arm: dts: u8500: u-boot: Add fixed clock for eMMC

So far there is no need for a clock driver in U-Boot because the
previous boot stage leaves all the necessary clocks on. However,
some drivers in U-Boot (e.g. arm_pl180_mmci) depend on having a clock
driver to obtain the clock frequency.

Setting up the clock drivers properly is a bit tricky on U8500,
so for now add a simple fixed-clock for the eMMC that allows obtaining
the clock frequency. This should be replaced eventually if some board
actually requires enabling some of the clocks.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>

diff --git a/arch/arm/dts/ste-dbx5x0-u-boot.dtsi b/arch/arm/dts/ste-dbx5x0-u-boot.dtsi
index 4a99ee5..e350175 100644 (file)
--- a/arch/arm/dts/ste-dbx5x0-u-boot.dtsi
+++ b/arch/arm/dts/ste-dbx5x0-u-boot.dtsi
@@ -4,8 +4,14 @@
 #include "ste-dbx5x0.dtsi"
 
 / {
+       /* FIXME: Remove this when clk driver is implemented */
+       sdmmcclk: sdmmcclk {
+               compatible = "fixed-clock";
+               #clock-cells = <0>;
+               clock-frequency = <100000000>;
+       };
+
        soc {
-               /* FIXME: Remove this when clk driver is implemented */
                mtu@a03c6000 {
                        clock-frequency = <133000000>;
                };
@@ -18,6 +24,9 @@
                uart@80007000 {
                        clock = <38400000>;
                };
+               mmc@80005000 {
+                       clocks = <&sdmmcclk>;
+               };
        };
 
        reboot {