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mmc: esdhc-imx: parse max-frequency from devicetree
In order to make it possible to reduce the SD bus frequency, parse the optional "max-frequency" attribute as documented in devicetree/bindings/mmc/mmc.txt Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
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2 changed files with 18 additions and 1 deletions
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@ -384,6 +384,20 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
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}
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}
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static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct pltfm_imx_data *imx_data = pltfm_host->priv;
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struct esdhc_platform_data *boarddata = &imx_data->boarddata;
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u32 f_host = clk_get_rate(pltfm_host->clk);
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if (boarddata->f_max && (boarddata->f_max < f_host))
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return boarddata->f_max;
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else
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return f_host;
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}
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static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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@ -447,7 +461,7 @@ static const struct sdhci_ops sdhci_esdhc_ops = {
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.write_w = esdhc_writew_le,
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.write_b = esdhc_writeb_le,
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.set_clock = esdhc_pltfm_set_clock,
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.get_max_clock = esdhc_pltfm_get_max_clock,
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.get_min_clock = esdhc_pltfm_get_min_clock,
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.get_ro = esdhc_pltfm_get_ro,
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.platform_bus_width = esdhc_pltfm_bus_width,
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@ -490,6 +504,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
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of_property_read_u32(np, "bus-width", &boarddata->max_bus_width);
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of_property_read_u32(np, "max-frequency", &boarddata->f_max);
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return 0;
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}
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#else
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@ -40,5 +40,6 @@ struct esdhc_platform_data {
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enum wp_types wp_type;
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enum cd_types cd_type;
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int max_bus_width;
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unsigned int f_max;
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};
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#endif /* __ASM_ARCH_IMX_ESDHC_H */
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