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sensor_clock.c

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/*
 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @file sensor_clock.c
 *
 * @brief camera clock function
 *
 * @ingroup Camera
 */
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/clk.h>

#if defined(CONFIG_MXC_IPU_V1) || defined(CONFIG_VIDEO_MXC_EMMA_CAMERA) \
                         || defined(CONFIG_VIDEO_MXC_CSI_CAMERA_MODULE) \
                         || defined(CONFIG_VIDEO_MXC_CSI_CAMERA)
/*
 * set_mclk_rate
 *
 * @param       p_mclk_freq  mclk frequence
 *
 */
void set_mclk_rate(uint32_t * p_mclk_freq)
{
      struct clk *clk;
      uint32_t freq = 0;

      clk = clk_get(NULL, "csi_clk");

      freq = clk_round_rate(clk, *p_mclk_freq);
      clk_set_rate(clk, freq);

      *p_mclk_freq = freq;

      clk_put(clk);
      pr_debug("mclk frequency = %d\n", *p_mclk_freq);
}
#else
/*
 * set_mclk_rate
 *
 * @param       p_mclk_freq  mclk frequence
 * @param   csi         csi 0 or csi 1
 *
 */
void set_mclk_rate(uint32_t *p_mclk_freq, uint32_t csi)
{
      struct clk *clk;
      uint32_t freq = 0;
      char *mclk;

      if (csi == 0) {
            mclk = "csi_mclk1";
      } else if (csi == 1) {
            mclk = "csi_mclk2";
      } else {
            pr_debug("invalid csi num %d\n", csi);
            return;
      }

      clk = clk_get(NULL, mclk);

      freq = clk_round_rate(clk, *p_mclk_freq);
      clk_set_rate(clk, freq);

      *p_mclk_freq = freq;

      clk_put(clk);
      pr_debug("%s frequency = %d\n", mclk, *p_mclk_freq);
}
#endif

/* Exported symbols for modules. */
EXPORT_SYMBOL(set_mclk_rate);

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