On 10/14/2014 10:49 PM, Tero Kristo wrote: > On 10/14/2014 01:47 PM, Roger Quadros wrote: >> Hi Tero, >> >> The USB_DPLL doesn't have recommended M/N settings as per the TRM [1] >> Thus the omapconf audit fails. >> >> Any ideas of how we can fix this up? Should we add a new clock.ops structure >> for >> USB_DPLL to make sure that we don't violate the TRM recommended settings? >> or should we just add some flags in dpll_data? We would need a new >> compatible id for sure. >> >> [1] - OMAP4460_ES1.x_NDA_TRM_vP.pdf - 3.6.3.9.5 DPLL_USB Preferred Settings > > The version of TRM I have doesn't have the recommended settings chapter, I > need to download the doc. > > I guess we probably should introduce new fields to the dpll_data for this, > does the TRM list an expected minimum divider / multiplier or just a single > pair of recommended values? Do the other DPLLs have similar values? Looking > at the DM I have here I see a recommended internal reference clock values for > the DPLLs (min/max) and is calculated based on the refclk + N value. >
At least for the USB_DPLL it is single M:N pair for each possible sysclk frequency. For other DPLLs they seem to depend on OPP as well as sys_clk. cheers, -roger >> >> panda4460> omapconf audit dpll -d usb >> |-------------------------------------------------------------------------------------| >> | DPLL_USB AUDIT (@OPP OPP100, sysclk=38.4MHz) | Current Setting | Expected >> | STATUS | >> |-------------------------------------------------------------------------------------| >> | Status | Locked | Locked >> | Pass | >> | Mode | Lock | Lock >> | Pass | >> | Autoidle Mode | Auto LPST | Auto LPST >> | Pass | >> | Low-Power Mode | Disabled | Disabled >> | Pass | >> | REGM4XEN Mode | Disabled | Disabled >> | Pass | >> | DCC Mode | Disabled | Disabled >> | Pass | >> | M Divider | 25 | 400 >> | FAIL | >> | N Divider | 0 | 15 >> | FAIL | >> | Lock Frequency | 960.0MHz | 960.0MHz >> | Pass | >> | M2 Divider | 2 | 2 >> | Pass | >> | CLKOUT Output Rate | 480.0MHz | 480.0MHz >> | Pass | >> | CLKDCOLDO Output Rate | 960.0MHz | 960.0MHz >> | Pass | >> |-------------------------------------------------------------------------------------| >> >> cheers, >> -roger >> > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
