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rtc: pcf85063: add Micro Crystal RV8263 support 

The Micro Crystal RV8263 has the same IC as the pcf85063 but has an on
board crystal. This means that the CAP_SEL bit has to be cleared so the
correct capacitance is selected for the crystal.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
hifive-unleashed-5.2
Alexandre Belloni 2019-04-01 18:08:13 +02:00
parent 05cb3a56ee
commit 5b3a3ade02
2 changed files with 30 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt
View File

@ -4,7 +4,8 @@ Required properties:
- compatible: Should one of contain:
"nxp,pcf85063",
"nxp,pcf85063a",
"nxp,pcf85063tp"
"nxp,pcf85063tp",
"microcrystal,rv8263"
- reg: I2C address for chip.
Optional property:

32
drivers/rtc/rtc-pcf85063.c
View File

@ -5,6 +5,9 @@
*
* Author: Søren Andersen <san@rosetechnology.dk>
* Maintainers: http://www.nslu2-linux.org/
*
* Copyright (C) 2019 Micro Crystal AG
* Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
*/
#include <linux/i2c.h>
#include <linux/bcd.h>
@ -22,7 +25,10 @@
*
* PCF85063A -- Rev. 6 — 18 November 2015
* PCF85063TP -- Rev. 4 — 6 May 2015
*/
*
* https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8263-C7_App-Manual.pdf
* RV8263 -- Rev. 1.0 — January 2019
*/
#define PCF85063_REG_CTRL1 0x00 /* status */
#define PCF85063_REG_CTRL1_CAP_SEL BIT(0)
@ -41,6 +47,7 @@
struct pcf85063_config {
struct regmap_config regmap;
unsigned has_alarms:1;
unsigned force_cap_7000:1;
};
struct pcf85063 {
@ -230,12 +237,17 @@ static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
};
static int pcf85063_load_capacitance(struct pcf85063 *pcf85063,
const struct device_node *np)
const struct device_node *np,
unsigned int force_cap)
{
u32 load = 7000;
u8 reg = 0;
of_property_read_u32(np, "quartz-load-femtofarads", &load);
if (force_cap)
load = force_cap;
else
of_property_read_u32(np, "quartz-load-femtofarads", &load);
switch (load) {
default:
dev_warn(&pcf85063->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
@ -269,6 +281,16 @@ static const struct pcf85063_config pcf85063tp_config = {
},
};
static const struct pcf85063_config rv8263_config = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x11,
},
.has_alarms = 1,
.force_cap_7000 = 1,
};
static int pcf85063_probe(struct i2c_client *client)
{
struct pcf85063 *pcf85063;
@ -303,7 +325,8 @@ static int pcf85063_probe(struct i2c_client *client)
if (IS_ERR(pcf85063->rtc))
return PTR_ERR(pcf85063->rtc);
err = pcf85063_load_capacitance(pcf85063, client->dev.of_node);
err = pcf85063_load_capacitance(pcf85063, client->dev.of_node,
config->force_cap_7000 ? 7000 : 0);
if (err < 0)
dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
err);
@ -339,6 +362,7 @@ static const struct of_device_id pcf85063_of_match[] = {
{ .compatible = "nxp,pcf85063", .data = &pcf85063tp_config },
{ .compatible = "nxp,pcf85063tp", .data = &pcf85063tp_config },
{ .compatible = "nxp,pcf85063a", .data = &pcf85063a_config },
{ .compatible = "microcrystal,rv8263", .data = &rv8263_config },
{}
};
MODULE_DEVICE_TABLE(of, pcf85063_of_match);