rtc: rv3029: update to support DM and sync with Linux 4.17
authorPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tue, 27 Nov 2018 21:53:58 +0000 (22:53 +0100)
committerPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Fri, 30 Nov 2018 20:56:45 +0000 (21:56 +0100)
The "Flamingo" carrier-board for the RK3399-Q7 has a RV3029 populated
and the application will use the off-module RV3029 RTC including the
battery backed SRAM.

To support this use case, this commit includes the following changes:
 * updates the rv3029 driver to use DM
 * implements the read8/write8 operations

This syncs the implementation with the Linux code (based on 4.17),
porting the trickle-charger support from there (with improvements to
avoid unnecessary EEPROM updates) and adheres to the Linux DTS
binding.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
drivers/rtc/rv3029.c
scripts/config_whitelist.txt

index dd4d0607a8f77ea71b7888c8ccc6f38b465f1e4a..38acb9c9924d13015ab25ca23ea646cbcbc326ee 100644 (file)
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * (C) Copyright 2010
- * Heiko Schocher, DENX Software Engineering, hs@denx.de
+ * (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
+ *
+ * Based on a the Linux rtc-rv3029c2.c driver written by:
+ *   Gregory Hermant <gregory.hermant@calao-systems.com>
+ *   Michael Buesch <m@bues.ch>
  */
+
 #include <common.h>
 #include <command.h>
+#include <dm.h>
 #include <i2c.h>
 #include <rtc.h>
 
-#define RTC_RV3029_CTRL1       0x00
-#define RTC_RV3029_CTRL1_EERE  (1 << 3)
-
-#define RTC_RV3029_CTRL_STATUS 0x03
-#define RTC_RV3029_CTRLS_EEBUSY        (1 << 7)
+#define RTC_RV3029_PAGE_LEN             7
 
-#define RTC_RV3029_CTRL_RESET  0x04
-#define RTC_RV3029_CTRL_SYS_R  (1 << 4)
+/* control section */
+#define RV3029_ONOFF_CTRL              0x00
+#define RV3029_ONOFF_CTRL_WE           BIT(0)
+#define RV3029_ONOFF_CTRL_TE           BIT(1)
+#define RV3029_ONOFF_CTRL_TAR          BIT(2)
+#define RV3029_ONOFF_CTRL_EERE         BIT(3)
+#define RV3029_ONOFF_CTRL_SRON         BIT(4)
+#define RV3029_ONOFF_CTRL_TD0          BIT(5)
+#define RV3029_ONOFF_CTRL_TD1          BIT(6)
+#define RV3029_ONOFF_CTRL_CLKINT       BIT(7)
+#define RV3029_IRQ_CTRL                        0x01
+#define RV3029_IRQ_CTRL_AIE            BIT(0)
+#define RV3029_IRQ_CTRL_TIE            BIT(1)
+#define RV3029_IRQ_CTRL_V1IE           BIT(2)
+#define RV3029_IRQ_CTRL_V2IE           BIT(3)
+#define RV3029_IRQ_CTRL_SRIE           BIT(4)
+#define RV3029_IRQ_FLAGS               0x02
+#define RV3029_IRQ_FLAGS_AF            BIT(0)
+#define RV3029_IRQ_FLAGS_TF            BIT(1)
+#define RV3029_IRQ_FLAGS_V1IF          BIT(2)
+#define RV3029_IRQ_FLAGS_V2IF          BIT(3)
+#define RV3029_IRQ_FLAGS_SRF           BIT(4)
+#define RV3029_STATUS                  0x03
+#define RV3029_STATUS_VLOW1            BIT(2)
+#define RV3029_STATUS_VLOW2            BIT(3)
+#define RV3029_STATUS_SR               BIT(4)
+#define RV3029_STATUS_PON              BIT(5)
+#define RV3029_STATUS_EEBUSY           BIT(7)
+#define RV3029_RST_CTRL                        0x04
+#define RV3029_RST_CTRL_SYSR           BIT(4)
+#define RV3029_CONTROL_SECTION_LEN     0x05
 
-#define RTC_RV3029_CLOCK_PAGE  0x08
-#define RTC_RV3029_PAGE_LEN    7
+/* watch section */
+#define RV3029_W_SEC                   0x08
+#define RV3029_W_MINUTES               0x09
+#define RV3029_W_HOURS                 0x0A
+#define RV3029_REG_HR_12_24            BIT(6) /* 24h/12h mode */
+#define RV3029_REG_HR_PM               BIT(5) /* PM/AM bit in 12h mode */
+#define RV3029_W_DATE                  0x0B
+#define RV3029_W_DAYS                  0x0C
+#define RV3029_W_MONTHS                        0x0D
+#define RV3029_W_YEARS                 0x0E
 
-#define RV3029C2_W_SECONDS     0x00
-#define RV3029C2_W_MINUTES     0x01
-#define RV3029C2_W_HOURS       0x02
-#define RV3029C2_W_DATE                0x03
-#define RV3029C2_W_DAYS                0x04
-#define RV3029C2_W_MONTHS      0x05
-#define RV3029C2_W_YEARS       0x06
+/* eeprom control section */
+#define RV3029_CONTROL_E2P_EECTRL      0x30
+#define RV3029_TRICKLE_1K              BIT(4) /* 1.5K resistance */
+#define RV3029_TRICKLE_5K              BIT(5) /* 5K   resistance */
+#define RV3029_TRICKLE_20K             BIT(6) /* 20K  resistance */
+#define RV3029_TRICKLE_80K             BIT(7) /* 80K  resistance */
+#define RV3029_TRICKLE_MASK            (RV3029_TRICKLE_1K |\
+                                        RV3029_TRICKLE_5K |\
+                                        RV3029_TRICKLE_20K |\
+                                        RV3029_TRICKLE_80K)
+#define RV3029_TRICKLE_SHIFT           4
 
-#define RV3029C2_REG_HR_12_24          (1 << 6)  /* 24h/12h mode */
-#define RV3029C2_REG_HR_PM             (1 << 5)  /* PM/AM bit in 12h mode */
 
-#define RTC_RV3029_EEPROM_CTRL 0x30
-#define RTC_RV3029_TRICKLE_1K  (1 << 4)
-#define RTC_RV3029_TRICKLE_5K  (1 << 5)
-#define RTC_RV3029_TRICKLE_20K (1 << 6)
-#define RTC_RV3029_TRICKLE_80K (1 << 7)
-
-int rtc_get( struct rtc_time *tmp )
+static int rv3029_rtc_get(struct udevice *dev, struct rtc_time *tm)
 {
-       int     ret;
-       unsigned char buf[RTC_RV3029_PAGE_LEN];
+       u8 regs[RTC_RV3029_PAGE_LEN];
+       int ret;
 
-       ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \
-                       RTC_RV3029_PAGE_LEN);
-       if (ret) {
+       ret = dm_i2c_read(dev, RV3029_W_SEC, regs, sizeof(regs));
+       if (ret < 0) {
                printf("%s: error reading RTC: %x\n", __func__, ret);
-               return -1;
+               return -EIO;
+       }
+
+       tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
+       tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
+
+       /* HR field has a more complex interpretation */
+       {
+               const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
+
+               if (_hr & RV3029_REG_HR_12_24) {
+                       /* 12h format */
+                       tm->tm_hour = bcd2bin(_hr & 0x1f);
+                       if (_hr & RV3029_REG_HR_PM)     /* PM flag set */
+                               tm->tm_hour += 12;
+               } else {
+                       /* 24h format */
+                       tm->tm_hour = bcd2bin(_hr & 0x3f);
+               }
        }
-       tmp->tm_sec  = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f);
-       tmp->tm_min  = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f);
-       if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) {
-               /* 12h format */
-               tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f);
-               if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM)
-                       /* PM flag set */
-                       tmp->tm_hour += 12;
-       } else
-               tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f);
-
-       tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F );
-       tmp->tm_mon  = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F );
-       tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 );
+
+       tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
+       tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
        /* RTC supports only years > 1999 */
-       tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000;
-       tmp->tm_yday = 0;
-       tmp->tm_isdst = 0;
+       tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 2000;
+       tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
+
+       tm->tm_yday = 0;
+       tm->tm_isdst = 0;
 
-       debug( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
-               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
-               tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
+       debug("%s: %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n",
+             __func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
+             tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 
        return 0;
 }
 
-int rtc_set( struct rtc_time *tmp )
+static int rv3029_rtc_set(struct udevice *dev, const struct rtc_time *tm)
 {
-       int     ret;
-       unsigned char buf[RTC_RV3029_PAGE_LEN];
+       u8 regs[RTC_RV3029_PAGE_LEN];
+
+       debug("%s: %4d-%02d-%02d (wday=%d( %2d:%02d:%02d\n",
+             __func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
+             tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 
-       debug( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
-               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
-               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 
-       if (tmp->tm_year < 2000) {
-               printf("RTC: year %d < 2000 not possible\n", tmp->tm_year);
-               return -1;
+       if (tm->tm_year < 2000) {
+               printf("%s: year %d (before 2000) not supported\n",
+                      __func__, tm->tm_year);
+               return -EINVAL;
        }
-       buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec);
-       buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min);
-       buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour);
-       /* set 24h format */
-       buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24;
-       buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday);
-       buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday);
-       buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon);
-       tmp->tm_year -= 2000;
-       buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year);
-       ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1,
-                       buf, RTC_RV3029_PAGE_LEN);
-
-       /* give the RTC some time to update */
-       udelay(1000);
-       return ret;
+
+       regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
+       regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
+       regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
+       regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
+       regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
+       regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
+       regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 2000);
+
+       return dm_i2c_write(dev, RV3029_W_SEC, regs, sizeof(regs));
 }
 
-/* sets EERE-Bit  (automatic EEPROM refresh) */
-static void set_eere_bit(int state)
+static int rv3029_rtc_reset(struct udevice *dev)
 {
-       unsigned char reg_ctrl1;
+       u8 ctrl = RV3029_RST_CTRL_SYSR;
+       unsigned long start;
+       const unsigned long timeout_ms = 10000;
+       int ret;
 
-       (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1,
-                       &reg_ctrl1, 1);
+       /* trigger the system-reset */
+       ret = dm_i2c_write(dev, RV3029_RST_CTRL, &ctrl, 1);
+       if (ret < 0)
+               return -EIO;
 
-       if (state)
-               reg_ctrl1 |= RTC_RV3029_CTRL1_EERE;
-       else
-               reg_ctrl1 &= (~RTC_RV3029_CTRL1_EERE);
+       /* wait for the system-reset to complete */
+       start = get_timer(0);
+       do {
+               if (get_timer(start) > timeout_ms)
+                       return -ETIMEDOUT;
 
-       (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1,
-               &reg_ctrl1, 1);
+               ret = dm_i2c_read(dev, RV3029_RST_CTRL, &ctrl, 1);
+               if (ret < 0)
+                       return -EIO;
+       } while (ctrl & RV3029_RST_CTRL_SYSR);
+
+       return 0;
 }
 
-/* waits until EEPROM page is no longer busy (times out after 10ms*loops) */
-static int wait_eebusy(int loops)
+static int rv3029_rtc_read8(struct udevice *dev, unsigned int reg)
 {
-       int i;
-       unsigned char ctrl_status;
+       u8 data;
+       int ret;
+
+       ret = dm_i2c_read(dev, reg, &data, sizeof(data));
+       return ret < 0 ? ret : data;
+}
 
-       for (i = 0; i < loops; i++) {
-               (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_STATUS,
-                       1, &ctrl_status, 1);
+static int rv3029_rtc_write8(struct udevice *dev, unsigned int reg, int val)
+{
+       u8 data = val;
+
+       return dm_i2c_write(dev, reg, &data, 1);
+}
+
+#if defined(OF_CONTROL)
+static int rv3029_get_sr(struct udevice *dev, u8 *buf)
+{
+       int ret = dm_i2c_read(dev, RV3029_STATUS, buf, 1);
+
+       if (ret < 0)
+               return -EIO;
+
+       dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
+       return 0;
+}
 
-               if ((ctrl_status & RTC_RV3029_CTRLS_EEBUSY) == 0)
+static int rv3029_set_sr(struct udevice *dev, u8 val)
+{
+       int ret;
+
+       ret = dm_i2c_read(dev, RV3029_STATUS, &val, 1);
+       if (ret < 0)
+               return -EIO;
+
+       dev_dbg(dev, "status = 0x%.2x (%d)\n", val, val);
+       return 0;
+}
+
+static int rv3029_eeprom_busywait(struct udevice *dev)
+{
+       int i, ret;
+       u8 sr;
+
+       for (i = 100; i > 0; i--) {
+               ret = rv3029_get_sr(dev, &sr);
+               if (ret < 0)
+                       break;
+               if (!(sr & RV3029_STATUS_EEBUSY))
                        break;
                udelay(10000);
        }
-       return i;
+       if (i <= 0) {
+               dev_err(dev, "EEPROM busy wait timeout.\n");
+               return -ETIMEDOUT;
+       }
+
+       return ret;
 }
 
-void rtc_reset (void)
+static int rv3029_update_bits(struct udevice *dev, u8 reg, u8 mask, u8 set)
 {
-       unsigned char buf[RTC_RV3029_PAGE_LEN];
+       u8 buf;
+       int ret;
 
-       buf[0] = RTC_RV3029_CTRL_SYS_R;
-       (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1,
-                       buf, 1);
+       ret = dm_i2c_read(dev, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
 
-#if defined(CONFIG_SYS_RV3029_TCR)
-       /*
-        * because EEPROM_CTRL register is in EEPROM page it is necessary to
-        * disable automatic EEPROM refresh and check if EEPROM is busy
-        * before EEPORM_CTRL register may be accessed
-        */
-       set_eere_bit(0);
-       wait_eebusy(100);
-       /* read current trickle charger setting */
-       (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_EEPROM_CTRL,
-                       1, buf, 1);
-       /* enable automatic EEPROM refresh again */
-       set_eere_bit(1);
+       if ((buf & mask) == (set && mask))
+               return 0;
 
-       /*
-        * to minimize EEPROM access write trickle charger setting only if it
-        * differs from current value
-        */
-       if ((buf[0] & 0xF0) != CONFIG_SYS_RV3029_TCR) {
-               buf[0] = (buf[0] & 0x0F) | CONFIG_SYS_RV3029_TCR;
-               /*
-                * write trickle charger setting (disable autom. EEPROM
-                * refresh and wait until EEPROM is idle)
-                */
-               set_eere_bit(0);
-               wait_eebusy(100);
-               (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR,
-                               RTC_RV3029_EEPROM_CTRL, 1, buf, 1);
-               /*
-                * it is necessary to wait 10ms before EEBUSY-Bit may be read
-                * (this is not documented in the data sheet yet, but the
-                * manufacturer recommends it)
+       buf = (buf & ~mask) | (set & mask);
+       ret = dm_i2c_read(dev, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static int rv3029_eeprom_exit(struct udevice *dev)
+{
+       /* Re-enable eeprom refresh */
+       return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
+                                 RV3029_ONOFF_CTRL_EERE,
+                                 RV3029_ONOFF_CTRL_EERE);
+}
+
+static int rv3029_eeprom_enter(struct udevice *dev)
+{
+       int ret;
+       u8 sr;
+
+       /* Check whether we are in the allowed voltage range. */
+       ret = rv3029_get_sr(dev, &sr);
+       if (ret < 0)
+               return ret;
+       if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
+               /* We clear the bits and retry once just in case
+                * we had a brown out in early startup.
                 */
+               sr &= ~RV3029_STATUS_VLOW1;
+               sr &= ~RV3029_STATUS_VLOW2;
+               ret = rv3029_set_sr(dev, sr);
+               if (ret < 0)
+                       return ret;
                udelay(10000);
-               /* wait until EEPROM write access is finished */
-               wait_eebusy(100);
-               set_eere_bit(1);
+               ret = rv3029_get_sr(dev, &sr);
+               if (ret < 0)
+                       return ret;
+               if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
+                       dev_err(dev, "Supply voltage is too low to safely access the EEPROM.\n");
+                       return -ENODEV;
+               }
+       }
+
+       /* Disable eeprom refresh. */
+       ret = rv3029_update_bits(dev,
+                                RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE, 0);
+       if (ret < 0)
+               return ret;
+
+       /* Wait for any previous eeprom accesses to finish. */
+       ret = rv3029_eeprom_busywait(dev);
+       if (ret < 0)
+               rv3029_eeprom_exit(dev);
+
+       return ret;
+}
+
+static int rv3029_eeprom_read(struct udevice *dev, u8 reg,
+                             u8 buf[], size_t len)
+{
+       int ret, err;
+
+       err = rv3029_eeprom_enter(dev);
+       if (err < 0)
+               return err;
+
+       ret = dm_i2c_read(dev, reg, buf, len);
+
+       err = rv3029_eeprom_exit(dev);
+       if (err < 0)
+               return err;
+
+       return ret;
+}
+
+static int rv3029_eeprom_write(struct udevice *dev, u8 reg,
+                              u8 const buf[], size_t len)
+{
+       int ret;
+       size_t i;
+       u8 tmp;
+
+       ret = rv3029_eeprom_enter(dev);
+       if (ret < 0)
+               return ret;
+
+       for (i = 0; i < len; i++, reg++) {
+               ret = dm_i2c_read(dev, reg, &tmp, 1);
+               if (ret < 0)
+                       break;
+               if (tmp != buf[i]) {
+                       ret = dm_i2c_write(dev, reg, &buf[i], 1);
+                       if (ret < 0)
+                               break;
+               }
+               ret = rv3029_eeprom_busywait(dev);
+               if (ret < 0)
+                       break;
        }
+
+       ret = rv3029_eeprom_exit(dev);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static int rv3029_eeprom_update_bits(struct udevice *dev,
+                                    u8 reg, u8 mask, u8 set)
+{
+       u8 buf;
+       int ret;
+
+       ret = rv3029_eeprom_read(dev, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
+
+       /*
+        * If the EEPROM already reads the correct bitpattern, we don't need
+        * to update it.
+        */
+       if ((buf & mask) == (set & mask))
+               return 0;
+
+       buf = (buf & ~mask) | (set & mask);
+       ret = rv3029_eeprom_write(dev, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static void rv3029_trickle_config(struct udevice *dev)
+{
+       static const struct rv3029_trickle_tab_elem {
+               u32 r;          /* resistance in ohms */
+               u8 conf;        /* trickle config bits */
+       } rv3029_trickle_tab[] = {
+               {
+                       .r      = 1076,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+                                 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 1091,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+                                 RV3029_TRICKLE_20K,
+               }, {
+                       .r      = 1137,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+                                 RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 1154,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
+               }, {
+                       .r      = 1371,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
+                                 RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 1395,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
+               }, {
+                       .r      = 1472,
+                       .conf   = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 1500,
+                       .conf   = RV3029_TRICKLE_1K,
+               }, {
+                       .r      = 3810,
+                       .conf   = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
+                                 RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 4000,
+                       .conf   = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
+               }, {
+                       .r      = 4706,
+                       .conf   = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 5000,
+                       .conf   = RV3029_TRICKLE_5K,
+               }, {
+                       .r      = 16000,
+                       .conf   = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+               }, {
+                       .r      = 20000,
+                       .conf   = RV3029_TRICKLE_20K,
+               }, {
+                       .r      = 80000,
+                       .conf   = RV3029_TRICKLE_80K,
+               },
+       };
+       int err;
+       u32 ohms;
+       u8 trickle_set_bits = 0;
+
+       /* Configure the trickle charger. */
+       err = dev_read_u32(dev, "trickle-resistor-ohms", &ohms);
+
+       if (!err) {
+               /* Find trickle-charger config */
+               for (int i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++)
+                       if (rv3029_trickle_tab[i].r >= ohms) {
+                               dev_dbg(dev, "trickle charger at %d ohms\n",
+                                       rv3029_trickle_tab[i].r);
+                               trickle_set_bits = rv3029_trickle_tab[i].conf;
+                               break;
+                       }
+       }
+
+       dev_dbg(dev, "trickle charger config 0x%x\n", trickle_set_bits);
+       err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
+                                       RV3029_TRICKLE_MASK,
+                                       trickle_set_bits);
+       if (err < 0)
+               dev_dbg(dev, "failed to update trickle charger\n");
+}
+#else
+static inline void rv3029_trickle_config(struct udevice *dev)
+{
+}
 #endif
+
+static int rv3029_probe(struct udevice *dev)
+{
+       i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
+                               DM_I2C_CHIP_WR_ADDRESS);
+
+       rv3029_trickle_config(dev);
+       return 0;
 }
+
+static const struct rtc_ops rv3029_rtc_ops = {
+       .get = rv3029_rtc_get,
+       .set = rv3029_rtc_set,
+       .read8 = rv3029_rtc_read8,
+       .write8 = rv3029_rtc_write8,
+       .reset = rv3029_rtc_reset,
+};
+
+static const struct udevice_id rv3029_rtc_ids[] = {
+       { .compatible = "mc,rv3029" },
+       { .compatible = "mc,rv3029c2" },
+       { }
+};
+
+U_BOOT_DRIVER(rtc_rv3029) = {
+       .name   = "rtc-rv3029",
+       .id     = UCLASS_RTC,
+       .probe  = rv3029_probe,
+       .of_match = rv3029_rtc_ids,
+       .ops    = &rv3029_rtc_ops,
+};
index 69bef5e6dadb3ad06be972e1fc920fd23512a165..b3f525fc02c7a71fd199102bfc6a687a07cfd675 100644 (file)
@@ -4054,7 +4054,6 @@ CONFIG_SYS_RTC_CNT
 CONFIG_SYS_RTC_OSCILLATOR
 CONFIG_SYS_RTC_REG_BASE_ADDR
 CONFIG_SYS_RTC_SETUP
-CONFIG_SYS_RV3029_TCR
 CONFIG_SYS_RX_ETH_BUFFER
 CONFIG_SYS_SATA
 CONFIG_SYS_SATA1