s5j/i2c: remove s5j_i2c_reset()

s5j_i2c_reset() is not in use. It is compiled only when we have enabled
CONFIG_I2C_RESET which depends on ARCH_HAVE_I2CRESET, but it is never
set in S5J platform. Both Kconfig knobs have never been enabled, so
there is no point in having s5j_i2c_reset(). This commit removes it.

This commit does not make any functional differences.

Change-Id: Ia14f169fee75d0b4bde60595b020f5a8bf93895f
Signed-off-by: Heesub Shin <heesub.shin@samsung.com>

diff --git a/os/arch/arm/src/s5j/s5j_i2c.c b/os/arch/arm/src/s5j/s5j_i2c.c
index bc456e0..cdbef5e 100644 (file)
--- a/os/arch/arm/src/s5j/s5j_i2c.c
+++ b/os/arch/arm/src/s5j/s5j_i2c.c
@@ -1263,115 +1263,6 @@ int s5j_i2c_write(FAR struct i2c_dev_s *dev, FAR const uint8_t *buffer, int bufl
 
 /**
  *
- * @brief   I2C bus reset
- * @param    struct i2c_master_s *dev : structure visible to the I2C client
- * @return    int : ==0 :OK
- * @note
- */
-#ifdef CONFIG_I2C_RESET
-int s5j_i2c_reset(FAR struct i2c_dev_s *dev)
-{
-       struct s5j_i2c_priv_s *priv = (struct s5j_i2c_priv_s *)dev;
-       unsigned int clock_count;
-       unsigned int stretch_count;
-       unsigned int scl_gpio;
-       unsigned int sda_gpio;
-       int ret = ERROR;
-
-       DEBUGASSERT(priv && priv->config);
-
-       /* Our caller must own a ref */
-
-       ASSERT(priv->refs > 0);
-
-       /* Lock out other clients */
-
-       s5j_i2c_sem_wait(priv);
-
-       /* Un-initialize the port */
-
-       s5j_i2c_uninitialize(priv);
-
-       /* Use GPIO configuration to un-wedge the bus */
-
-       scl_gpio = priv->config->scl_pin;
-       sda_gpio = priv->config->sda_pin;
-
-       gpio_cfg_pin(scl_gpio, GPIO_FUNC(1));
-       gpio_cfg_pin(sda_gpio, GPIO_FUNC(1));
-
-       /* Let SDA go high */
-
-       gpio_set_value(sda_gpio, 1);
-       /* Clock the bus until any slaves currently driving it let it go. */
-
-       clock_count = 0;
-       while (!gpio_get_value(sda_gpio)) {
-               /* Give up if we have tried too hard */
-
-               if (clock_count++ > 10) {
-                       goto out;
-               }
-
-               /* Sniff to make sure that clock stretching has finished.
-                *
-                * If the bus never relaxes, the reset has failed.
-                */
-
-               stretch_count = 0;
-               while (!gpio_get_value(scl_gpio)) {
-                       /* Give up if we have tried too hard */
-
-                       if (stretch_count++ > 10) {
-                               goto out;
-                       }
-
-                       up_udelay(10);
-               }
-
-               /* Drive SCL low */
-
-               gpio_set_value(scl_gpio, 0);
-               up_udelay(10);
-
-               /* Drive SCL high again */
-
-               gpio_set_value(scl_gpio, 1);
-               up_udelay(10);
-       }
-
-       /* Generate a start followed by a stop to reset slave
-        * state machines.
-        */
-
-       gpio_set_value(sda_gpio, 0);
-       up_udelay(10);
-       gpio_set_value(scl_gpio, 0);
-       up_udelay(10);
-       gpio_set_value(scl_gpio, 1);
-       up_udelay(10);
-       gpio_set_value(sda_gpio, 1);
-       up_udelay(10);
-
-       /* Revert the GPIO configuration. */
-
-       gpio_cfg_pin(scl_gpio, GPIO_FUNC(0));
-       gpio_cfg_pin(sda_gpio, GPIO_FUNC(0));
-       /* Re-init the port */
-
-       s5j_i2c_initialize(priv, priv->xfer_speed);
-       ret = OK;
-
-out:
-
-       /* Release the port for re-use by other clients */
-       s5j_i2c_sem_post(priv);
-       return ret;
-}
-#endif                                                 /* CONFIG_I2C_RESET */
-
-/**
- *
  * @brief   Initialize one I2C bus
  * @param    int port :
  * @return   struct i2c_master_s : device structure

diff --git a/os/arch/arm/src/s5j/s5j_i2c.h b/os/arch/arm/src/s5j/s5j_i2c.h
index 942dab4..ec7e839 100644 (file)
--- a/os/arch/arm/src/s5j/s5j_i2c.h
+++ b/os/arch/arm/src/s5j/s5j_i2c.h
@@ -271,10 +271,7 @@ int s5j_i2c_setownaddress(FAR struct i2c_dev_s *dev, int addr, int nbits);
 int s5j_i2c_transfer(struct i2c_dev_s *dev, struct i2c_msg_s *msgv, int msgc);
 int s5j_i2c_read(FAR struct i2c_dev_s *dev, FAR uint8_t *buffer, int buflen);
 int s5j_i2c_write(FAR struct i2c_dev_s *dev, FAR const uint8_t *buffer, int buflen);
-#ifdef CONFIG_I2C_RESET
-int s5j_i2c_reset(FAR struct i2c_dev_s *dev);
-#endif
 struct i2c_dev_s *up_i2cinitialize(int port);
 int s5j_i2cbus_uninitialize(FAR struct i2c_dev_s *dev);
 void s5j_i2c_register(int bus);
-#endif                                                 /* __ARCH_ARM_SRC_S5J_I2C_H */
+#endif /* __ARCH_ARM_SRC_S5J_I2C_H */