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path: root/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch
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-rw-r--r--target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch441
1 files changed, 166 insertions, 275 deletions
diff --git a/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch
index 21872082dd..31854eff4b 100644
--- a/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch
+++ b/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch
@@ -45,13 +45,12 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+};
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
-@@ -806,6 +806,11 @@ config I2C_RK3X
+@@ -806,6 +806,10 @@ config I2C_RK3X
This driver can also be built as a module. If so, the module will
be called i2c-rk3x.
+config I2C_RALINK
+ tristate "Ralink I2C Controller"
-+ depends on RALINK && !SOC_MT7621
+ select OF_I2C
+
config HAVE_S3C2410_I2C
@@ -69,12 +68,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ralink.c
-@@ -0,0 +1,435 @@
+@@ -0,0 +1,327 @@
+/*
+ * drivers/i2c/busses/i2c-ralink.c
+ *
+ * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.com>
-+ * Copyright (C) 2016 Michael Lee <igvtee@gmail.com>
+ *
+ * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus.
+ * (C) 2014 Sittisak <sittisaks@hotmail.com>
@@ -103,7 +101,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/err.h>
-+#include <linux/clk.h>
++
++#include <asm/mach-ralink/ralink_regs.h>
+
+#define REG_CONFIG_REG 0x00
+#define REG_CLKDIV_REG 0x04
@@ -114,250 +113,191 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define REG_STATUS_REG 0x18
+#define REG_STARTXFR_REG 0x1C
+#define REG_BYTECNT_REG 0x20
++#define REG_SM0CFG2 0x28
++#define REG_SM0CTL0 0x40
+
-+/* REG_CONFIG_REG */
-+#define I2C_ADDRLEN_OFFSET 5
-+#define I2C_DEVADLEN_OFFSET 2
-+#define I2C_ADDRLEN_MASK 0x3
-+#define I2C_ADDR_DIS BIT(1)
-+#define I2C_DEVADDR_DIS BIT(0)
-+#define I2C_ADDRLEN_8 (7 << I2C_ADDRLEN_OFFSET)
-+#define I2C_DEVADLEN_7 (6 << I2C_DEVADLEN_OFFSET)
-+#define I2C_CONF_DEFAULT (I2C_ADDRLEN_8 | I2C_DEVADLEN_7)
-+
-+/* REG_CLKDIV_REG */
-+#define I2C_CLKDIV_MASK 0xffff
-+
-+/* REG_DEVADDR_REG */
-+#define I2C_DEVADDR_MASK 0x7f
-+
-+/* REG_ADDR_REG */
-+#define I2C_ADDR_MASK 0xff
-+
-+/* REG_STATUS_REG */
+#define I2C_STARTERR BIT(4)
+#define I2C_ACKERR BIT(3)
+#define I2C_DATARDY BIT(2)
+#define I2C_SDOEMPTY BIT(1)
+#define I2C_BUSY BIT(0)
+
-+/* REG_STARTXFR_REG */
-+#define NOSTOP_CMD BIT(2)
-+#define NODATA_CMD BIT(1)
-+#define READ_CMD BIT(0)
++#define I2C_DEVADLEN_7 (6 << 2)
++#define I2C_ADDRDIS BIT(1)
+
-+/* REG_BYTECNT_REG */
-+#define BYTECNT_MAX 64
-+#define SET_BYTECNT(x) (x - 1)
++#define CLKDIV_VALUE 200 // clock rate is 40M, 40M / (200*2) = 100k (standard i2c bus rate).
++//#define CLKDIV_VALUE 50 // clock rate is 40M, 40M / (50*2) = 400k (fast i2c bus rate).
++
++#define READ_CMD 0x01
++#define WRITE_CMD 0x00
++#define READ_BLOCK 64
++
++#define SM0CTL0_OD BIT(31)
++#define SM0CTL0_VTRIG BIT(28)
++#define SM0CTL0_OUTHI BIT(6)
++#define SM0CTL0_STRETCH BIT(1)
++#define SM0CTL0_DEFAULT (SM0CTL0_OD | SM0CTL0_VTRIG | SM0CTL0_OUTHI | SM0CTL0_STRETCH)
+
+/* timeout waiting for I2C devices to respond (clock streching) */
-+#define TIMEOUT_MS 1000
-+#define DELAY_INTERVAL_US 100
-+
-+struct rt_i2c {
-+ void __iomem *base;
-+ struct clk *clk;
-+ struct device *dev;
-+ struct i2c_adapter adap;
-+ u32 cur_clk;
-+ u32 clk_div;
-+ u32 flags;
++#define RT_I2C_TIMEOUT (msecs_to_jiffies(1000))
++
++enum {
++ I2C_TYPE_RALINK,
++ I2C_TYPE_MEDIATEK,
+};
+
-+static void rt_i2c_w32(struct rt_i2c *i2c, u32 val, unsigned reg)
++static void __iomem *membase;
++static struct i2c_adapter *adapter;
++static int hw_type;
++
++static void rt_i2c_w32(u32 val, unsigned reg)
+{
-+ iowrite32(val, i2c->base + reg);
++ iowrite32(val, membase + reg);
+}
+
-+static u32 rt_i2c_r32(struct rt_i2c *i2c, unsigned reg)
++static u32 rt_i2c_r32(unsigned reg)
+{
-+ return ioread32(i2c->base + reg);
++ return ioread32(membase + reg);
+}
+
-+static int poll_down_timeout(void __iomem *addr, u32 mask)
++static inline int rt_i2c_get_ack(void)
+{
-+ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);
++ return (rt_i2c_r32(REG_STATUS_REG) & I2C_ACKERR) ? -EIO : 0;
++}
++
++static inline int rt_i2c_wait_rx_done(void)
++{
++ unsigned long timeout;
++
++ timeout = jiffies + RT_I2C_TIMEOUT;
+
+ do {
-+ if (!(readl_relaxed(addr) & mask))
-+ return 0;
++ if (time_after(jiffies, timeout))
++ return (-ETIMEDOUT);
+
-+ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
-+ } while (time_before(jiffies, timeout));
++ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY));
+
-+ return (readl_relaxed(addr) & mask) ? -EAGAIN : 0;
++ return 0;
+}
+
-+static int rt_i2c_wait_idle(struct rt_i2c *i2c)
++static inline int rt_i2c_wait_idle(void)
+{
-+ int ret;
++ unsigned long timeout;
+
-+ ret = poll_down_timeout(i2c->base + REG_STATUS_REG, I2C_BUSY);
-+ if (ret < 0)
-+ dev_dbg(i2c->dev, "idle err(%d)\n", ret);
++ timeout = jiffies + RT_I2C_TIMEOUT;
+
-+ return ret;
++ do {
++ if (time_after(jiffies, timeout)) {
++ printk("i2c-read line busy\n");
++ return 1;
++ }
++ } while (rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY);
++
++ return 0;
+}
+
-+static int poll_up_timeout(void __iomem *addr, u32 mask)
++static inline int rt_i2c_wait_tx_done(void)
+{
-+ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);
-+ u32 status;
++ unsigned long timeout;
+
-+ do {
-+ status = readl_relaxed(addr);
++ timeout = jiffies + RT_I2C_TIMEOUT;
+
-+ /* check error status */
-+ if (status & I2C_STARTERR)
-+ return -EAGAIN;
-+ else if (status & I2C_ACKERR)
-+ return -ENXIO;
-+ else if (status & mask)
-+ return 0;
++ do {
++ if (time_after(jiffies, timeout))
++ return (-ETIMEDOUT);
+
-+ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
-+ } while (time_before(jiffies, timeout));
++ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY));
+
-+ return -ETIMEDOUT;
++ return 0;
+}
+
-+static int rt_i2c_wait_rx_done(struct rt_i2c *i2c)
++static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg)
+{
-+ int ret;
-+
-+ ret = poll_up_timeout(i2c->base + REG_STATUS_REG, I2C_DATARDY);
-+ if (ret < 0)
-+ dev_dbg(i2c->dev, "rx err(%d)\n", ret);
++ int i = 0, j = 0, pos = 0;
++ int nblock = msg->len / READ_BLOCK;
++ int rem = msg->len % READ_BLOCK;
++ int ret = 0;
++
++ if (msg->flags & I2C_M_TEN) {
++ printk("10 bits addr not supported\n");
++ return -EINVAL;
++ }
+
-+ return ret;
-+}
++ if (msg->flags & I2C_M_RD) {
++ for (i = 0; i < nblock; i++) {
++ if (rt_i2c_wait_idle())
++ return -ETIMEDOUT;
++ rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG);
++ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
++ for (j = 0; j < READ_BLOCK; j++) {
++ if (rt_i2c_wait_rx_done() < 0)
++ ret = rt_i2c_wait_rx_done();
++ if (rt_i2c_get_ack() < 0)
++ ret = rt_i2c_get_ack();
++ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
++ }
++ }
+
-+static int rt_i2c_wait_tx_done(struct rt_i2c *i2c)
-+{
-+ int ret;
++ if (rt_i2c_wait_idle())
++ return -ETIMEDOUT;
++ if (rem) {
++ rt_i2c_w32(rem - 1, REG_BYTECNT_REG);
++ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
++ }
++ for (i = 0; i < rem; i++) {
++ if (rt_i2c_wait_rx_done() < 0)
++ ret = rt_i2c_wait_rx_done();
++ if (rt_i2c_get_ack() < 0)
++ ret = rt_i2c_get_ack();
+
-+ ret = poll_up_timeout(i2c->base + REG_STATUS_REG, I2C_SDOEMPTY);
-+ if (ret < 0)
-+ dev_dbg(i2c->dev, "tx err(%d)\n", ret);
++ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
++ }
++ } else {
++ if (rt_i2c_wait_idle())
++ return -ETIMEDOUT;
++ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
++ for (i = 0; i < msg->len; i++) {
++ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
++ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
++
++ if (rt_i2c_wait_tx_done() < 0)
++ ret = rt_i2c_wait_tx_done();
++ if (rt_i2c_get_ack() < 0)
++ ret = rt_i2c_get_ack();
++ }
++ }
+
+ return ret;
+}
+
-+static void rt_i2c_reset(struct rt_i2c *i2c)
++static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n)
+{
-+ device_reset(i2c->adap.dev.parent);
-+ barrier();
-+ rt_i2c_w32(i2c, i2c->clk_div, REG_CLKDIV_REG);
-+}
++ int i = 0;
++ int ret = 0;
+
-+static void rt_i2c_dump_reg(struct rt_i2c *i2c)
-+{
-+ dev_dbg(i2c->dev, "conf %08x, clkdiv %08x, devaddr %08x, " \
-+ "addr %08x, dataout %08x, datain %08x, " \
-+ "status %08x, startxfr %08x, bytecnt %08x\n",
-+ rt_i2c_r32(i2c, REG_CONFIG_REG),
-+ rt_i2c_r32(i2c, REG_CLKDIV_REG),
-+ rt_i2c_r32(i2c, REG_DEVADDR_REG),
-+ rt_i2c_r32(i2c, REG_ADDR_REG),
-+ rt_i2c_r32(i2c, REG_DATAOUT_REG),
-+ rt_i2c_r32(i2c, REG_DATAIN_REG),
-+ rt_i2c_r32(i2c, REG_STATUS_REG),
-+ rt_i2c_r32(i2c, REG_STARTXFR_REG),
-+ rt_i2c_r32(i2c, REG_BYTECNT_REG));
-+}
++ if (rt_i2c_wait_idle())
++ return -ETIMEDOUT;
+
-+static int rt_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
-+ int num)
-+{
-+ struct rt_i2c *i2c;
-+ struct i2c_msg *pmsg;
-+ unsigned char addr;
-+ int i, j, ret;
-+ u32 cmd;
-+
-+ i2c = i2c_get_adapdata(adap);
-+
-+ for (i = 0; i < num; i++) {
-+ pmsg = &msgs[i];
-+ if (i == (num - 1))
-+ cmd = 0;
-+ else
-+ cmd = NOSTOP_CMD;
-+
-+ dev_dbg(i2c->dev, "addr: 0x%x, len: %d, flags: 0x%x, stop: %d\n",
-+ pmsg->addr, pmsg->len, pmsg->flags,
-+ (cmd == 0)? 1 : 0);
-+
-+ /* wait hardware idle */
-+ if ((ret = rt_i2c_wait_idle(i2c)))
-+ goto err_timeout;
-+
-+ if (pmsg->flags & I2C_M_TEN) {
-+ rt_i2c_w32(i2c, I2C_CONF_DEFAULT, REG_CONFIG_REG);
-+ /* 10 bits address */
-+ addr = 0x78 | ((pmsg->addr >> 8) & 0x03);
-+ rt_i2c_w32(i2c, addr & I2C_DEVADDR_MASK,
-+ REG_DEVADDR_REG);
-+ rt_i2c_w32(i2c, pmsg->addr & I2C_ADDR_MASK,
-+ REG_ADDR_REG);
-+ } else {
-+ rt_i2c_w32(i2c, I2C_CONF_DEFAULT | I2C_ADDR_DIS,
-+ REG_CONFIG_REG);
-+ /* 7 bits address */
-+ rt_i2c_w32(i2c, pmsg->addr & I2C_DEVADDR_MASK,
-+ REG_DEVADDR_REG);
-+ }
++ device_reset(a->dev.parent);
+
-+ /* buffer length */
-+ if (pmsg->len == 0)
-+ cmd |= NODATA_CMD;
-+ else
-+ rt_i2c_w32(i2c, SET_BYTECNT(pmsg->len),
-+ REG_BYTECNT_REG);
-+
-+ j = 0;
-+ if (pmsg->flags & I2C_M_RD) {
-+ cmd |= READ_CMD;
-+ /* start transfer */
-+ barrier();
-+ rt_i2c_w32(i2c, cmd, REG_STARTXFR_REG);
-+ do {
-+ /* wait */
-+ if ((ret = rt_i2c_wait_rx_done(i2c)))
-+ goto err_timeout;
-+ /* read data */
-+ if (pmsg->len)
-+ pmsg->buf[j] = rt_i2c_r32(i2c,
-+ REG_DATAIN_REG);
-+ j++;
-+ } while (j < pmsg->len);
-+ } else {
-+ do {
-+ /* write data */
-+ if (pmsg->len)
-+ rt_i2c_w32(i2c, pmsg->buf[j],
-+ REG_DATAOUT_REG);
-+ /* start transfer */
-+ if (j == 0) {
-+ barrier();
-+ rt_i2c_w32(i2c, cmd, REG_STARTXFR_REG);
-+ }
-+ /* wait */
-+ if ((ret = rt_i2c_wait_tx_done(i2c)))
-+ goto err_timeout;
-+ j++;
-+ } while (j < pmsg->len);
-+ }
++ rt_i2c_w32(m->addr, REG_DEVADDR_REG);
++ rt_i2c_w32(I2C_DEVADLEN_7 | I2C_ADDRDIS, REG_CONFIG_REG);
++ if (hw_type == I2C_TYPE_RALINK) {
++ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG);
++ } else {
++ rt_i2c_w32((CLKDIV_VALUE << 16) | SM0CTL0_DEFAULT, REG_SM0CTL0);
++ rt_i2c_w32(1, REG_SM0CFG2);
+ }
-+ /* the return value is number of executed messages */
-+ ret = i;
+
-+ return ret;
++ for (i = 0; i < n && !ret; i++) {
++ ret = rt_i2c_handle_msg(a, &m[i]);
+
-+err_timeout:
-+ rt_i2c_dump_reg(i2c);
-+ rt_i2c_reset(i2c);
-+ return ret;
++ if (ret < 0) {
++ return ret;
++ }
++ }
++
++ return n;
+}
+
+static u32 rt_i2c_func(struct i2c_adapter *a)
@@ -371,110 +311,60 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+};
+
+static const struct of_device_id i2c_rt_dt_ids[] = {
-+ { .compatible = "ralink,rt2880-i2c" },
++ { .compatible = "ralink,rt2880-i2c", .data = (void *) I2C_TYPE_RALINK },
++ { .compatible = "mediatek,mt7628-i2c", .data = (void *) I2C_TYPE_MEDIATEK },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
+
-+static struct i2c_adapter_quirks rt_i2c_quirks = {
-+ .max_write_len = BYTECNT_MAX,
-+ .max_read_len = BYTECNT_MAX,
-+};
-+
-+static int rt_i2c_init(struct rt_i2c *i2c)
-+{
-+ u32 reg;
-+
-+ /* i2c_sclk = periph_clk / ((2 * clk_div) + 5) */
-+ i2c->clk_div = (clk_get_rate(i2c->clk) - (5 * i2c->cur_clk)) /
-+ (2 * i2c->cur_clk);
-+ if (i2c->clk_div < 8)
-+ i2c->clk_div = 8;
-+ if (i2c->clk_div > I2C_CLKDIV_MASK)
-+ i2c->clk_div = I2C_CLKDIV_MASK;
-+
-+ /* check support combinde/repeated start message */
-+ rt_i2c_w32(i2c, NOSTOP_CMD, REG_STARTXFR_REG);
-+ reg = rt_i2c_r32(i2c, REG_STARTXFR_REG) & NOSTOP_CMD;
-+
-+ rt_i2c_reset(i2c);
-+
-+ return reg;
-+}
-+
+static int rt_i2c_probe(struct platform_device *pdev)
+{
-+ struct resource *res;
-+ struct rt_i2c *i2c;
-+ struct i2c_adapter *adap;
++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ const struct of_device_id *match;
-+ int ret, restart;
++ int ret;
+
+ match = of_match_device(i2c_rt_dt_ids, &pdev->dev);
++ hw_type = (int) match->data;
+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource found\n");
+ return -ENODEV;
+ }
+
-+ i2c = devm_kzalloc(&pdev->dev, sizeof(struct rt_i2c), GFP_KERNEL);
-+ if (!i2c) {
++ adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter), GFP_KERNEL);
++ if (!adapter) {
+ dev_err(&pdev->dev, "failed to allocate i2c_adapter\n");
+ return -ENOMEM;
+ }
+
-+ i2c->base = devm_ioremap_resource(&pdev->dev, res);
-+ if (IS_ERR(i2c->base))
-+ return PTR_ERR(i2c->base);
-+
-+ i2c->clk = devm_clk_get(&pdev->dev, NULL);
-+ if (IS_ERR(i2c->clk)) {
-+ dev_err(&pdev->dev, "no clock defined\n");
-+ return -ENODEV;
-+ }
-+ clk_prepare_enable(i2c->clk);
-+ i2c->dev = &pdev->dev;
-+
-+ if (of_property_read_u32(pdev->dev.of_node,
-+ "clock-frequency", &i2c->cur_clk))
-+ i2c->cur_clk = 100000;
-+
-+ adap = &i2c->adap;
-+ adap->owner = THIS_MODULE;
-+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
-+ adap->algo = &rt_i2c_algo;
-+ adap->retries = 3;
-+ adap->dev.parent = &pdev->dev;
-+ i2c_set_adapdata(adap, i2c);
-+ adap->dev.of_node = pdev->dev.of_node;
-+ strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
-+ adap->quirks = &rt_i2c_quirks;
-+
-+ platform_set_drvdata(pdev, i2c);
-+
-+ restart = rt_i2c_init(i2c);
-+
-+ ret = i2c_add_adapter(adap);
-+ if (ret < 0) {
-+ dev_err(&pdev->dev, "failed to add adapter\n");
-+ clk_disable_unprepare(i2c->clk);
++ membase = devm_ioremap_resource(&pdev->dev, res);
++ if (IS_ERR(membase))
++ return PTR_ERR(membase);
++
++ strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name));
++ adapter->owner = THIS_MODULE;
++ adapter->nr = pdev->id;
++ adapter->timeout = HZ;
++ adapter->algo = &rt_i2c_algo;
++ adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
++ adapter->dev.parent = &pdev->dev;
++ adapter->dev.of_node = pdev->dev.of_node;
++
++ ret = i2c_add_numbered_adapter(adapter);
++ if (ret)
+ return ret;
-+ }
+
-+ dev_info(&pdev->dev, "clock %uKHz, re-start %ssupport\n",
-+ i2c->cur_clk/1000, restart ? "" : "not ");
++ platform_set_drvdata(pdev, adapter);
+
-+ return ret;
++ dev_info(&pdev->dev, "loaded\n");
++
++ return 0;
+}
+
+static int rt_i2c_remove(struct platform_device *pdev)
+{
-+ struct rt_i2c *i2c = platform_get_drvdata(pdev);
-+
-+ i2c_del_adapter(&i2c->adap);
-+ clk_disable_unprepare(i2c->clk);
++ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
@@ -499,7 +389,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+{
+ platform_driver_unregister(&rt_i2c_driver);
+}
-+module_exit(i2c_rt_exit);
++
++module_exit (i2c_rt_exit);
+
+MODULE_AUTHOR("Steven Liu <steven_liu@mediatek.com>");
+MODULE_DESCRIPTION("Ralink I2c host driver");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 09:42:14 +0000