On Mon, Mar 06, 2017 at 01:39:36PM +0000, Piotr Sroka wrote: > Add description of new DLL PHY delays.
For the subject: "dt-bindings: mmc: ..." > > Signed-off-by: Piotr Sroka <[email protected]> > --- > Changes for v2: > - file was created in v2. It was a part of driver source file patch. > - most delays were moved from dts file > to data associated with an SoC specific compatible > - description of delays was updated to be more clearly > --- > .../devicetree/bindings/mmc/sdhci-cadence.txt | 18 > ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt > b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt > index c0f37cb..77c4b99 100644 > --- a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt > +++ b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt > @@ -19,6 +19,23 @@ if supported. See mmc.txt for details. > - mmc-hs400-1_8v > - mmc-hs400-1_2v > > +Some PHY delays can be configured by following properties. > +Each delay property represents the fraction of the clock period. > +The approximate delay value will be > +(<delay property value>/128)*sdmclk_clock_period. > +- phy-dll-delay-sdclk: > + Value of the delay introduced on the sdclk output > + for all modes except HS200, HS400 and HS400_ES. > + Valid range = [0:0x7F]. > +- phy-dll-delay-sdclk-hsmmc: > + Value of the delay introduced on the sdclk output > + for HS200, HS400 and HS400_ES speed modes. > + Valid range = [0:0x7F]. > +- phy-dll-delay-strobe: > + Value of the delay introduced on the dat_strobe input > + used in HS400 / HS400_ES speed modes. > + Valid range = [0:0x7F]. These all vendor prefixes. > + > Example: > emmc: sdhci@5a000000 { > compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc"; > @@ -29,4 +46,5 @@ Example: > mmc-ddr-1_8v; > mmc-hs200-1_8v; > mmc-hs400-1_8v; > + phy-dll-delay-sdclk = <0>; > }; > -- > 2.2.2 >
