[PATCH v10 4/6] clk: Add KUnit tests for assigned-clock-sscs

[Brian Masney]

On Fri, Jun 12, 2026 at 04:46:26PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan at nxp.com>
> 
> Add KUnit test coverage for the assigned-clock-sscs DT property that
> configures spread spectrum on clocks before they are used.
> 
> Extend the existing test infrastructure to support spread spectrum:
> - Add struct clk_spread_spectrum field to clk_dummy_context and a
>   clk_dummy_set_spread_spectrum callback
> - Wire set_spread_spectrum into all dummy clock ops
> - Extend clk_assigned_rates_register_clk and test parameter struct
>   to propagate initial SSCS values
> 
> Add a new separate test suite clk_assigned_sscs with three categories:
> 
>   1. clk_assigned_sscs_assigns_one — verifies that a single
>      assigned-clock-sscs entry correctly configures spread spectrum
>      on one clock, testing both provider and consumer paths
> 
>   2. clk_assigned_sscs_assigns_multiple — verifies that multiple
>      assigned-clock-sscs entries configure spread spectrum on two
>      clocks, testing both provider and consumer paths
> 
>   3. clk_assigned_sscs_skips — verifies that malformed DT properties
>      are correctly skipped without error: missing assigned-clocks,
>      zero-valued SSCS, and null phandles, tested for both provider
>      and consumer scenarios
> 
> New DT overlays are added for all test scenarios:
>   - kunit_clk_assigned_sscs_one{,consumer} — single valid entry
>   - kunit_clk_assigned_sscs_multiple{,consumer} — two valid entries
>   - kunit_clk_assigned_sscs_without{,consumer} — missing assigned-clocks
>   - kunit_clk_assigned_sscs_zero{,consumer} — all-zero SSCS values
>   - kunit_clk_assigned_sscs_null{,consumer} — null phandle
> 
> Co-developed-by: Brian Masney <bmasney at redhat.com>
> Signed-off-by: Brian Masney <bmasney at redhat.com>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>

Looks good to me.

It's probably not appropriate for me to also put a Reviewed-by here.

Brian