On 2/13/26 8:02 AM, Abhinaba Rakshit wrote:

On Thu, Feb 12, 2026 at 12:30:00PM +0100, Konrad Dybcio wrote:

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On 2/11/26 10:47 AM, Abhinaba Rakshit wrote:

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Register optional operation-points-v2 table for ICE device
and aquire its minimum and maximum frequency during ICE
device probe.

[...]

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+	if (!ice->has_opp)
+		return -EOPNOTSUPP;
+
+	/* Clamp the freq to max if target_freq is beyond supported frequencies */
+	if (ice->max_freq && target_freq >= ice->max_freq) {
+		ice_freq = ice->max_freq;
+		goto scale_clock;
+	}
+
+	/* Clamp the freq to min if target_freq is below supported frequencies */
+	if (ice->min_freq && target_freq <= ice->min_freq) {
+		ice_freq = ice->min_freq;
+		goto scale_clock;
+	}

The OPP framework won't let you overclock the ICE if this is what these checks
are about. Plus the clk framework will perform rounding for you too

Right, maybe I can just add a check for 0 freq just to ensure the export API is
not miss used.
Something shown below:

if (!target_freq)
    return -EINVAL;

However, my main concern was for the corner cases, where:
(target_freq > max && ROUND_CEIL)
and
(target_freq < min && ROUND_FLOOR)
In both the cases, the OPP APIs will fail and the clock remains unchanged.

I would argue that's expected behavior, if the requested rate can not
be achieved, the "set_rate"-like function should fail

Hence, I added the checks to make the API as generic/robust as possible.

AFAICT we generally set storage_ctrl_rate == ice_clk_rate with some slight
play, but the latter never goes above the FMAX of the former

For the second case, I'm not sure it's valid. For "find lowest rate" I would
expect find_freq_*ceil*(rate=0). For other cases of scale-down I would expect
that we want to keep the clock at >= (or ideally == )storage_ctrl_clk anyway
so I'm not sure _floor() is useful

Please let me know, your thoughts.

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+
+	switch (flags) {

Are you going to use these flags? Currently they're dead code

I agree, currently they are not used.
However, since its an export API, I want to keep the rounding FLAGS
support as it a common to have rounding flags in clock scaling APIs,
and to support any future use-cases as well.

I think you have a bit of a misconception - yes, this is an export API and
should be designed with the consumers in mind, but then it's consumed by
in-tree modules only ("what's not on the list doesn't exist"), so it's actually
generally *discouraged* (with varying levels of emphasis) to add any code that
is not immediately useful, as these functions can be updated at any point in
time down the line

Konrad