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Merge branch 'sja1110-doc'

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Vladimir Oltean says:

====================
Document the NXP SJA1110 switch as supported

Now that most of the basic work for SJA1110 support has been done in the
sja1105 DSA driver, let's add the missing documentation bits to make it
clear that the driver can be used.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-06-24 12:55:57 -07:00
commit 98ebad48b8
2 changed files with 63 additions and 6 deletions
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61
Documentation/networking/dsa/sja1105.rst
View File

@ -5,7 +5,7 @@ NXP SJA1105 switch driver
Overview
========
The NXP SJA1105 is a family of 6 devices:
The NXP SJA1105 is a family of 10 SPI-managed automotive switches:
- SJA1105E: First generation, no TTEthernet
- SJA1105T: First generation, TTEthernet
@ -13,9 +13,11 @@ The NXP SJA1105 is a family of 6 devices:
- SJA1105Q: Second generation, TTEthernet, no SGMII
- SJA1105R: Second generation, no TTEthernet, SGMII
- SJA1105S: Second generation, TTEthernet, SGMII
These are SPI-managed automotive switches, with all ports being gigabit
capable, and supporting MII/RMII/RGMII and optionally SGMII on one port.
- SJA1110A: Third generation, TTEthernet, SGMII, integrated 100base-T1 and
100base-TX PHYs
- SJA1110B: Third generation, TTEthernet, SGMII, 100base-T1, 100base-TX
- SJA1110C: Third generation, TTEthernet, SGMII, 100base-T1, 100base-TX
- SJA1110D: Third generation, TTEthernet, SGMII, 100base-T1
Being automotive parts, their configuration interface is geared towards
set-and-forget use, with minimal dynamic interaction at runtime. They
@ -579,3 +581,54 @@ A board would need to hook up the PHYs connected to the switch to any other
MDIO bus available to Linux within the system (e.g. to the DSA master's MDIO
bus). Link state management then works by the driver manually keeping in sync
(over SPI commands) the MAC link speed with the settings negotiated by the PHY.
By comparison, the SJA1110 supports an MDIO slave access point over which its
internal 100base-T1 PHYs can be accessed from the host. This is, however, not
used by the driver, instead the internal 100base-T1 and 100base-TX PHYs are
accessed through SPI commands, modeled in Linux as virtual MDIO buses.
The microcontroller attached to the SJA1110 port 0 also has an MDIO controller
operating in master mode, however the driver does not support this either,
since the microcontroller gets disabled when the Linux driver operates.
Discrete PHYs connected to the switch ports should have their MDIO interface
attached to an MDIO controller from the host system and not to the switch,
similar to SJA1105.
Port compatibility matrix
-------------------------
The SJA1105 port compatibility matrix is:
===== ============== ============== ==============
Port SJA1105E/T SJA1105P/Q SJA1105R/S
===== ============== ============== ==============
0 xMII xMII xMII
1 xMII xMII xMII
2 xMII xMII xMII
3 xMII xMII xMII
4 xMII xMII SGMII
===== ============== ============== ==============
The SJA1110 port compatibility matrix is:
===== ============== ============== ============== ==============
Port SJA1110A SJA1110B SJA1110C SJA1110D
===== ============== ============== ============== ==============
0 RevMII (uC) RevMII (uC) RevMII (uC) RevMII (uC)
1 100base-TX 100base-TX 100base-TX
or SGMII SGMII
2 xMII xMII xMII xMII
or SGMII or SGMII
3 xMII xMII xMII
or SGMII or SGMII SGMII
or 2500base-X or 2500base-X or 2500base-X
4 SGMII SGMII SGMII SGMII
or 2500base-X or 2500base-X or 2500base-X or 2500base-X
5 100base-T1 100base-T1 100base-T1 100base-T1
6 100base-T1 100base-T1 100base-T1 100base-T1
7 100base-T1 100base-T1 100base-T1 100base-T1
8 100base-T1 100base-T1 n/a n/a
9 100base-T1 100base-T1 n/a n/a
10 100base-T1 n/a n/a n/a
===== ============== ============== ============== ==============

8
drivers/net/dsa/sja1105/Kconfig
View File

@ -7,8 +7,8 @@ tristate "NXP SJA1105 Ethernet switch family support"
select PACKING
select CRC32
help
This is the driver for the NXP SJA1105 automotive Ethernet switch
family. These are 5-port devices and are managed over an SPI
This is the driver for the NXP SJA1105 (5-port) and SJA1110 (10-port)
automotive Ethernet switch family. These are managed over an SPI
interface. Probing is handled based on OF bindings and so is the
linkage to PHYLINK. The driver supports the following revisions:
- SJA1105E (Gen. 1, No TT-Ethernet)
@ -17,6 +17,10 @@ tristate "NXP SJA1105 Ethernet switch family support"
- SJA1105Q (Gen. 2, No SGMII, TT-Ethernet)
- SJA1105R (Gen. 2, SGMII, No TT-Ethernet)
- SJA1105S (Gen. 2, SGMII, TT-Ethernet)
- SJA1110A (Gen. 3, SGMII, TT-Ethernet, 100base-TX PHY, 10 ports)
- SJA1110B (Gen. 3, SGMII, TT-Ethernet, 100base-TX PHY, 9 ports)
- SJA1110C (Gen. 3, SGMII, TT-Ethernet, 100base-TX PHY, 7 ports)
- SJA1110D (Gen. 3, SGMII, TT-Ethernet, no 100base-TX PHY, 7 ports)
config NET_DSA_SJA1105_PTP
bool "Support for the PTP clock on the NXP SJA1105 Ethernet switch"