[PATCH v12 02/24] dt-bindings: ufs: mediatek,ufs: Complete the binding

[Rob Herring (Arm)]

On Mon, 14 Sep 2026 13:38:48 +0200, Louis-Alexis Eyraud wrote:
> From: Nicolas Frattaroli <nicolas.frattaroli at collabora.com>
> 
> As it stands, the mediatek,ufs.yaml binding is startlingly incomplete.
> Its one example, which is the only real "user" of this binding in
> mainline, uses the deprecated freq-table-hz property.
> 
> The resets, of which there are three optional ones, are completely
> absent.
> 
> The clock description for MT8195 is incomplete, as is the one for
> MT8192. It's not known if the one clock binding for MT8183 is even
> correct, but I do not have access to the necessary code and
> documentation to find this out myself.
> 
> The power supply situation is not much better; the binding describes one
> required power supply, but it's the UFS card supply, not any of the
> supplies feeding the controller silicon.
> 
> No second example is present in the binding, making verification
> difficult.
> 
> Disallow freq-table-hz and move to operating-points-v2. It's fine to
> break compatibility here, as the binding is currently unused and would
> be impossible to correctly use in its current state.
> 
> Add the three resets and the corresponding reset-names property. These
> resets appear to be optional, i.e. not required for the functioning of
> the device.
> 
> Move the list of clock names out of the if condition, and expand it for
> the confirmed clocks I could find by cross-referencing several clock
> drivers. For MT8195, increase the minimum number of clocks to include
> the rx_symbol ones, as they're internal to the SoC and should always
> be present, and should therefore not be omitted.
> 
> MT8192 gets to have at least 3 clocks, as these were the ones I could
> quickly confirm from a glance at various trees. I can't say this was an
> exhaustive search though, but it's better than the current situation.
> 
> Properly document all supplies, with which pin name on the SoCs they
> supply. Complete the example with them.
> 
> Also add a MT8195 example to the binding, using supply labels that I am
> pretty sure would be the right ones for e.g. the Radxa NIO 12L.
> 
> Finally, remove the 'ufs_' prefix from all clock names containing it
> and rename 'ufs' clock to 'main'.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli at collabora.com>
> Reviewed-by: Chaotian Jing <chaotian.jing at mediatek.com>
> Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud at collabora.com>
> ---
>  .../devicetree/bindings/ufs/mediatek,ufs.yaml      | 115 +++++++++++++++++----
>  1 file changed, 96 insertions(+), 19 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh at kernel.org>