linux-kernel - Re: [PATCH v1] soc: imx: imx8mp-blk-ctrl: Add PCIe SYSPLL configurations

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Message-ID: <20221110071515.GC125525@dragon>
Date:   Thu, 10 Nov 2022 15:15:15 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Lucas Stach <l.stach@...gutronix.de>
Cc:     Richard Zhu <hongxing.zhu@....com>, marex@...x.de,
        tharvey@...eworks.com, vkoul@...nel.org, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, alexander.stein@...tq-group.com,
        richard.leitner@...ux.dev, devicetree@...r.kernel.org,
        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 v1] soc: imx: imx8mp-blk-ctrl: Add PCIe SYSPLL
 configurations

On Tue, Nov 01, 2022 at 09:44:41AM +0100, Lucas Stach wrote:
> Hi Shawn, Richard,
> 
> Am Samstag, dem 29.10.2022 um 16:45 +0800 schrieb Shawn Guo:
> > On Mon, Oct 24, 2022 at 01:43:09PM +0800, Richard Zhu wrote:
> > > Add PCIe SYSPLL configurations, thus the internal SYSPLL can be used as
> > > i.MX8MP PCIe reference clock.
> > > 
> > > The following properties of PHY dts node should be changed accordingly.
> > >   - Set 'fsl,refclk-pad-mode' as '<IMX8_PCIE_REFCLK_PAD_OUTPUT>'.
> > >   - Change 'clocks' to '<&clk IMX8MP_CLK_HSIO_ROOT>'.
> > > 
> > > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > 
> > Applied, thanks!
> 
> Sorry for the late reply, but I'm not really happy with the fact that
> the PLL is now unconditionally enabled, even though it is only needed
> when there is no external reference clock source.
> I fear that this will be hard to correct later on as the DT abstraction
> is wrong, as IMX8MP_CLK_HSIO_ROOT is NOT the reference clock for the
> PHY, but the PLL generated clock, which isn't properly exposed with
> this series.
> 
> I'm not happy to see this going in in the current state and if not too
> late would like to ask Shawn to remove it from the tree again.

Removed.

Shawn