[PATCH 3/5] i2c: i2c-stm32f7: add driver
M'boumba Cedric Madianga
cedric.madianga at gmail.com
Fri Mar 17 02:58:56 PDT 2017
This patch adds initial support for the STM32F7 I2C controller.
Signed-off-by: M'boumba Cedric Madianga <cedric.madianga at gmail.com>
---
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-stm32f7.c | 562 +++++++++++++++++++++++++++++++++++++++
3 files changed, 573 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-stm32f7.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8adc0f1..ab0caec 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -897,6 +897,16 @@ config I2C_STM32F4
This driver can also be built as module. If so, the module
will be called i2c-stm32f4.
+config I2C_STM32F7
+ tristate "STMicroelectronics STM32F7 I2C support"
+ depends on ARCH_STM32 || COMPILE_TEST
+ help
+ Enable this option to add support for STM32 I2C controller embedded
+ in STM32F7 SoCs.
+
+ This driver can also be built as module. If so, the module
+ will be called i2c-stm32f7.
+
config I2C_STU300
tristate "ST Microelectronics DDC I2C interface"
depends on MACH_U300
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 30b6085..5449ece 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
obj-$(CONFIG_I2C_SIRF) += i2c-sirf.o
obj-$(CONFIG_I2C_ST) += i2c-st.o
obj-$(CONFIG_I2C_STM32F4) += i2c-stm32f4.o
+obj-$(CONFIG_I2C_STM32F7) += i2c-stm32f7.o
obj-$(CONFIG_I2C_STU300) += i2c-stu300.o
obj-$(CONFIG_I2C_SUN6I_P2WI) += i2c-sun6i-p2wi.o
obj-$(CONFIG_I2C_TEGRA) += i2c-tegra.o
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
new file mode 100644
index 0000000..844a98b
--- /dev/null
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -0,0 +1,562 @@
+/*
+ * Driver for STMicroelectronics STM32F7 I2C controller
+ *
+ * This I2C controller is described in the STM32F75xxx and STM32F74xxx Soc
+ * reference manual.
+ * Please see below a link to the documentation:
+ * http://www.st.com/resource/en/reference_manual/dm00124865.pdf
+ *
+ * Copyright (C) M'boumba Cedric Madianga 2017
+ * Author: M'boumba Cedric Madianga <cedric.madianga at gmail.com>
+ *
+ * This driver is based on i2c-stm32f4.c
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "i2c-stm32.h"
+
+/* STM32F7 I2C registers */
+#define STM32F7_I2C_CR1 0x00
+#define STM32F7_I2C_CR2 0x04
+#define STM32F7_I2C_TIMINGR 0x10
+#define STM32F7_I2C_ISR 0x18
+#define STM32F7_I2C_ICR 0x1C
+#define STM32F7_I2C_RXDR 0x24
+#define STM32F7_I2C_TXDR 0x28
+
+/* STM32F7 I2C control 1 */
+#define STM32F7_I2C_CR1_ERRIE BIT(7)
+#define STM32F7_I2C_CR1_TCIE BIT(6)
+#define STM32F7_I2C_CR1_STOPIE BIT(5)
+#define STM32F7_I2C_CR1_NACKIE BIT(4)
+#define STM32F7_I2C_CR1_ADDRIE BIT(3)
+#define STM32F7_I2C_CR1_RXIE BIT(2)
+#define STM32F7_I2C_CR1_TXIE BIT(1)
+#define STM32F7_I2C_CR1_PE BIT(0)
+#define STM32F7_I2C_ALL_IRQ_MASK (STM32F7_I2C_CR1_ERRIE \
+ | STM32F7_I2C_CR1_TCIE \
+ | STM32F7_I2C_CR1_STOPIE \
+ | STM32F7_I2C_CR1_NACKIE \
+ | STM32F7_I2C_CR1_RXIE \
+ | STM32F7_I2C_CR1_TXIE)
+
+/* STM32F7 I2C control 2 */
+#define STM32F7_I2C_CR2_RELOAD BIT(24)
+#define STM32F7_I2C_CR2_NBYTES_MASK GENMASK(23, 16)
+#define STM32F7_I2C_CR2_NBYTES(n) (((n) & 0xff) << 16)
+#define STM32F7_I2C_CR2_NACK BIT(15)
+#define STM32F7_I2C_CR2_STOP BIT(14)
+#define STM32F7_I2C_CR2_START BIT(13)
+#define STM32F7_I2C_CR2_RD_WRN BIT(10)
+#define STM32F7_I2C_CR2_SADD7_MASK GENMASK(7, 1)
+#define STM32F7_I2C_CR2_SADD7(n) (((n) & 0x7f) << 1)
+
+/* STM32F7 I2C Interrupt Status */
+#define STM32F7_I2C_ISR_BUSY BIT(15)
+#define STM32F7_I2C_ISR_ARLO BIT(9)
+#define STM32F7_I2C_ISR_BERR BIT(8)
+#define STM32F7_I2C_ISR_TCR BIT(7)
+#define STM32F7_I2C_ISR_TC BIT(6)
+#define STM32F7_I2C_ISR_STOPF BIT(5)
+#define STM32F7_I2C_ISR_NACKF BIT(4)
+#define STM32F7_I2C_ISR_RXNE BIT(2)
+#define STM32F7_I2C_ISR_TXIS BIT(1)
+
+/* STM32F7 I2C Interrupt Clear */
+#define STM32F7_I2C_ICR_ARLOCF BIT(9)
+#define STM32F7_I2C_ICR_BERRCF BIT(8)
+#define STM32F7_I2C_ICR_STOPCF BIT(5)
+#define STM32F7_I2C_ICR_NACKCF BIT(4)
+
+#define STM32F7_I2C_MAX_LEN 0xff
+
+/**
+ * struct stm32f7_i2c_msg - client specific data
+ * @addr: 8-bit slave addr, including r/w bit
+ * @count: number of bytes to be transferred
+ * @buf: data buffer
+ * @result: result of the transfer
+ * @stop: last I2C msg to be sent, i.e. STOP to be generated
+ */
+struct stm32f7_i2c_msg {
+ u8 addr;
+ u32 count;
+ u8 *buf;
+ int result;
+ bool stop;
+};
+
+/**
+ * struct stm32f7_i2c_dev - private data of the controller
+ * @adap: I2C adapter for this controller
+ * @dev: device for this controller
+ * @base: virtual memory area
+ * @complete: completion of I2C message
+ * @clk: hw i2c clock
+ * @speed: I2C clock frequency of the controller. Standard, Fast or Fast+
+ * @msg: Pointer to data to be written
+ * @msg_num: number of I2C messages to be executed
+ * @msg_id: message identifiant
+ * @f7_msg: customized i2c msg for driver usage
+ */
+struct stm32f7_i2c_dev {
+ struct i2c_adapter adap;
+ struct device *dev;
+ void __iomem *base;
+ struct completion complete;
+ struct clk *clk;
+ int speed;
+ struct i2c_msg *msg;
+ unsigned int msg_num;
+ unsigned int msg_id;
+ struct stm32f7_i2c_msg f7_msg;
+};
+
+static inline void stm32f7_i2c_set_bits(void __iomem *reg, u32 mask)
+{
+ writel_relaxed(readl_relaxed(reg) | mask, reg);
+}
+
+static inline void stm32f7_i2c_clr_bits(void __iomem *reg, u32 mask)
+{
+ writel_relaxed(readl_relaxed(reg) & ~mask, reg);
+}
+
+static int stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
+{
+ struct device_node *of_node = i2c_dev->dev->of_node;
+ u32 timing;
+ int ret;
+
+ ret = of_property_read_u32(of_node, "st,i2c-timing", &timing);
+ if (ret) {
+ dev_err(i2c_dev->dev, "Error: missing i2c timing property\n");
+ return ret;
+ }
+
+ /* Timing settings */
+ writel_relaxed(timing, i2c_dev->base + STM32F7_I2C_TIMINGR);
+
+ /* Enable I2C */
+ writel_relaxed(STM32F7_I2C_CR1_PE, i2c_dev->base + STM32F7_I2C_CR1);
+
+ return 0;
+}
+
+static void stm32f7_i2c_write_tx_data(struct stm32f7_i2c_dev *i2c_dev)
+{
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ void __iomem *base = i2c_dev->base;
+
+ if (f7_msg->count) {
+ writeb_relaxed(*f7_msg->buf++, base + STM32F7_I2C_TXDR);
+ f7_msg->count--;
+ }
+}
+
+static void stm32f7_i2c_read_rx_data(struct stm32f7_i2c_dev *i2c_dev)
+{
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ void __iomem *base = i2c_dev->base;
+
+ if (f7_msg->count) {
+ *f7_msg->buf++ = readb_relaxed(base + STM32F7_I2C_RXDR);
+ f7_msg->count--;
+ }
+}
+
+static void stm32f7_i2c_reload(struct stm32f7_i2c_dev *i2c_dev)
+{
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ u32 cr2;
+
+ cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
+
+ cr2 &= ~STM32F7_I2C_CR2_NBYTES_MASK;
+ if (f7_msg->count > STM32F7_I2C_MAX_LEN) {
+ cr2 |= STM32F7_I2C_CR2_NBYTES(STM32F7_I2C_MAX_LEN);
+ } else {
+ cr2 &= ~STM32F7_I2C_CR2_RELOAD;
+ cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
+ }
+
+ writel_relaxed(cr2, i2c_dev->base + STM32F7_I2C_CR2);
+}
+
+static int stm32f7_i2c_wait_free_bus(struct stm32f7_i2c_dev *i2c_dev)
+{
+ u32 status;
+ int ret;
+
+ ret = readl_relaxed_poll_timeout(i2c_dev->base + STM32F7_I2C_ISR,
+ status,
+ !(status & STM32F7_I2C_ISR_BUSY),
+ 10, 1000);
+ if (ret) {
+ dev_dbg(i2c_dev->dev, "bus busy\n");
+ ret = -EBUSY;
+ }
+
+ return ret;
+}
+
+static void stm32f7_i2c_xfer_msg(struct stm32f7_i2c_dev *i2c_dev,
+ struct i2c_msg *msg)
+{
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ void __iomem *base = i2c_dev->base;
+ u32 cr1, cr2;
+
+ f7_msg->addr = msg->addr;
+ f7_msg->buf = msg->buf;
+ f7_msg->count = msg->len;
+ f7_msg->result = 0;
+ f7_msg->stop = (i2c_dev->msg_id >= i2c_dev->msg_num - 1);
+
+ reinit_completion(&i2c_dev->complete);
+
+ cr1 = readl_relaxed(base + STM32F7_I2C_CR1);
+ cr2 = readl_relaxed(base + STM32F7_I2C_CR2);
+
+ /* Set transfer direction */
+ cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
+ if (msg->flags & I2C_M_RD)
+ cr2 |= STM32F7_I2C_CR2_RD_WRN;
+
+ /* Set slave address */
+ cr2 &= ~STM32F7_I2C_CR2_SADD7_MASK;
+ cr2 |= STM32F7_I2C_CR2_SADD7(f7_msg->addr);
+
+ /* Set nb bytes to transfer and reload if needed */
+ cr2 &= ~(STM32F7_I2C_CR2_NBYTES_MASK | STM32F7_I2C_CR2_RELOAD);
+ if (f7_msg->count > STM32F7_I2C_MAX_LEN) {
+ cr2 |= STM32F7_I2C_CR2_NBYTES(STM32F7_I2C_MAX_LEN);
+ cr2 |= STM32F7_I2C_CR2_RELOAD;
+ } else {
+ cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
+ }
+
+ /* Enable NACK, STOP, error and transfer complete interrupts */
+ cr1 |= STM32F7_I2C_CR1_ERRIE | STM32F7_I2C_CR1_TCIE |
+ STM32F7_I2C_CR1_STOPIE | STM32F7_I2C_CR1_NACKIE;
+
+ /* Clear TX/RX interrupt */
+ cr1 &= ~(STM32F7_I2C_CR1_RXIE | STM32F7_I2C_CR1_TXIE);
+
+ /* Enable RX/TX interrupt according to msg direction */
+ if (msg->flags & I2C_M_RD)
+ cr1 |= STM32F7_I2C_CR1_RXIE;
+ else
+ cr1 |= STM32F7_I2C_CR1_TXIE;
+
+ /* Configure Start/Repeated Start */
+ cr2 |= STM32F7_I2C_CR2_START;
+
+ /* Write configurations registers */
+ writel_relaxed(cr1, base + STM32F7_I2C_CR1);
+ writel_relaxed(cr2, base + STM32F7_I2C_CR2);
+}
+
+static void stm32f7_i2c_disable_irq(struct stm32f7_i2c_dev *i2c_dev, u32 mask)
+{
+ stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, mask);
+}
+
+static irqreturn_t stm32f7_i2c_isr_event(int irq, void *data)
+{
+ struct stm32f7_i2c_dev *i2c_dev = data;
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ void __iomem *base = i2c_dev->base;
+ u32 status, mask;
+
+ status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
+
+ /* Tx empty */
+ if (status & STM32F7_I2C_ISR_TXIS)
+ stm32f7_i2c_write_tx_data(i2c_dev);
+
+ /* RX not empty */
+ if (status & STM32F7_I2C_ISR_RXNE)
+ stm32f7_i2c_read_rx_data(i2c_dev);
+
+ /* NACK received */
+ if (status & STM32F7_I2C_ISR_NACKF) {
+ dev_dbg(i2c_dev->dev, "<%s>: Receive NACK\n", __func__);
+ writel_relaxed(STM32F7_I2C_ICR_NACKCF, base + STM32F7_I2C_ICR);
+ f7_msg->result = -EBADE;
+ }
+
+ /* STOP detection flag */
+ if (status & STM32F7_I2C_ISR_STOPF) {
+ /* Disable interrupts */
+ stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_ALL_IRQ_MASK);
+
+ /* Clear STOP flag */
+ writel_relaxed(STM32F7_I2C_ICR_STOPCF, base + STM32F7_I2C_ICR);
+
+ complete(&i2c_dev->complete);
+ }
+
+ /* Transfer complete */
+ if (status & STM32F7_I2C_ISR_TC) {
+ if (f7_msg->stop) {
+ mask = STM32F7_I2C_CR2_STOP;
+ stm32f7_i2c_set_bits(base + STM32F7_I2C_CR2, mask);
+ } else {
+ i2c_dev->msg_id++;
+ i2c_dev->msg++;
+ stm32f7_i2c_xfer_msg(i2c_dev, i2c_dev->msg);
+ }
+ }
+
+ /*
+ * Transfer Complete Reload: 255 data bytes have been transferred
+ * We have to prepare the I2C controller to transfer the remaining
+ * data
+ */
+ if (status & STM32F7_I2C_ISR_TCR)
+ stm32f7_i2c_reload(i2c_dev);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
+{
+ struct stm32f7_i2c_dev *i2c_dev = data;
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ void __iomem *base = i2c_dev->base;
+ struct device *dev = i2c_dev->dev;
+ u32 status;
+
+ status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
+
+ /* Bus error */
+ if (status & STM32F7_I2C_ISR_BERR) {
+ dev_err(dev, "<%s>: Bus error\n", __func__);
+ writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
+ f7_msg->result = -EIO;
+ }
+
+ /* Arbitration loss */
+ if (status & STM32F7_I2C_ISR_ARLO) {
+ dev_err(dev, "<%s>: Arbitration loss\n", __func__);
+ writel_relaxed(STM32F7_I2C_ICR_ARLOCF, base + STM32F7_I2C_ICR);
+ f7_msg->result = -EAGAIN;
+ }
+
+ stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_ALL_IRQ_MASK);
+
+ complete(&i2c_dev->complete);
+
+ return IRQ_HANDLED;
+}
+
+static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
+ struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
+ unsigned long timeout;
+ int ret;
+
+ i2c_dev->msg = msgs;
+ i2c_dev->msg_num = num;
+ i2c_dev->msg_id = 0;
+
+ ret = clk_enable(i2c_dev->clk);
+ if (ret) {
+ dev_err(i2c_dev->dev, "Failed to enable clock\n");
+ return ret;
+ }
+
+ ret = stm32f7_i2c_wait_free_bus(i2c_dev);
+ if (ret)
+ goto clk_free;
+
+ stm32f7_i2c_xfer_msg(i2c_dev, msgs);
+
+ timeout = wait_for_completion_timeout(&i2c_dev->complete,
+ i2c_dev->adap.timeout);
+ ret = f7_msg->result;
+
+ if (!timeout) {
+ dev_dbg(i2c_dev->dev, "Access to slave 0x%x timed out\n",
+ i2c_dev->msg->addr);
+ ret = -ETIMEDOUT;
+ }
+
+clk_free:
+ clk_disable(i2c_dev->clk);
+
+ return (ret < 0) ? ret : num;
+}
+
+static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm stm32f7_i2c_algo = {
+ .master_xfer = stm32f7_i2c_xfer,
+ .functionality = stm32f7_i2c_func,
+};
+
+static int stm32f7_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct stm32f7_i2c_dev *i2c_dev;
+ struct resource *res;
+ u32 irq_event, irq_error, clk_rate;
+ struct i2c_adapter *adap;
+ struct reset_control *rst;
+ int ret;
+
+ i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
+ if (!i2c_dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c_dev->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c_dev->base))
+ return PTR_ERR(i2c_dev->base);
+
+ irq_event = irq_of_parse_and_map(np, 0);
+ if (!irq_event) {
+ dev_err(&pdev->dev, "IRQ event missing or invalid\n");
+ return -EINVAL;
+ }
+
+ irq_error = irq_of_parse_and_map(np, 1);
+ if (!irq_error) {
+ dev_err(&pdev->dev, "IRQ error missing or invalid\n");
+ return -EINVAL;
+ }
+
+ i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(i2c_dev->clk)) {
+ dev_err(&pdev->dev, "Error: Missing controller clock\n");
+ return PTR_ERR(i2c_dev->clk);
+ }
+ ret = clk_prepare_enable(i2c_dev->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to prepare_enable clock\n");
+ return ret;
+ }
+
+ rst = devm_reset_control_get(&pdev->dev, NULL);
+ if (IS_ERR(rst)) {
+ dev_err(&pdev->dev, "Error: Missing controller reset\n");
+ ret = PTR_ERR(rst);
+ goto clk_free;
+ }
+ reset_control_assert(rst);
+ udelay(2);
+ reset_control_deassert(rst);
+
+ i2c_dev->speed = STM32_I2C_SPEED_STANDARD;
+ ret = of_property_read_u32(np, "clock-frequency", &clk_rate);
+ if ((!ret) && (clk_rate == 400000))
+ i2c_dev->speed = STM32_I2C_SPEED_FAST;
+ else if ((!ret) && (clk_rate == 1000000))
+ i2c_dev->speed = STM32_I2C_SPEED_FAST_PLUS;
+
+ i2c_dev->dev = &pdev->dev;
+
+ ret = devm_request_irq(&pdev->dev, irq_event, stm32f7_i2c_isr_event, 0,
+ pdev->name, i2c_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq event %i\n",
+ irq_event);
+ goto clk_free;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq_error, stm32f7_i2c_isr_error, 0,
+ pdev->name, i2c_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq error %i\n",
+ irq_error);
+ goto clk_free;
+ }
+
+ ret = stm32f7_i2c_hw_config(i2c_dev);
+ if (ret)
+ goto clk_free;
+
+ adap = &i2c_dev->adap;
+ i2c_set_adapdata(adap, i2c_dev);
+ snprintf(adap->name, sizeof(adap->name), "STM32F7 I2C(%pa)",
+ &res->start);
+ adap->owner = THIS_MODULE;
+ adap->timeout = 2 * HZ;
+ adap->retries = 0;
+ adap->algo = &stm32f7_i2c_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+
+ init_completion(&i2c_dev->complete);
+
+ ret = i2c_add_adapter(adap);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add adapter\n");
+ goto clk_free;
+ }
+
+ platform_set_drvdata(pdev, i2c_dev);
+
+ clk_disable(i2c_dev->clk);
+
+ dev_info(i2c_dev->dev, "STM32F7 I2C-%d driver registered\n", adap->nr);
+
+ return 0;
+
+clk_free:
+ clk_disable_unprepare(i2c_dev->clk);
+
+ return ret;
+}
+
+static int stm32f7_i2c_remove(struct platform_device *pdev)
+{
+ struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(&i2c_dev->adap);
+
+ clk_unprepare(i2c_dev->clk);
+
+ return 0;
+}
+
+static const struct of_device_id stm32f7_i2c_match[] = {
+ { .compatible = "st,stm32f7-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stm32f7_i2c_match);
+
+static struct platform_driver stm32f7_i2c_driver = {
+ .driver = {
+ .name = "stm32f7-i2c",
+ .of_match_table = stm32f7_i2c_match,
+ },
+ .probe = stm32f7_i2c_probe,
+ .remove = stm32f7_i2c_remove,
+};
+
+module_platform_driver(stm32f7_i2c_driver);
+
+MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga at gmail.com>");
+MODULE_DESCRIPTION("STMicroelectronics STM32F7 I2C driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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