From: Priyanka Jain <Priyanka.Jain@freescale.com>
To: <akpm@linux-foundation.org>, <w.sang@pengutronix.de>,
<rtc-linux@googlegroups.com>, <linuxppc-dev@lists.ozlabs.org>,
<a.zummo@towertech.it>, <p_gortmaker@yahoo.com>
Cc: Priyanka Jain <Priyanka.Jain@freescale.com>
Subject: [PATCH] Add support for pt7c4338 (rtc device) in rtc-ds1307 driver
Date: Thu, 26 May 2011 12:33:29 +0530 [thread overview]
Message-ID: <1306393409-16153-1-git-send-email-Priyanka.Jain@freescale.com> (raw)
PT7C4338 chip is being manufactured by Pericom Technology Inc.
It is a serial real-time clock which provides:
1)Low-power clock/calendar.
2)Programmable square-wave output.
It has 56 bytes of nonvolatile RAM.
Its register set is same as that of rtc device: DS1307.
Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
---
Changes :
This patch will supersede patch:
"RTC driver(Linux) for PT7C4338 chip"
Incorporting Wolfram Sang's comments to reuse ds1307 driver.
drivers/rtc/Kconfig | 6 +++---
drivers/rtc/rtc-ds1307.c | 7 +++++++
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b8f4e9e..c6045dd 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -126,13 +126,13 @@ comment "I2C RTC drivers"
if I2C
config RTC_DRV_DS1307
- tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
+ tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025, PT7C4338"
help
If you say yes here you get support for various compatible RTC
chips (often with battery backup) connected with I2C. This driver
should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
- EPSON RX-8025 and probably other chips. In some cases the RTC
- must already have been initialized (by manufacturing or a
+ EPSON RX-8025, PT7C4338 and probably other chips. In some cases
+ the RTC must already have been initialized (by manufacturing or a
bootloader).
The first seven registers on these chips hold an RTC, and other
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4724ba3..8436f16 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -4,6 +4,8 @@
* Copyright (C) 2005 James Chapman (ds1337 core)
* Copyright (C) 2006 David Brownell
* Copyright (C) 2009 Matthias Fuchs (rx8025 support)
+ * Copyright (C) 2011 Priyanka Jain (Priyanka.Jain@freescale.com)
+ * (pt7c4338 support)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -34,6 +36,7 @@ enum ds_type {
ds_1388,
ds_3231,
m41t00,
+ pt7c4338,
rx_8025,
// rs5c372 too? different address...
};
@@ -137,6 +140,8 @@ static const struct chip_desc chips[] = {
},
[m41t00] = {
},
+[pt7c4338] = {
+},
[rx_8025] = {
}, };
@@ -149,6 +154,7 @@ static const struct i2c_device_id ds1307_id[] = {
{ "ds1340", ds_1340 },
{ "ds3231", ds_3231 },
{ "m41t00", m41t00 },
+ { "pt7c4338", pt7c4338 },
{ "rx8025", rx_8025 },
{ }
};
@@ -769,6 +775,7 @@ read_rtc:
switch (ds1307->type) {
case ds_1307:
case m41t00:
+ case pt7c4338:
/* clock halted? turn it on, so clock can tick. */
if (tmp & DS1307_BIT_CH) {
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
--
1.6.5.6
next reply other threads:[~2011-05-26 7:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-26 7:03 Priyanka Jain [this message]
2011-05-26 9:10 ` [PATCH] Add support for pt7c4338 (rtc device) in rtc-ds1307 driver Wolfram Sang
2011-05-30 4:47 ` Jain Priyanka-B32167
2011-05-30 8:24 ` Wolfram Sang
2011-05-30 14:29 ` [rtc-linux] " Tabi Timur-B04825
2011-05-30 14:50 ` Wolfram Sang
2011-05-30 16:57 ` Anton Vorontsov
2011-06-03 18:03 ` Grant Likely
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1306393409-16153-1-git-send-email-Priyanka.Jain@freescale.com \
--to=priyanka.jain@freescale.com \
--cc=a.zummo@towertech.it \
--cc=akpm@linux-foundation.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=p_gortmaker@yahoo.com \
--cc=rtc-linux@googlegroups.com \
--cc=w.sang@pengutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).