From: Shawn Guo <shawnguo@kernel.org>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: NXP Linux Team <linux-imx@nxp.com>,
linux-arm-kernel@lists.infradead.org,
Fabio Estevam <festevam@gmail.com>,
kernel@pengutronix.de, patchwork-lst@pengutronix.de
Subject: Re: [PATCH] arm64: dts: imx8mq: assign PCIe clocks
Date: Sun, 23 May 2021 10:45:28 +0800 [thread overview]
Message-ID: <20210523024520.GN8194@dragon> (raw)
In-Reply-To: <20210507221213.166092-1-l.stach@pengutronix.de>
On Sat, May 08, 2021 at 12:12:13AM +0200, Lucas Stach wrote:
> This fixes multiple issues with the current non-existent PCIe clock setup:
>
> The controller can run at up to 250MHz, so use a parent that provides this
> clock.
>
> The PHY needs an exact 100MHz reference clock to function if the PCIe
> refclock is not fed in via the refclock pads. While this mode is not
> supported (yet) in the driver it doesn't hurt to make sure we are
> providing a clock with the right rate.
>
> The AUX clock is specified to have a maximum clock rate of 10MHz. So
> the current setup, which drives it straight from the 25MHz oscillator is
> actually overclocking the AUX input.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Applied, thanks.
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prev parent reply other threads:[~2021-05-23 2:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 22:12 [PATCH] arm64: dts: imx8mq: assign PCIe clocks Lucas Stach
2021-05-23 2:45 ` Shawn Guo [this message]
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