Hi Jaehoon, Am Mittwoch, 2. September 2015, 14:01:52 schrieb Jaehoon Chung: > Hi, Heiko. > > On 09/01/2015 03:24 AM, Heiko Stuebner wrote: > > From: Alexandru M Stan <amstan@xxxxxxxxxxxx> > > > > Add ciu_drv, ciu_sample clocks and default-sample-phase. This will later > > be used by tuning code. > > As i know, ciu_drv and ciu_sample clocks are generated with "ciu" clock. > But in these patch-set, ciu_drv and ciu_sample are controlled by clock > framework. It's a little strange. > Are there ciu_drv and ciu_sample clock on Rockchip? Yes on Rockchip SoCs the drv and sample clock registers are residing inside the clock controller and not in the dw_mmc block. See drivers/clk/rockchip/clk-mmcphase.c and clk-rk3288.c around line 490 . Heiko > > We do not touch ciu_drive (and by extension define default-drive-phase). > > Drive phase is mostly used to define minimum hold times, while one could > > write some code to determine what phase meets the minimum hold time > > (ex 10 degrees) this will not work with the current clock phase framework > > (which floors angles, so we'll get 0 deg, and there's no way to know what > > resolution the floors happen at). We assume that the default drive angles > > set by the hardware are good enough. > > > > Signed-off-by: Alexandru M Stan <amstan@xxxxxxxxxxxx> > > Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> > > --- > > > > Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt | 14 > > ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt > > b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt index > > 346c609..5edadc2 100644 > > --- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt > > +++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt > > > > @@ -42,11 +42,13 @@ Optional properties: > > * clocks: from common clock binding: handle to biu and ciu clocks for the > > > > bus interface unit clock and the card interface unit clock. > > > > -* clock-names: from common clock binding: Shall be "biu" and "ciu". > > - If the biu clock is missing we'll simply skip enabling it. If the > > - ciu clock is missing we'll just assume that the clock is running at > > +* clock-names: from common clock binding: Shall be "biu", "ciu", > > "ciu_drv" and + "ciu_sample". If the biu clock is missing we'll simply > > skip enabling it. + If the ciu clock is missing we'll just assume that > > the clock is running at> > > clock-frequency. It is an error to omit both the ciu clock and the > > > > - clock-frequency. > > + clock-frequency. "ciu_drv" and "ciu_sample" are used to control the > > clock + phases, "ciu_sample" is required for tuning high speed modes (if > > no other + custom tuning method is defined). > > > > * clock-frequency: should be the frequency (in Hz) of the ciu clock. If > > this> > > is specified and the ciu clock is specified then we'll try to set the > > ciu > > > > @@ -75,6 +77,10 @@ Optional properties: > > * vmmc-supply: The phandle to the regulator to use for vmmc. If this is > > > > specified we'll defer probe until we can find this regulator. > > > > +* default-sample-phase: The default phase to set ciu_sample at probing, > > low + speeds or in case where all phases work at tuning time. If not > > specified + 0 deg will be used. > > + > > > > Aliases: > > > > - All the MSHC controller nodes should be represented in the aliases node > > using -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
