linux-imx

/*

 * Atmel (Multi-port DDR-)SDRAM Controller driver

 *

 * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>

 *

 * Copyright (C) 2014 Atmel

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 */

​

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

​

struct at91_ramc_caps {

    bool has_ddrck;

    bool has_mpddr_clk;

};

​

static const struct at91_ramc_caps at91rm9200_caps = { };

​

static const struct at91_ramc_caps at91sam9g45_caps = {

    .has_ddrck = 1,

    .has_mpddr_clk = 0,

};

​

static const struct at91_ramc_caps sama5d3_caps = {

    .has_ddrck = 1,

    .has_mpddr_clk = 1,

};

​

static const struct of_device_id atmel_ramc_of_match[] = {

    { .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },

    { .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },

    { .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },

    { .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },

    {},

};

​

static int atmel_ramc_probe(struct platform_device *pdev)

{

    const struct at91_ramc_caps *caps;

    struct clk *clk;

​

    caps = of_device_get_match_data(&pdev->dev);

​

    if (caps->has_ddrck) {

        clk = devm_clk_get(&pdev->dev, "ddrck");

        if (IS_ERR(clk))