linux-kernel - Re: [PATCH v4 1/2] ARM: dts: imx6qp-sabresd: Enable PCIe support

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Message-ID: <20220221083149.GS2249@dragon>
Date:   Mon, 21 Feb 2022 16:31:49 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com
Subject: Re: [PATCH v4 1/2] ARM: dts: imx6qp-sabresd: Enable PCIe support

On Mon, Feb 21, 2022 at 02:33:56PM +0800, Richard Zhu wrote:
> In the i.MX6QP sabresd board(sch-28857) design, one external oscillator
> is powered up by vgen3 and used as the PCIe reference clock source by
> the endpoint device.
> 
> If RC uses this oscillator as reference clock too, PLL6(ENET PLL) would
> has to be in bypass mode, and ENET clocks would be messed up.
> 
> To keep things simple, let RC use the internal PLL as reference clock
> and set vgen3 always on to enable the external oscillator for endpoint
> device on i.MX6QP sabresd board.
> 
> NOTE: This reference clock setup is used to pass the GEN2 TX compliance
> tests, and isn't recommended as a setup in the end-user design.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>

Applied, thanks!