{
+	struct omap_rtc	*rtc = priv;
+	u32 *val = _val;
+	int i;
+
+	rtc->type->unlock(rtc);
+	for (i = 0; i < bytes / 4; i++)
+		rtc_writel(rtc,
+			   OMAP_RTC_SCRATCH0_REG + offset + (i * 4), val[i]);
+	rtc->type->lock(rtc);
+
+	return 0;
+}
+
+static struct nvmem_config omap_rtc_nvmem_config = {
+	.name = "omap_rtc_scratch",
+	.word_size = 4,
+	.stride = 4,
+	.size = OMAP_RTC_KICK0_REG - OMAP_RTC_SCRATCH0_REG,
+	.reg_read = omap_rtc_scratch_read,
+	.reg_write = omap_rtc_scratch_write,
+};
+
 static int omap_rtc_probe(struct platform_device *pdev)
 {
 	struct omap_rtc	*rtc;
@@ -797,13 +840,16 @@ static int omap_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, true);
 
-	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-			&omap_rtc_ops, THIS_MODULE);
+	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc->rtc)) {
 		ret = PTR_ERR(rtc->rtc);
 		goto err;
 	}
 
+	rtc->rtc->ops = &omap_rtc_ops;
+	omap_rtc_nvmem_config.priv = rtc;
+	rtc->rtc->nvmem_config = &omap_rtc_nvmem_config;
+
 	/* handle periodic and alarm irqs */
 	ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,
 			dev_name(&rtc->rtc->dev), rtc);
@@ -830,9 +876,14 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	rtc->pctldev = pinctrl_register(&rtc_pinctrl_desc, &pdev->dev, rtc);
 	if (IS_ERR(rtc->pctldev)) {
 		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
-		return PTR_ERR(rtc->pctldev);
+		ret = PTR_ERR(rtc->pctldev);
+		goto err;
 	}
 
+	ret = rtc_register_device(rtc->rtc);
+	if (ret)
+		goto err;
+
 	return 0;
 
 err: