linux-kernel - [PATCH 04/10] rtc: pcf2127: adapt for WD registers at any offset

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Message-Id: <20220125200009.900660-5-hugo@hugovil.com>
Date:   Tue, 25 Jan 2022 15:00:03 -0500
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     hugo@...ovil.com, Hugo Villeneuve <hvilleneuve@...onoff.com>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/10] rtc: pcf2127: adapt for WD registers at any offset

From: Hugo Villeneuve <hvilleneuve@...onoff.com>

This will simplify the implementation of new variants into this driver.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
 drivers/rtc/rtc-pcf2127.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 7a13a34eb21b..82e4af999c29 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -114,6 +114,8 @@ struct pcf21xx_config {
 	unsigned int has_bit_wd_ctl_cd0:1;
 	u8 regs_td_base; /* Time/data base registers. */
 	u8 regs_alarm_base; /* Alarm function base registers. */
+	u8 reg_wd_ctl; /* Watchdog control register. */
+	u8 reg_wd_val; /* Watchdog value register. */
 };
 
 struct pcf2127 {
@@ -297,7 +299,7 @@ static int pcf2127_wdt_ping(struct watchdog_device *wdd)
 {
 	struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
 
-	return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL, wdd->timeout);
+	return regmap_write(pcf2127->regmap, pcf2127->cfg->reg_wd_val, wdd->timeout);
 }
 
 /*
@@ -331,7 +333,7 @@ static int pcf2127_wdt_stop(struct watchdog_device *wdd)
 {
 	struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
 
-	return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL,
+	return regmap_write(pcf2127->regmap, pcf2127->cfg->reg_wd_val,
 			    PCF2127_WD_VAL_STOP);
 }
 
@@ -380,7 +382,7 @@ static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
 	watchdog_set_drvdata(&pcf2127->wdd, pcf2127);
 
 	/* Test if watchdog timer is started by bootloader */
-	ret = regmap_read(pcf2127->regmap, PCF2127_REG_WD_VAL, &wdd_timeout);
+	ret = regmap_read(pcf2127->regmap, pcf2127->cfg->reg_wd_val, &wdd_timeout);
 	if (ret)
 		return ret;
 
@@ -663,6 +665,8 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
 		.has_bit_wd_ctl_cd0 = 1,
 		.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
 		.regs_alarm_base = PCF2127_REG_ALARM_BASE,
+		.reg_wd_ctl = PCF2127_REG_WD_CTL,
+		.reg_wd_val = PCF2127_REG_WD_VAL,
 	},
 	[PCF2129] = {
 		.max_register = 0x19,
@@ -670,6 +674,8 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
 		.has_bit_wd_ctl_cd0 = 0,
 		.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
 		.regs_alarm_base = PCF2127_REG_ALARM_BASE,
+		.reg_wd_ctl = PCF2127_REG_WD_CTL,
+		.reg_wd_val = PCF2127_REG_WD_VAL,
 	},
 };
 
@@ -759,7 +765,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 	 * as T. Bits labeled as T must always be written with
 	 * logic 0.
 	 */
-	ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
+	ret = regmap_update_bits(pcf2127->regmap, pcf2127->cfg->reg_wd_ctl,
 				 PCF2127_BIT_WD_CTL_CD1 |
 				 PCF2127_BIT_WD_CTL_CD0 |
 				 PCF2127_BIT_WD_CTL_TF1 |
-- 
2.30.2