rtc: zynqmp: Return optional clock lookup errors

devm_clk_get_optional() returns NULL when the optional clock is absent,
but returns an ERR_PTR when the clock provider lookup fails.  Probe
currently keeps the ERR_PTR and then passes it to clk_get_rate().

Return the lookup error instead.  A truly absent optional clock still
reaches the existing calibration fallback through clk_get_rate(NULL).

Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Fixes: 07dcc6f9c762 ("rtc: zynqmp: Add calibration set and get support")
Reviewed-by: Michal Simek <michal.simek@amd.com>
Link: https://patch.msgid.link/20260624055524.38522-1-pengpeng@iscas.ac.cn
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

0 files changed, 0 insertions, 0 deletions