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Wed, 16 Sep 2026 13:53:40 -0700 (PDT) From: Antoni Pokusinski To: alexandre.belloni@bootlin.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Antoni Pokusinski Subject: [PATCH v7 9/9] rtc: abx80x: add support for ABX81X Date: Wed, 16 Sep 2026 22:51:38 +0200 Message-ID: <20260916205138.16771-10-apokusinski01@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260916205138.16771-1-apokusinski01@gmail.com> References: <20260916205138.16771-1-apokusinski01@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Abracon ABX81X is a family of RTCs with SPI interface featuring the same functionalities as the ABX80X I2C clocks. Signed-off-by: Antoni Pokusinski --- drivers/rtc/Kconfig | 26 +++++----- drivers/rtc/rtc-abx80x.c | 106 +++++++++++++++++++++++++++++++++++++-- 2 files changed, 115 insertions(+), 17 deletions(-) diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 4d14bcba616e..d35221f81024 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -212,18 +212,6 @@ config RTC_DRV_ABEOZ9 This driver can also be built as a module. If so, the module will be called rtc-ab-e0z9. -config RTC_DRV_ABX80X - tristate "Abracon ABx80x" - select WATCHDOG_CORE if WATCHDOG - select REGMAP_I2C - help - If you say yes here you get support for Abracon AB080X and AB180X - families of ultra-low-power battery- and capacitor-backed real-time - clock chips. - - This driver can also be built as a module. If so, the module - will be called rtc-abx80x. - config RTC_DRV_AC100 tristate "X-Powers AC100" depends on MFD_AC100 @@ -955,6 +943,20 @@ config RTC_I2C_AND_SPI comment "SPI and I2C RTC drivers" +config RTC_DRV_ABX80X + tristate "Abracon ABx80x" + depends on RTC_I2C_AND_SPI + select WATCHDOG_CORE if WATCHDOG + select REGMAP_I2C if I2C + select REGMAP_SPI if SPI_MASTER + help + If you say yes here you get support for Abracon AB080X, AB180X, + AB081X and AB181X families of ultra-low-power battery- and + capacitor-backed real-time clock chips. + + This driver can also be built as a module. If so, the module + will be called rtc-abx80x. + config RTC_DRV_DS3232 tristate "Dallas/Maxim DS3232/DS3234" depends on RTC_I2C_AND_SPI diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c index 3f0f8d7f8761..718e6b8555f5 100644 --- a/drivers/rtc/rtc-abx80x.c +++ b/drivers/rtc/rtc-abx80x.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* - * A driver for the I2C members of the Abracon AB x8xx RTC family, - * and compatible: AB 1805 and AB 0805 + * A driver for the I2C and SPI members of the Abracon AB x8xx RTC family, + * and compatible: AB 1805, AB 0805, AB 1815 and AB 0815 * * Copyright 2014-2015 Macq S.A. * @@ -19,6 +19,7 @@ #include #include #include +#include #include #define ABX8XX_REG_HTH 0x00 @@ -109,8 +110,8 @@ static u8 trickle_resistors[] = {0, 3, 6, 11}; -enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, - AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X}; +enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, AB0815, + AB1801, AB1803, AB1804, AB1805, AB1815, RV1805, ABX80X}; struct abx80x_cap { u16 pn; @@ -123,10 +124,12 @@ static struct abx80x_cap abx80x_caps[] = { [AB0803] = {.pn = 0x0803}, [AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true}, [AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true}, + [AB0815] = {.pn = 0x0815, .has_tc = true, .has_wdog = true}, [AB1801] = {.pn = 0x1801}, [AB1803] = {.pn = 0x1803}, [AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true}, [AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, + [AB1815] = {.pn = 0x1815, .has_tc = true, .has_wdog = true}, [RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, [ABX80X] = {.pn = 0} }; @@ -1076,14 +1079,107 @@ static void abx80x_unregister_driver(void) #endif /* IS_ENABLED(CONFIG_I2C) */ +#if IS_ENABLED(CONFIG_SPI_MASTER) + +static const struct regmap_config abx80x_regmap_config_spi = { + .reg_bits = 8, + .val_bits = 8, + .max_register = ABX8XX_SRAM_BASE + ABX8XX_SRAM_WIN_SIZE - 1, + + .rd_table = &abx80x_read_table, + .wr_table = &abx80x_write_table, + + .write_flag_mask = BIT(7), +}; + +static const struct spi_device_id abx81x_id[] = { + { "ab0815", AB0815 }, + { "ab1815", AB1815 }, + { } +}; +MODULE_DEVICE_TABLE(spi, abx81x_id); + +#ifdef CONFIG_OF +static const struct of_device_id abx81x_of_match[] = { + { + .compatible = "abracon,ab0815", + .data = (void *)AB0815 + }, + { + .compatible = "abracon,ab1815", + .data = (void *)AB1815 + }, + { } +}; +MODULE_DEVICE_TABLE(of, abx81x_of_match); +#endif + +static int abx81x_spi_probe(struct spi_device *spi) +{ + unsigned int part = (uintptr_t)spi_get_device_match_data(spi); + struct regmap *regmap; + + regmap = devm_regmap_init_spi(spi, &abx80x_regmap_config_spi); + if (IS_ERR(regmap)) { + dev_err(&spi->dev, "Unable to allocate regmap\n"); + return PTR_ERR(regmap); + } + + return abx80x_probe(&spi->dev, regmap, spi->irq, + spi->dev.of_node, part); +} + +static struct spi_driver abx81x_driver = { + .driver = { + .name = "rtc-abx81x", + .of_match_table = of_match_ptr(abx81x_of_match), + }, + .probe = abx81x_spi_probe, + .id_table = abx81x_id, +}; + +static int abx81x_register_driver(void) +{ + return spi_register_driver(&abx81x_driver); +} + +static void abx81x_unregister_driver(void) +{ + spi_unregister_driver(&abx81x_driver); +} + +#else + +static int abx81x_register_driver(void) +{ + return 0; +} + +static void abx81x_unregister_driver(void) +{ +} + +#endif /* IS_ENABLED(CONFIG_SPI_MASTER) */ + static int __init abx80x_init(void) { - return abx80x_register_driver(); + int ret; + + ret = abx80x_register_driver(); + if (ret) + return ret; + + ret = abx81x_register_driver(); + if (ret) + abx80x_unregister_driver(); + + return ret; } module_init(abx80x_init); static void __exit abx80x_exit(void) { + abx81x_unregister_driver(); abx80x_unregister_driver(); } module_exit(abx80x_exit); -- 2.55.0