On Wed, Jan 10, 2018 at 03:43:41PM +0200, Ilya Ledvich wrote: > Hi Lucas, > > On 01/08/2018 12:43 PM, Lucas Stach wrote: > >Am Donnerstag, den 04.01.2018, 15:52 +0200 schrieb Ilya Ledvich: > >>i.MX7D variant of the IP can use either Crystal Oscillator input > >>or internal clock input as a Reference Clock input for PCIe PHY. > >>Add support for an optional property 'fsl,pcie-phy-refclk-internal'. > >>If present then an internal clock input is used as PCIe PHY > >>reference clock source. By default an external oscillator input > >>is still used. > >> > >>Verified on Compulab SBC-iMX7 Single Board Computer. > > > >Sorry to get in late here, but I would rather have the external clock > >input modeled as a real clock and only use the internal clock if that > >isn't present. > > > > I tried to follow the logic described in the iMX7 TRM, where external > oscillator is a default option. Additionally, the external clock input model > you've suggested, requires additional changes in the iMX7 SabreSD board (and > probably other boards which use an external input too) devicetree files. > > >Are you even sure that the i.MX7 clock you mention isn't the already > >documented "pcie_bus" clock? This one is also allowed to be sourced > >externally on the i.MX6. > > To the best of my understanding it's not the pcie_bus clock, but I'm > absolutely sure. Could anybody from the BSP team guys elaborate on this > issue? Thanks a lot! I have marked this with "Changes Requested" according to Lucas' feedback, please send a new version or let me know what I should do with it, thanks. Lorenzo
