[PATCH net-next v5 0/9] net: dsa: microchip: PTP support for KSZ956x

[Christian Eggers <ceggers@arri.de>]

[1]
http://ww1.microchip.com/downloads/en/DeviceDoc/KSZ9563R-Data-Sheet-DS00002419D.pdf

Changes from v4  --> v5
------------------------
[8/9]            -  Fix compile error reported by kernel test robot
                    (NET_DSA_TAG_KSZ must select NET_PTP_CLASSIFY)

Changes from v3  --> v4
------------------------
The first 2 patches of v3 have been applied.

[ 5/12]-->[ 3/9] - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
[ 6/12]-->[ 4/9] - s/low active/active low/
                 - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
[ 7/12]-->[ 5/9] - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
[ 9/12]-->[ 7/9] - Remove useless case statement
                 - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
[10/12]-->[ 8/9] - s/low active/active low/
                 - 80 chars per line
                 - Use IEEE 802.1AS mode (to suppress forwarding of PDelay messages)
                 - Enable/disable hardware timestaping at runtime (port_hwtstamp_set)
                 - Use mutex in port_hwtstamp_set
                 - Don't use port specific struct hwtstamp_config
                 - removed #ifdefs from tag_ksz.c
                 - Set port's tx_latency and rx_latency to 0
                 - added include/linux/dsa/ksz_common.h to MAINTAINERS
[11/12]          - removed Patch 11/12 (PPS support)
[12/12]-->[ 9/9] - 80 chars per line
                 - reverse christmas tree
                 - Set default pulse width for perout pulse to 50% (max. 125ms)
                 - reject unsupported flags for perout_request


Changes from v2  --> v3
------------------------
Applied all changes requested by Vladimir Oltean. v3 depends on my other
netdev patches from 2020-11-18:
- net: ptp: introduce common defines for PTP message types
- net: dsa: avoid potential use-after-free error

[1/11]-->[1/12]  - dts: remove " OR BSD-2-Clause" from SPDX-License-Identifier
                 - dts: add "additionalProperties"
                 - dts: remove quotes
[2/11]-->[2/12]  - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
[3/11]           - [Patch removed] (split ksz_common.h)
[4/11]-->[3/12]  - Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
                 - fixed summary
[5/11]-->[4/12]  - Use "interrupts-extended" syntax
[6/11]-->[5+6/12] - Split up patch
                 - style fixes
                 - use GENMASK()
                 - IRQF_ONESHOT|IRQF_SHARED
[7/11]-->[7/12]  - Remove "default n" from Kconfig
                 - use mutex in adjfine()
                 - style fixes
[8/11]-->[8/12]  - Be more verbose in commit message
                 - Rename helper
                 - provide correction instead of t2
                 - simplify location of UDP header
[9/11]-->[9+10/12] - Split up patch
                 - Update commmit messages
                 - don't use OR operator on irqreturn_t
                 - spin_lock_irqsave() --> spin_lock_bh()
                 - style fixes
                 - remove rx_filter cases for DELAY_REQ
                 - use new PTP_MSGTYPE_* defines
                 - inline ksz9477_ptp_should_tstamp()
                 - ksz9477_tstamp_to_clock() --> ksz9477_tstamp_reconstruct()
                 - use shared data in include/linux/net/dsa/ksz_common.h
                 - wait for tx time stamp (within sleepable context)
                 - use boolean for tx time stamp enable
                 - move t2 from correction to tail tag (again)
                 - ...

Changes from RFC --> v2
------------------------
I think that all open questions regarding the RFC version could be solved.
dts: referenced to dsa.yaml
dts: changed node name to "switch" in example
dts: changed "ports" subnode to "ethernet-ports"
ksz_common: support "ethernet-ports" subnode
tag_ksz: fix usage of correction field (32 bit ns + 16 bit sub-ns)
tag_ksz: use cached PTP header from device's .port_txtstamp function
tag_ksz: refactored ksz9477_tstamp_to_clock()
tag_ksz: pdelay_req: only subtract 2 bit seconds from the correction field
tag_ksz: pdelay_resp: don't move (negative) correction to the egress tail tag
ptp_classify: add ptp_onestep_p2p_move_t2_to_correction helper
ksz9477_ptp: removed E2E support (as suggested by Vladimir)
ksz9477_ptp: removed master/slave sysfs attributes (nacked by Richard)
ksz9477_ptp: refactored ksz9477_ptp_port_txtstamp
ksz9477_ptp: removed "pulse" attribute
kconfig: depend on PTP_1588_CLOCK (instead of "imply")