This same RTC is used in RZ/A series MPUs, therefore with some slight
changes, this driver can be reused. Additionally, since ARM architectures
require Device Tree configurations, device tree support has been added.
Signed-off-by: Chris Brandt <chris.bra...@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
v2:
* removed HAVE_CLK from Kconfig
* when using DT, look for "fck" instead of "rtc0"
* changed (res == NULL) to (!res)
* added Reviewed-by
---
drivers/rtc/Kconfig | 4 ++--
drivers/rtc/rtc-sh.c | 33 ++++++++++++++++++++++++++++-----
2 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index ee1b0e9dde79..c2d1f0ed47a1 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1303,10 +1303,10 @@ config RTC_DRV_SA1100
config RTC_DRV_SH
tristate "SuperH On-Chip RTC"
- depends on SUPERH && HAVE_CLK
+ depends on SUPERH || ARCH_RENESAS
help
Say Y here to enable support for the on-chip RTC found in
- most SuperH processors.
+ most SuperH processors. This RTC is also found in RZ/A SoCs.
To compile this driver as a module, choose M here: the
module will be called rtc-sh.
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index c626e43a9cbb..00b396e96cbe 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -27,7 +27,15 @@
#include <linux/log2.h>
#include <linux/clk.h>
#include <linux/slab.h>
+#ifdef CONFIG_SUPERH
#include <asm/rtc.h>
+#else
+/* Default values for RZ/A RTC */
+#define rtc_reg_size sizeof(u16)
+#define RTC_BIT_INVERTED 0 /* no chip bugs */
+#define RTC_CAP_4_DIGIT_YEAR (1 << 0)
+#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR
+#endif
#define DRV_NAME "sh-rtc"
@@ -570,6 +578,8 @@ static int __init sh_rtc_probe(struct platform_device *pdev)
rtc->alarm_irq = platform_get_irq(pdev, 2);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res)
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (unlikely(res == NULL)) {
dev_err(&pdev->dev, "No IO resource\n");
return -ENOENT;
@@ -587,12 +597,15 @@ static int __init sh_rtc_probe(struct platform_device
*pdev)
if (unlikely(!rtc->regbase))
return -EINVAL;
- clk_id = pdev->id;
- /* With a single device, the clock id is still "rtc0" */
- if (clk_id < 0)
- clk_id = 0;
+ if (!pdev->dev.of_node) {
+ clk_id = pdev->id;
+ /* With a single device, the clock id is still "rtc0" */
+ if (clk_id < 0)
+ clk_id = 0;
- snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
+ snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
+ } else
+ snprintf(clk_name, sizeof(clk_name), "fck");
rtc->clk = devm_clk_get(&pdev->dev, clk_name);
if (IS_ERR(rtc->clk)) {
@@ -608,6 +621,8 @@ static int __init sh_rtc_probe(struct platform_device *pdev)
clk_enable(rtc->clk);
rtc->capabilities = RTC_DEF_CAPABILITIES;
+
+#ifdef CONFIG_SUPERH
if (dev_get_platdata(&pdev->dev)) {
struct sh_rtc_platform_info *pinfo =
dev_get_platdata(&pdev->dev);
@@ -618,6 +633,7 @@ static int __init sh_rtc_probe(struct platform_device *pdev)
*/
rtc->capabilities |= pinfo->capabilities;
}
+#endif
if (rtc->carry_irq <= 0) {
/* register shared periodic/carry/alarm irq */
@@ -738,10 +754,17 @@ static int sh_rtc_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume);
+static const struct of_device_id sh_rtc_of_match[] = {
+ { .compatible = "renesas,sh-rtc", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sh_rtc_of_match);
+
static struct platform_driver sh_rtc_platform_driver = {
.driver = {
.name = DRV_NAME,
.pm = &sh_rtc_pm_ops,
+ .of_match_table = sh_rtc_of_match,
},
.remove = __exit_p(sh_rtc_remove),
};
--
2.11.0
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