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Commit 0ddf03c9 authored by Lucas Stach's avatar Lucas Stach Committed by Chris Ball
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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: default avatarLucas Stach <l.stach@pengutronix.de>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 8ba9580a

drivers/mmc/host/sdhci-esdhc-imx.c

+17 −1
Original line number Diff line number Diff line
@@ -384,6 +384,20 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg) 
	}

}



static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)

{

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct pltfm_imx_data *imx_data = pltfm_host->priv;

	struct esdhc_platform_data *boarddata = &imx_data->boarddata;



	u32 f_host = clk_get_rate(pltfm_host->clk);



	if (boarddata->f_max && (boarddata->f_max < f_host))

		return boarddata->f_max;

	else

		return f_host;

}



static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)

{

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -447,7 +461,7 @@ static const struct sdhci_ops sdhci_esdhc_ops = { 
	.write_w = esdhc_writew_le,

	.write_b = esdhc_writeb_le,

	.set_clock = esdhc_pltfm_set_clock,

	.get_max_clock = sdhci_pltfm_clk_get_max_clock,

	.get_max_clock = esdhc_pltfm_get_max_clock,

	.get_min_clock = esdhc_pltfm_get_min_clock,

	.get_ro = esdhc_pltfm_get_ro,

	.platform_bus_width = esdhc_pltfm_bus_width,
@@ -490,6 +504,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev, 


	of_property_read_u32(np, "bus-width", &boarddata->max_bus_width);



	of_property_read_u32(np, "max-frequency", &boarddata->f_max);



	return 0;

}

#else

include/linux/platform_data/mmc-esdhc-imx.h

+1 −0
Original line number Diff line number Diff line
@@ -40,5 +40,6 @@ struct esdhc_platform_data { 
	enum wp_types wp_type;

	enum cd_types cd_type;

	int max_bus_width;

	unsigned int f_max;

};

#endif /* __ASM_ARCH_IMX_ESDHC_H */