On Thu, 12 May 2022 02:17:51 +0300, Serge Semin wrote: > The denoted in the description upper limit only concerns the Port > Multipliers, but not the actual SATA ports. It's an external device > attached to a SATA port in order to access more than one SATA-drive. So > when it's attached to a SATA port it just extends the port capability > while the number of actual SATA ports stays the same. For instance on AHCI > controllers the number of actual ports is determined by the CAP.NP field > and the PI (Ports Implemented) register. AFAICS in general the maximum > number of SATA ports depends on the particular controller implementation. > Generic AHCI controller can't have more than 32 ports (since CAP.NP is of > 5 bits wide and PI register is 32-bits size), while DWC AHCI SATA > controller can't be configured with more than 8 ports activated. So let's > discard the SATA ports reg-property restrictions and just make sure that > it consists of a single reg-item. > > Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> > > --- > > Changelog v2: > - Add comma and replace "channel" with "SATA port" in the reg property > description (@Damien). > --- > Documentation/devicetree/bindings/ata/sata-common.yaml | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
