ENABLE MIPI FOR I.MX6 SOLO BOARD

[dhanaj]

Hi all,

          I am working in a imx6 solo wandboard, in that i need to integrate the camera ov5640 with mipi interface, for that i want to done the mux pad settings for camera data, clock, reset and pwdn, can any one tell me how to do that, i am new to this camera and linux drivers

Thanks,

dhana

[davemcmordie]

Hi,

I believe John Weber's recent kernel release includes a version of arch/arch/mach-mx6/board-wand.c which sets the pads correctly for mipi input from this camera:

https://groups.google.com/d/topic/wandboard/8T9L1LFL0G0/discussion

The relevant snippets are below:

#ifdef CONFIG_IMX_HAVE_PLATFORM_IMX_MIPI_CSI2
/****************************************************************************
 *
 * MIPI CSI
 *
 ****************************************************************************/
static void wand_mipi_sensor_io_init(void)
{
  struct clk *mipi_csi_mclk;
  int rate;


  IMX6_SETUP_PAD(GPIO_3__CCM_CLKO2);  /* Camera clock */
  IMX6_SETUP_PAD(KEY_COL4__GPIO_4_14);/* Camera reset */
  IMX6_SETUP_PAD(GPIO_6__GPIO_1_6);   /* Camera power down */


  pr_debug("%s\n", __func__);


  gpio_request(WAND_MIPICSI_RESET, "cam-reset");
  gpio_direction_output(WAND_MIPICSI_RESET, 1);


  gpio_request(WAND_MIPICSI_PWN, "cam-pwdn");
  gpio_direction_output(WAND_MIPICSI_PWN, 1);


  /* Master clock for the sensor */
  mipi_csi_mclk = clk_get(NULL, "clko2_clk");
  if (IS_ERR(mipi_csi_mclk)) {
  pr_err("can't get CLKO2 clock.\n");
  return;
  }


  rate = clk_round_rate(mipi_csi_mclk, 24000000);
  clk_set_rate(mipi_csi_mclk, rate);
  clk_enable(mipi_csi_mclk);


  msleep(5);
  /* Power up */
  gpio_set_value(WAND_MIPICSI_PWN, 0);
  msleep(5);
  /* Reset on */
  gpio_set_value(WAND_MIPICSI_RESET, 0);
  msleep(1);
  /* Reset off */
  gpio_set_value(WAND_MIPICSI_RESET, 1);
  msleep(5);
  /* power down */
  gpio_set_value(WAND_MIPICSI_PWN, 1);


  /* For MX6Q:
  * GPR1 bit19 and bit20 meaning:
  * Bit19:       0 - Enable mipi to IPU1 CSI0
  *                      virtual channel is fixed to 0
  *              1 - Enable parallel interface to IPU1 CSI0
  * Bit20:       0 - Enable mipi to IPU2 CSI1
  *                      virtual channel is fixed to 3
  *              1 - Enable parallel interface to IPU2 CSI1
  * IPU1 CSI1 directly connect to mipi csi2,
  *      virtual channel is fixed to 1
  * IPU2 CSI0 directly connect to mipi csi2,
  *      virtual channel is fixed to 2
  *
  * For MX6DL:
  * GPR13 bit 0-2 IPU_CSI0_MUX
  *   000 MIPI_CSI0
  *   100 IPU CSI0
  */


  if (cpu_is_mx6q())
  mxc_iomux_set_gpr_register(1, 19, 1, 0);
  else if (cpu_is_mx6dl())
  mxc_iomux_set_gpr_register(13, 0, 3, 0);
}


static void wand_mipi_powerdown(int powerdown)
{
  pr_debug("%s: powerdown=%d\n", __func__, powerdown);


  if (powerdown)
  gpio_set_value(WAND_MIPICSI_PWN, 1); /* Power off */
  else
  gpio_set_value(WAND_MIPICSI_PWN, 0); /* Power on */


  msleep(2);
}


/* Platform data for CSI sensor driver, passed to driver
   through i2c platform data */
static struct fsl_mxc_camera_platform_data wand_mipi_csi2_data = {
  .mclk = 24000000,
  .mclk_source = 0,
  .csi = 0,
  .io_init = wand_mipi_sensor_io_init,
  .pwdn = wand_mipi_powerdown,
};


/* TODO - reorg code so that adding i2c board info is done all in one
   step at init.  This makes adding I2C devices easier */
static struct i2c_board_info wand_mipi_csi_i2c_board_info[] __initdata = {
  {
  I2C_BOARD_INFO("ov5640_mipi", 0x3C),
  .platform_data = (void *)&wand_mipi_csi2_data,
  },
  {
  I2C_BOARD_INFO("ov5647_mipi", 0x36),
  .platform_data = (void *)&wand_mipi_csi2_data,
  },
};


/* Platform data for MIPI CSI init */
static struct mipi_csi2_platform_data wand_mipi_csi2_platform_data = {
  .ipu_id = 0,
  .csi_id = 0,
  .v_channel = 0,
  .lanes = 2,
  .dphy_clk = "mipi_pllref_clk",
  .pixel_clk = "emi_clk",
};

HTH,

Dave

[imx6zeng]

hi Dave ，

Can you tell me  where can i  download John Weber's recent kernel?

Thanks,

andy zeng

[davemcmordie]

Right here (use wandboard_imx_3.0.35_4.0.0 branch):

johnweber/linux · GitHub

Best,

Dave

[imx6zeng]

Hi Dave

Thank you very much.

Best

Andy

发件人: Dave McMordie

发送时间: 2013年8月28日 20:58

收件人: imx6 zeng

主题: Re: - ENABLE MIPI FOR I.MX6 SOLO BOARD

<https://community.freescale.com/> Freescale Community

ENABLE MIPI FOR I.MX6 SOLO BOARD

reply from Dave <https://community.freescale.com/people/davemcmordie?et=watches.email.thread> McMordie in i.MX Community - View <https://community.freescale.com/message/347182?et=watches.email.thread#347182> the full discussion