Commit dab5aec6 authored by Chris Brandt's avatar Chris Brandt Committed by Alexandre Belloni
Browse files

rtc: sh: add support for rza series 



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: default avatarChris Brandt <chris.brandt@renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 65e9e65c

drivers/rtc/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -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.

drivers/rtc/rtc-sh.c

+28 −5
Original line number Diff line number Diff line
@@ -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;



	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);

	} 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),

};