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    Subject[PATCH v4 5/8] mmc: sdhci-bcm-kona: Add basic use of clocks
    Date
    Enable the external clock needed by the host controller during the
    probe and disable it during the remove.

    Signed-off-by: Tim Kryger <tim.kryger@linaro.org>
    Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
    Reviewed-by: Matt Porter <matt.porter@linaro.org>
    ---
    drivers/mmc/host/sdhci-bcm-kona.c | 37 +++++++++++++++++++++++++++++++++++--
    1 file changed, 35 insertions(+), 2 deletions(-)

    diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c
    index 7a190fe..923eefa 100644
    --- a/drivers/mmc/host/sdhci-bcm-kona.c
    +++ b/drivers/mmc/host/sdhci-bcm-kona.c
    @@ -54,6 +54,7 @@

    struct sdhci_bcm_kona_dev {
    struct mutex write_lock; /* protect back to back writes */
    + struct clk *external_clk;
    };


    @@ -257,6 +258,24 @@ static int sdhci_bcm_kona_probe(struct platform_device *pdev)
    goto err_pltfm_free;
    }

    + /* Get and enable the external clock */
    + kona_dev->external_clk = devm_clk_get(dev, NULL);
    + if (IS_ERR(kona_dev->external_clk)) {
    + dev_err(dev, "Failed to get external clock\n");
    + ret = PTR_ERR(kona_dev->external_clk);
    + goto err_pltfm_free;
    + }
    +
    + if (clk_set_rate(kona_dev->external_clk, host->mmc->f_max) != 0) {
    + dev_err(dev, "Failed to set rate external clock\n");
    + goto err_pltfm_free;
    + }
    +
    + if (clk_prepare_enable(kona_dev->external_clk) != 0) {
    + dev_err(dev, "Failed to enable external clock\n");
    + goto err_pltfm_free;
    + }
    +
    dev_dbg(dev, "non-removable=%c\n",
    (host->mmc->caps & MMC_CAP_NONREMOVABLE) ? 'Y' : 'N');
    dev_dbg(dev, "cd_gpio %c, wp_gpio %c\n",
    @@ -271,7 +290,7 @@ static int sdhci_bcm_kona_probe(struct platform_device *pdev)

    ret = sdhci_bcm_kona_sd_reset(host);
    if (ret)
    - goto err_pltfm_free;
    + goto err_clk_disable;

    sdhci_bcm_kona_sd_init(host);

    @@ -307,6 +326,9 @@ err_remove_host:
    err_reset:
    sdhci_bcm_kona_sd_reset(host);

    +err_clk_disable:
    + clk_disable_unprepare(kona_dev->external_clk);
    +
    err_pltfm_free:
    sdhci_pltfm_free(pdev);

    @@ -316,7 +338,18 @@ err_pltfm_free:

    static int __exit sdhci_bcm_kona_remove(struct platform_device *pdev)
    {
    - return sdhci_pltfm_unregister(pdev);
    + struct sdhci_host *host = platform_get_drvdata(pdev);
    + struct sdhci_pltfm_host *pltfm_priv = sdhci_priv(host);
    + struct sdhci_bcm_kona_dev *kona_dev = sdhci_pltfm_priv(pltfm_priv);
    + int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
    +
    + sdhci_remove_host(host, dead);
    +
    + clk_disable_unprepare(kona_dev->external_clk);
    +
    + sdhci_pltfm_free(pdev);
    +
    + return 0;
    }

    static struct platform_driver sdhci_bcm_kona_driver = {
    --
    1.8.0.1


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