Merge git://git.denx.de/u-boot-rockchip

[people/ms/u-boot.git] / include / dwmmc.h

diff --git a/include/dwmmc.h b/include/dwmmc.h
index 7a7555a73ab2c7a5291b5b2f5ee5e263998d4eae..25cf42c606c993331ee82cfc314df27524b108d3 100644 (file)
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -163,7 +163,21 @@ struct dwmci_host {
 
        void (*clksel)(struct dwmci_host *host);
        void (*board_init)(struct dwmci_host *host);
-       unsigned int (*get_mmc_clk)(struct dwmci_host *host);
+
+       /**
+        * Get / set a particular MMC clock frequency
+        *
+        * This is used to request the current clock frequency of the clock
+        * that drives the DWMMC peripheral. The caller will then use this
+        * information to work out the divider it needs to achieve the
+        * required MMC bus clock frequency. If you want to handle the
+        * clock external to DWMMC, use @freq to select the frequency and
+        * return that value too. Then DWMMC will put itself in bypass mode.
+        *
+        * @host:       DWMMC host
+        * @freq:       Frequency the host is trying to achieve
+        */
+       unsigned int (*get_mmc_clk)(struct dwmci_host *host, uint freq);
 
        struct mmc_config cfg;
 };