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Date: Sun, 21 Jun 2020 00:42:19 +0200
From: Jonathan Neuschäfer <j.neuschaefer@....net>
To: linux-kernel@...r.kernel.org
Cc: Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
Jonathan Neuschäfer <j.neuschaefer@....net>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Sam Ravnborg <sam@...nborg.org>,
Linus Walleij <linus.walleij@...aro.org>,
Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
Stephan Gerhold <stephan@...hold.net>,
Lubomir Rintel <lkundrak@...sk>,
Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
devicetree@...r.kernel.org, linux-pwm@...r.kernel.org,
linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Heiko Stuebner <heiko@...ech.de>,
Josua Mayer <josua.mayer@....eu>,
Andreas Kemnade <andreas@...nade.info>
Subject: [RFC PATCH 08/10] rtc: New driver for RTC in Netronix embedded controller
With this driver, mainline Linux can keep its time and date in sync with
the vendor kernel.
Advanced functionality like alarm and automatic power-on is not yet
supported.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
drivers/rtc/Kconfig | 4 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-ntxec.c | 115 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 120 insertions(+)
create mode 100644 drivers/rtc/rtc-ntxec.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b54d87d45c89b..2310d08933f9c 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1300,6 +1300,10 @@ config RTC_DRV_CROS_EC
This driver can also be built as a module. If so, the module
will be called rtc-cros-ec.
+config RTC_DRV_NTXEC
+ tristate "Netronix embedded controller RTC driver"
+ depends on MFD_NTXEC
+
comment "on-CPU RTC drivers"
config RTC_DRV_ASM9260
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 0721752c6ed4c..8653d04aefa99 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -111,6 +111,7 @@ obj-$(CONFIG_RTC_DRV_MT7622) += rtc-mt7622.o
obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o
obj-$(CONFIG_RTC_DRV_MXC_V2) += rtc-mxc_v2.o
+obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o
obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o
diff --git a/drivers/rtc/rtc-ntxec.c b/drivers/rtc/rtc-ntxec.c
new file mode 100644
index 0000000000000..44d5a5eedb597
--- /dev/null
+++ b/drivers/rtc/rtc-ntxec.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright 2020 Jonathan Neuschäfer
+
+#include <linux/rtc.h>
+#include <linux/mfd/ntxec.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+struct ntxec_rtc {
+ struct device *dev;
+ struct ntxec *ec;
+};
+
+#define NTXEC_WRITE_YEAR 0x10
+#define NTXEC_WRITE_MONTH 0x11
+#define NTXEC_WRITE_DAY 0x12
+#define NTXEC_WRITE_HOUR 0x13
+#define NTXEC_WRITE_MINUTE 0x14
+#define NTXEC_WRITE_SECOND 0x15
+
+#define NTXEC_READ_YM 0x20
+#define NTXEC_READ_DH 0x21
+#define NTXEC_READ_MS 0x22
+
+
+static int ntxec_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct ntxec_rtc *rtc = dev_get_drvdata(dev);
+ int res;
+
+ res = ntxec_read16(rtc->ec, NTXEC_READ_YM);
+ if (res < 0)
+ return res;
+
+ tm->tm_year = (res >> 8) + 100;
+ tm->tm_mon = (res & 0xff) - 1;
+
+ res = ntxec_read16(rtc->ec, NTXEC_READ_DH);
+ if (res < 0)
+ return res;
+
+ tm->tm_mday = res >> 8;
+ tm->tm_hour = res & 0xff;
+
+ res = ntxec_read16(rtc->ec, NTXEC_READ_MS);
+ if (res < 0)
+ return res;
+
+ tm->tm_min = res >> 8;
+ tm->tm_sec = res & 0xff;
+
+ return 0;
+}
+
+static int ntxec_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct ntxec_rtc *rtc = dev_get_drvdata(dev);
+ int res = 0;
+
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_YEAR, tm->tm_year - 100);
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_MONTH, tm->tm_mon + 1);
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_DAY, tm->tm_mday);
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_HOUR, tm->tm_hour);
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_MINUTE, tm->tm_min);
+ res |= ntxec_write8(rtc->ec, NTXEC_WRITE_SECOND, tm->tm_sec);
+
+ return (res < 0)? -EIO : 0;
+}
+
+static const struct rtc_class_ops ntxec_rtc_ops = {
+ .read_time = ntxec_read_time,
+ .set_time = ntxec_set_time,
+};
+
+static int ntxec_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtcdev;
+ struct ntxec_rtc *rtc;
+
+ rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+ if (!rtc)
+ return -ENOMEM;
+
+ rtc->dev = &pdev->dev;
+ rtc->ec = dev_get_drvdata(pdev->dev.parent);
+ platform_set_drvdata(pdev, rtc);
+
+ rtcdev = devm_rtc_device_register(&pdev->dev, "ntxec-rtc",
+ &ntxec_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtcdev))
+ return PTR_ERR(rtc);
+
+ return 0;
+}
+
+static const struct of_device_id ntxec_rtc_of_match[] = {
+ { .compatible = "netronix,ntxec-rtc" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ntxec_rtc_of_match);
+
+static struct platform_driver ntxec_rtc_driver = {
+ .driver = {
+ .name = "ntxec-rtc",
+ .of_match_table = ntxec_rtc_of_match,
+ },
+ .probe = ntxec_rtc_probe,
+};
+module_platform_driver(ntxec_rtc_driver);
+
+MODULE_AUTHOR("Jonathan Neuschäfer <j.neuschaefer@....net>");
+MODULE_DESCRIPTION("RTC driver for Netronix EC");
+MODULE_LICENSE("GPL");
--
2.27.0
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