The patch titled
Subject: rtc: bq32000: add trickle charger option, with device tree binding
has been added to the -mm tree. Its filename is
rtc-bq32000-add-trickle-charger-option-with-device-tree-binding.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/rtc-bq32000-add-trickle-charger-option-with-device-tree-binding.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/rtc-bq32000-add-trickle-charger-option-with-device-tree-binding.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Pavel Machek <pavel@xxxxxx>
Subject: rtc: bq32000: add trickle charger option, with device tree binding
BQ32000 devices have "trickle chargers". Introduce a code to enable the
charger, based on device tree.
Without charger, RTC does not keep time after power off.
Signed-off-by: Pavel Machek <pavel@xxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Matti Vaittinen <matti.vaittinen@xxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-bq32k.c | 65 ++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff -puN drivers/rtc/rtc-bq32k.c~rtc-bq32000-add-trickle-charger-option-with-device-tree-binding drivers/rtc/rtc-bq32k.c
--- a/drivers/rtc/rtc-bq32k.c~rtc-bq32000-add-trickle-charger-option-with-device-tree-binding
+++ a/drivers/rtc/rtc-bq32k.c
@@ -2,10 +2,14 @@
* Driver for TI BQ32000 RTC.
*
* Copyright (C) 2009 Semihalf.
+ * Copyright (C) 2014 Pavel Machek <pavel@xxxxxxx>
*
* 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
* published by the Free Software Foundation.
+ *
+ * You can get hardware description at
+ * http://www.ti.com/lit/ds/symlink/bq32000.pdf
*/
#include <linux/module.h>
@@ -27,6 +31,10 @@
#define BQ32K_CENT 0x40 /* Century flag */
#define BQ32K_CENT_EN 0x80 /* Century flag enable bit */
+#define BQ32K_CALIBRATION 0x07 /* CAL_CFG1, calibration and control */
+#define BQ32K_TCH2 0x08 /* Trickle charge enable */
+#define BQ32K_CFG2 0x09 /* Trickle charger control */
+
struct bq32k_regs {
uint8_t seconds;
uint8_t minutes;
@@ -122,6 +130,59 @@ static const struct rtc_class_ops bq32k_
.set_time = bq32k_rtc_set_time,
};
+static int trickle_charger_of_init(struct device *dev, struct device_node *node)
+{
+ int plen = 0;
+ const uint32_t *setup;
+ const uint32_t *reg;
+ int error;
+ u32 ohms = 0;
+
+ if (of_property_read_u32(node, "trickle-resistor-ohms" , &ohms))
+ return 0;
+
+ switch (ohms) {
+ case 180+940:
+ /*
+ * TCHE[3:0] == 0x05, TCH2 == 1, TCFE == 0 (charging
+ * over diode and 940ohm resistor)
+ */
+
+ if (of_property_read_bool(node, "trickle-diode-disable")) {
+ dev_err(dev, "diode and resistor mismatch\n");
+ return -EINVAL;
+ }
+ reg = 0x05;
+ break;
+
+ case 180+20000:
+ /* diode disabled */
+
+ if (!of_property_read_bool(node, "trickle-diode-disable")) {
+ dev_err(dev, "bq32k: diode and resistor mismatch\n");
+ return -EINVAL;
+ }
+ reg = 0x25;
+ break;
+
+ default:
+ dev_err(dev, "invalid resistor value (%d)\n", *setup);
+ return -EINVAL;
+ }
+
+ error = bq32k_write(dev, ®, BQ32K_CFG2, 1);
+ if (error)
+ return error;
+
+ reg = 0x20;
+ error = bq32k_write(dev, ®, BQ32K_TCH2, 1);
+ if (error)
+ return error;
+
+ dev_info(dev, "Enabled trickle RTC battery charge.\n");
+ return 0;
+}
+
static int bq32k_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -153,6 +214,10 @@ static int bq32k_probe(struct i2c_client
if (error)
return error;
+ if (client && client->dev.of_node) {
+ trickle_charger_of_init(dev, client->dev.of_node);
+ }
+
rtc = devm_rtc_device_register(&client->dev, bq32k_driver.driver.name,
&bq32k_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
_
Patches currently in -mm which might be from pavel@xxxxxx are
input-route-kbd-leds-through-the-generic-leds-layer.patch
lib-vsprintf-add-%pt-format-specifier.patch
rtc-bq32000-add-trickle-charger-option-with-device-tree-binding.patch
rtc-bq32000-add-trickle-charger-device-tree-binding.patch
linux-next.patch
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