Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 229 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-sd2405al.c b/drivers/rtc/rtc-sd2405al.c
new file mode 100644
index 000000000..7982a910a
--- /dev/null
+++ b/drivers/rtc/rtc-sd2405al.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RTC driver for the SD2405AL Real-Time Clock
+ *
+ * Datasheet:
+ * https://image.dfrobot.com/image/data/TOY0021/SD2405AL%20datasheet%20(Angelo%20v0.1).pdf
+ *
+ * I2C slave address: 0x32
+ *
+ * Copyright (C) 2024-2025 Tóth János <gomba007@gmail.com>
+ */
+
+#include <linux/bcd.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+
+/* Real time clock registers */
+#define SD2405AL_REG_T_SEC	0x00
+#define SD2405AL_REG_T_MIN	0x01
+#define SD2405AL_REG_T_HOUR	0x02
+#	define SD2405AL_BIT_12H_PM	BIT(5)
+#	define SD2405AL_BIT_24H		BIT(7)
+#define SD2405AL_REG_T_WEEK	0x03
+#define SD2405AL_REG_T_DAY	0x04
+#define SD2405AL_REG_T_MON	0x05
+#define SD2405AL_REG_T_YEAR	0x06
+
+#define SD2405AL_NUM_T_REGS	(SD2405AL_REG_T_YEAR - SD2405AL_REG_T_SEC + 1)
+
+/* Control registers */
+#define SD2405AL_REG_CTR1	0x0F
+#	define SD2405AL_BIT_WRTC2	BIT(2)
+#	define SD2405AL_BIT_WRTC3	BIT(7)
+#define SD2405AL_REG_CTR2	0x10
+#	define SD2405AL_BIT_WRTC1	BIT(7)
+#define SD2405AL_REG_CTR3	0x11
+#define SD2405AL_REG_TTF	0x12
+#define SD2405AL_REG_CNTDWN	0x13
+
+/* General RAM */
+#define SD2405AL_REG_M_START	0x14
+#define SD2405AL_REG_M_END	0x1F
+
+struct sd2405al {
+	struct device		*dev;
+	struct regmap		*regmap;
+};
+
+static int sd2405al_enable_reg_write(struct sd2405al *sd2405al)
+{
+	int ret;
+
+	/* order of writes is important */
+	ret = regmap_update_bits(sd2405al->regmap, SD2405AL_REG_CTR2,
+				 SD2405AL_BIT_WRTC1, SD2405AL_BIT_WRTC1);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_update_bits(sd2405al->regmap, SD2405AL_REG_CTR1,
+				 SD2405AL_BIT_WRTC2 | SD2405AL_BIT_WRTC3,
+				 SD2405AL_BIT_WRTC2 | SD2405AL_BIT_WRTC3);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int sd2405al_disable_reg_write(struct sd2405al *sd2405al)
+{
+	int ret;
+
+	/* order of writes is important */
+	ret = regmap_update_bits(sd2405al->regmap, SD2405AL_REG_CTR1,
+				 SD2405AL_BIT_WRTC2 | SD2405AL_BIT_WRTC3, 0x00);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_update_bits(sd2405al->regmap, SD2405AL_REG_CTR2,
+				 SD2405AL_BIT_WRTC1, 0x00);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int sd2405al_read_time(struct device *dev, struct rtc_time *time)
+{
+	u8 data[SD2405AL_NUM_T_REGS] = { 0 };
+	struct sd2405al *sd2405al = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regmap_bulk_read(sd2405al->regmap, SD2405AL_REG_T_SEC, data,
+			       SD2405AL_NUM_T_REGS);
+	if (ret < 0)
+		return ret;
+
+	time->tm_sec = bcd2bin(data[SD2405AL_REG_T_SEC] & 0x7F);
+	time->tm_min = bcd2bin(data[SD2405AL_REG_T_MIN] & 0x7F);
+
+	if (data[SD2405AL_REG_T_HOUR] & SD2405AL_BIT_24H)
+		time->tm_hour = bcd2bin(data[SD2405AL_REG_T_HOUR] & 0x3F);
+	else
+		if (data[SD2405AL_REG_T_HOUR] & SD2405AL_BIT_12H_PM)
+			time->tm_hour = bcd2bin(data[SD2405AL_REG_T_HOUR]
+						& 0x1F) + 12;
+		else /* 12 hour mode, AM */
+			time->tm_hour = bcd2bin(data[SD2405AL_REG_T_HOUR]
+						& 0x1F);
+
+	time->tm_wday = bcd2bin(data[SD2405AL_REG_T_WEEK] & 0x07);
+	time->tm_mday = bcd2bin(data[SD2405AL_REG_T_DAY] & 0x3F);
+	time->tm_mon = bcd2bin(data[SD2405AL_REG_T_MON] & 0x1F) - 1;
+	time->tm_year = bcd2bin(data[SD2405AL_REG_T_YEAR]) + 100;
+
+	dev_dbg(sd2405al->dev, "read time: %ptR (%d)\n", time, time->tm_wday);
+
+	return 0;
+}
+
+static int sd2405al_set_time(struct device *dev, struct rtc_time *time)
+{
+	u8 data[SD2405AL_NUM_T_REGS];
+	struct sd2405al *sd2405al = dev_get_drvdata(dev);
+	int ret;
+
+	data[SD2405AL_REG_T_SEC] = bin2bcd(time->tm_sec);
+	data[SD2405AL_REG_T_MIN] = bin2bcd(time->tm_min);
+	data[SD2405AL_REG_T_HOUR] = bin2bcd(time->tm_hour) | SD2405AL_BIT_24H;
+	data[SD2405AL_REG_T_DAY] = bin2bcd(time->tm_mday);
+	data[SD2405AL_REG_T_WEEK] = bin2bcd(time->tm_wday);
+	data[SD2405AL_REG_T_MON] = bin2bcd(time->tm_mon) + 1;
+	data[SD2405AL_REG_T_YEAR] = bin2bcd(time->tm_year - 100);
+
+	ret = sd2405al_enable_reg_write(sd2405al);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_write(sd2405al->regmap, SD2405AL_REG_T_SEC, data,
+				SD2405AL_NUM_T_REGS);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(sd2405al->regmap, SD2405AL_REG_TTF, 0x00);
+	if (ret < 0)
+		return ret;
+
+	ret = sd2405al_disable_reg_write(sd2405al);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(sd2405al->dev, "set time: %ptR (%d)\n", time, time->tm_wday);
+
+	return 0;
+}
+
+static const struct rtc_class_ops sd2405al_rtc_ops = {
+	.read_time = sd2405al_read_time,
+	.set_time = sd2405al_set_time,
+};
+
+static const struct regmap_config sd2405al_regmap_conf = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = SD2405AL_REG_M_END,
+};
+
+static int sd2405al_probe(struct i2c_client *client)
+{
+	struct sd2405al *sd2405al;
+	struct rtc_device *rtc;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -ENODEV;
+
+	sd2405al = devm_kzalloc(&client->dev, sizeof(*sd2405al), GFP_KERNEL);
+	if (!sd2405al)
+		return -ENOMEM;
+
+	sd2405al->dev = &client->dev;
+
+	sd2405al->regmap = devm_regmap_init_i2c(client, &sd2405al_regmap_conf);
+	if (IS_ERR(sd2405al->regmap))
+		return PTR_ERR(sd2405al->regmap);
+
+	rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
+	rtc->ops = &sd2405al_rtc_ops;
+	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	dev_set_drvdata(&client->dev, sd2405al);
+
+	ret = devm_rtc_register_device(rtc);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static const struct i2c_device_id sd2405al_id[] = {
+	{ .name = "sd2405al" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, sd2405al_id);
+
+static const __maybe_unused struct of_device_id sd2405al_of_match[] = {
+	{ .compatible = "dfrobot,sd2405al" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sd2405al_of_match);
+
+static struct i2c_driver sd2405al_driver = {
+	.driver = {
+		.name = "sd2405al",
+		.of_match_table = of_match_ptr(sd2405al_of_match),
+	},
+	.probe = sd2405al_probe,
+	.id_table = sd2405al_id,
+};
+
+module_i2c_driver(sd2405al_driver);
+
+MODULE_AUTHOR("Tóth János <gomba007@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SD2405AL RTC driver");