linux-imx

/*

 * OF helpers for parsing display timings

 *

 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix

 *

 * based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de>

 *

 * This file is released under the GPLv2

 */

#include <linux/export.h>

#include <linux/of.h>

#include <linux/slab.h>

#include <video/display_timing.h>

#include <video/of_display_timing.h>

​

/**

 * parse_timing_property - parse timing_entry from device_node

 * @np: device_node with the property

 * @name: name of the property

 * @result: will be set to the return value

 *

 * DESCRIPTION:

 * Every display_timing can be specified with either just the typical value or

 * a range consisting of min/typ/max. This function helps handling this

 **/

static int parse_timing_property(const struct device_node *np, const char *name,

              struct timing_entry *result)

{

    struct property *prop;

    int length, cells, ret;

​

    prop = of_find_property(np, name, &length);

    if (!prop) {

        pr_err("%pOF: could not find property %s\n", np, name);

        return -EINVAL;

    }

​

    cells = length / sizeof(u32);

    if (cells == 1) {

        ret = of_property_read_u32(np, name, &result->typ);

        result->min = result->typ;

        result->max = result->typ;

    } else if (cells == 3) {

        ret = of_property_read_u32_array(np, name, &result->min, cells);

    } else {

        pr_err("%pOF: illegal timing specification in %s\n", np, name);

        return -EINVAL;

    }

​

    return ret;

}

​

/**

 * of_parse_display_timing - parse display_timing entry from device_node

 * @np: device_node with the properties

 **/

static int of_parse_display_timing(const struct device_node *np,

        struct display_timing *dt)

{

    u32 val = 0;

    int ret = 0;

​

    memset(dt, 0, sizeof(*dt));