mmc: omap_hsmmc: add DT property for max bus frequency

Maximum bus frequency can be limited by external circuitry like level
shifters etc. Allow passing this value from DT.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 813ae0a..0b5e7ab 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1679,7 +1679,7 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
 {
        struct omap_mmc_platform_data *pdata;
        struct device_node *np = dev->of_node;
-       u32 bus_width;
+       u32 bus_width, max_freq;
 
        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
        if (!pdata)
@@ -1706,6 +1706,9 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
        if (of_find_property(np, "ti,needs-special-reset", NULL))
                pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
 
+       if (!of_property_read_u32(np, "max-frequency", &max_freq))
+               pdata->max_freq = max_freq;
+
        return pdata;
 }
 #else