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The SJA1110 switch integrates these PHYs, and they do not have support for timestamping. This message becomes quite overwhelming: [ 10.056596] NXP C45 TJA1103 spi1.0-base-t1:01: the phy does not support PTP [ 10.112625] NXP C45 TJA1103 spi1.0-base-t1:02: the phy does not support PTP [ 10.167461] NXP C45 TJA1103 spi1.0-base-t1:03: the phy does not support PTP [ 10.223510] NXP C45 TJA1103 spi1.0-base-t1:04: the phy does not support PTP [ 10.278239] NXP C45 TJA1103 spi1.0-base-t1:05: the phy does not support PTP [ 10.332663] NXP C45 TJA1103 spi1.0-base-t1:06: the phy does not support PTP [ 15.390828] NXP C45 TJA1103 spi1.2-base-t1:01: the phy does not support PTP [ 15.445224] NXP C45 TJA1103 spi1.2-base-t1:02: the phy does not support PTP [ 15.499673] NXP C45 TJA1103 spi1.2-base-t1:03: the phy does not support PTP [ 15.554074] NXP C45 TJA1103 spi1.2-base-t1:04: the phy does not support PTP [ 15.608516] NXP C45 TJA1103 spi1.2-base-t1:05: the phy does not support PTP [ 15.662996] NXP C45 TJA1103 spi1.2-base-t1:06: the phy does not support PTP So reduce its log level to debug. Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.