linux-kernel - [PATCH 2/6] m68k: rtc: provide rtc_class

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Message-Id: <1456851608-3374907-3-git-send-email-arnd@arndb.de>
Date:	Tue,  1 Mar 2016 17:59:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Kyle McMartin <kyle@...artin.ca>, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] m68k: rtc: provide rtc_class_ops directly

The rtc-generic driver provides an architecture specific
wrapper on top of the generic rtc_class_ops abstraction,
and m68k has another abstraction on top, which is a bit
silly.

This changes the m68k rtc-generic device to provide its
rtc_class_ops directly, to reduce the number of layers
by one.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/m68k/kernel/time.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 3857737e3958..773b2187210d 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -87,6 +87,23 @@ void read_persistent_clock(struct timespec *ts)
 }
 
 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
+{
+	mach_hwclk(0, tm);
+	return rtc_valid_tm(tm);
+}
+
+static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
+{
+	if (mach_hwclk(1, tm) < 0)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+static const struct rtc_class_ops generic_rtc_ops = {
+	.read_time = rtc_generic_get_time,
+	.set_time = rtc_generic_set_time,
+};
 
 static int __init rtc_init(void)
 {
@@ -95,7 +112,10 @@ static int __init rtc_init(void)
 	if (!mach_hwclk)
 		return -ENODEV;
 
-	pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
+	/* or just call devm_rtc_device_register instead? */
+	pdev = platform_device_register_data(NULL, "rtc-generic", -1,
+					     &generic_rtc_ops,
+					     sizeof(generic_rtc_ops));
 	return PTR_ERR_OR_ZERO(pdev);
 }
 
-- 
2.7.0