DM serial drivers on PowerPC determine their clock frequency via the
get_serial_clock function. This function is not Implemented yet for
MPC83xx.

This patch Implements the function so that DM serial drivers work on
MPC83xx.

Signed-off-by: Mario Six <mario....@gdsys.cc>

---

v2 -> v3:
No changes

v1 -> v2:
New in v2

---
 arch/powerpc/cpu/mpc83xx/speed.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/cpu/mpc83xx/speed.c b/arch/powerpc/cpu/mpc83xx/speed.c
index e870a23103b..e118a10fa8b 100644
--- a/arch/powerpc/cpu/mpc83xx/speed.c
+++ b/arch/powerpc/cpu/mpc83xx/speed.c
@@ -516,6 +516,11 @@ ulong get_ddr_freq(ulong dummy)
        return gd->mem_clk;
 }
 
+int get_serial_clock(void)
+{
+       return get_bus_freq(0);
+}
+
 static int do_clocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
        char buf[32];
-- 
2.20.1

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