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

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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>
This commit is contained in:
Stephan Gerhold 2021-08-07 15:07:21 +02:00 • committed by Tom Rini
parent 1ae43a0e23
commit fc9d4b123d
1 changed files with 10 additions and 1 deletions
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11
arch/arm/dts/ste-dbx5x0-u-boot.dtsi
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@ -4,8 +4,14 @@
#include "ste-dbx5x0.dtsi" #include "ste-dbx5x0.dtsi"
/ { / {
/* FIXME: Remove this when clk driver is implemented */
sdmmcclk: sdmmcclk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <100000000>;
};
soc { soc {
/* FIXME: Remove this when clk driver is implemented */
mtu@a03c6000 { mtu@a03c6000 {
clock-frequency = <133000000>; clock-frequency = <133000000>;
}; };
@ -18,6 +24,9 @@
uart@80007000 { uart@80007000 {
clock = <38400000>; clock = <38400000>;
}; };
mmc@80005000 {
clocks = <&sdmmcclk>;
};
}; };
reboot { reboot {