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ptp_clock: Allow for it to be optional 

In order to break the hard dependency between the PTP clock subsystem and
ethernet drivers capable of being clock providers, this patch provides
simple PTP stub functions to allow linkage of those drivers into the
kernel even when the PTP subsystem is configured out. Drivers must be
ready to accept NULL from ptp_clock_register() in that case.

And to make it possible for PTP to be configured out, the select statement
in those driver's Kconfig menu entries is converted to the new "imply"
statement. This way the PTP subsystem may have Kconfig dependencies of
its own, such as POSIX_TIMERS, without having to make those ethernet
drivers unavailable if POSIX timers are cconfigured out. And when support
for POSIX timers is selected again then the default config option for PTP
clock support will automatically be adjusted accordingly.

The pch_gbe driver is a bit special as it relies on extra code in
drivers/ptp/ptp_pch.c. Therefore we let the make process descend into
drivers/ptp/ even if PTP_1588_CLOCK is unselected.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: linux-kbuild@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Michal Marek <mmarek@suse.com>
Link: http://lkml.kernel.org/r/1478841010-28605-4-git-send-email-nicolas.pitre@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Nicolas Pitre 2016-11-11 00:10:07 -05:00 committed by Thomas Gleixner
parent 32ce5ac867
commit d1cbfd771c
18 changed files with 69 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/Makefile
View File

@ -107,7 +107,7 @@ obj-$(CONFIG_INPUT) += input/
obj-$(CONFIG_RTC_LIB) += rtc/
obj-y += i2c/ media/
obj-$(CONFIG_PPS) += pps/
obj-$(CONFIG_PTP_1588_CLOCK) += ptp/
obj-y += ptp/
obj-$(CONFIG_W1) += w1/
obj-y += power/
obj-$(CONFIG_HWMON) += hwmon/

2
drivers/net/ethernet/adi/Kconfig
View File

@ -58,7 +58,7 @@ config BFIN_RX_DESC_NUM
config BFIN_MAC_USE_HWSTAMP
bool "Use IEEE 1588 hwstamp"
depends on BFIN_MAC && BF518
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
default y
---help---
To support the IEEE 1588 Precision Time Protocol (PTP), select y here

2
drivers/net/ethernet/amd/Kconfig
View File

@ -177,7 +177,7 @@ config AMD_XGBE
depends on ARM64 || COMPILE_TEST
select BITREVERSE
select CRC32
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports the AMD 10GbE Ethernet device found on an
AMD SoC.

6
drivers/net/ethernet/amd/xgbe/xgbe-main.c
View File

@ -773,7 +773,8 @@ static int xgbe_probe(struct platform_device *pdev)
goto err_wq;
}
xgbe_ptp_register(pdata);
if (IS_REACHABLE(CONFIG_PTP_1588_CLOCK))
xgbe_ptp_register(pdata);
xgbe_debugfs_init(pdata);
@ -812,7 +813,8 @@ static int xgbe_remove(struct platform_device *pdev)
xgbe_debugfs_exit(pdata);
xgbe_ptp_unregister(pdata);
if (IS_REACHABLE(CONFIG_PTP_1588_CLOCK))
xgbe_ptp_unregister(pdata);
flush_workqueue(pdata->an_workqueue);
destroy_workqueue(pdata->an_workqueue);

4
drivers/net/ethernet/broadcom/Kconfig
View File

@ -110,7 +110,7 @@ config TIGON3
depends on PCI
select PHYLIB
select HWMON
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports Broadcom Tigon3 based gigabit Ethernet cards.
@ -120,7 +120,7 @@ config TIGON3
config BNX2X
tristate "Broadcom NetXtremeII 10Gb support"
depends on PCI
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
select FW_LOADER
select ZLIB_INFLATE
select LIBCRC32C

2
drivers/net/ethernet/cavium/Kconfig
View File

@ -53,7 +53,7 @@ config THUNDER_NIC_RGX
config LIQUIDIO
tristate "Cavium LiquidIO support"
depends on 64BIT
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
select FW_LOADER
select LIBCRC32C
---help---

2
drivers/net/ethernet/freescale/Kconfig
View File

@ -25,7 +25,7 @@ config FEC
ARCH_MXC || SOC_IMX28)
default ARCH_MXC || SOC_IMX28 if ARM
select PHYLIB
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
Say Y here if you want to use the built-in 10/100 Fast ethernet
controller on some Motorola ColdFire and Freescale i.MX processors.

10
drivers/net/ethernet/intel/Kconfig
View File

@ -58,7 +58,7 @@ config E1000E
tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
depends on PCI && (!SPARC32 || BROKEN)
select CRC32
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports the PCI-Express Intel(R) PRO/1000 gigabit
ethernet family of adapters. For PCI or PCI-X e1000 adapters,
@ -83,7 +83,7 @@ config E1000E_HWTS
config IGB
tristate "Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support"
depends on PCI
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
select I2C
select I2C_ALGOBIT
---help---
@ -156,7 +156,7 @@ config IXGBE
tristate "Intel(R) 10GbE PCI Express adapters support"
depends on PCI
select MDIO
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports Intel(R) 10GbE PCI Express family of
adapters. For more information on how to identify your adapter, go
@ -213,7 +213,7 @@ config IXGBEVF
config I40E
tristate "Intel(R) Ethernet Controller XL710 Family support"
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
depends on PCI
---help---
This driver supports Intel(R) Ethernet Controller XL710 Family of
@ -264,7 +264,7 @@ config FM10K
tristate "Intel(R) FM10000 Ethernet Switch Host Interface Support"
default n
depends on PCI_MSI
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports Intel(R) FM10000 Ethernet Switch Host
Interface. For more information on how to identify your adapter,

2
drivers/net/ethernet/mellanox/mlx4/Kconfig
View File

@ -7,7 +7,7 @@ config MLX4_EN
depends on MAY_USE_DEVLINK
depends on PCI
select MLX4_CORE
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports Mellanox Technologies ConnectX Ethernet
devices.

2
drivers/net/ethernet/mellanox/mlx5/core/Kconfig
View File

@ -14,7 +14,7 @@ config MLX5_CORE
config MLX5_CORE_EN
bool "Mellanox Technologies ConnectX-4 Ethernet support"
depends on NETDEVICES && ETHERNET && PCI && MLX5_CORE
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
default n
---help---
Ethernet support in Mellanox Technologies ConnectX-4 NIC.

2
drivers/net/ethernet/renesas/Kconfig
View File

@ -37,7 +37,7 @@ config RAVB
select MII
select MDIO_BITBANG
select PHYLIB
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
help
Renesas Ethernet AVB device driver.
This driver supports the following SoCs:

2
drivers/net/ethernet/samsung/Kconfig
View File

@ -21,7 +21,7 @@ config SXGBE_ETH
depends on HAS_IOMEM && HAS_DMA
select PHYLIB
select CRC32
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This is the driver for the SXGBE 10G Ethernet IP block found on
Samsung platforms.

2
drivers/net/ethernet/sfc/Kconfig
View File

@ -5,7 +5,7 @@ config SFC
select CRC32
select I2C
select I2C_ALGOBIT
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports 10/40-gigabit Ethernet cards based on
the Solarflare SFC4000, SFC9000-family and SFC9100-family

2
drivers/net/ethernet/stmicro/stmmac/Kconfig
View File

@ -4,7 +4,7 @@ config STMMAC_ETH
select MII
select PHYLIB
select CRC32
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
select RESET_CONTROLLER
---help---
This is the driver for the Ethernet IPs are built around a

2
drivers/net/ethernet/ti/Kconfig
View File

@ -76,7 +76,7 @@ config TI_CPSW
config TI_CPTS
bool "TI Common Platform Time Sync (CPTS) Support"
depends on TI_CPSW
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
---help---
This driver supports the Common Platform Time Sync unit of
the CPSW Ethernet Switch. The unit can time stamp PTP UDP/IPv4

2
drivers/net/ethernet/tile/Kconfig
View File

@ -9,7 +9,7 @@ config TILE_NET
select CRC32
select TILE_GXIO_MPIPE if TILEGX
select HIGH_RES_TIMERS if TILEGX
select PTP_1588_CLOCK if TILEGX
imply PTP_1588_CLOCK if TILEGX
---help---
This is a standard Linux network device driver for the
on-chip Tilera Gigabit Ethernet and XAUI interfaces.

8
drivers/ptp/Kconfig
View File

@ -28,7 +28,7 @@ config PTP_1588_CLOCK
config PTP_1588_CLOCK_GIANFAR
tristate "Freescale eTSEC as PTP clock"
depends on GIANFAR
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
default y
help
This driver adds support for using the eTSEC as a PTP
@ -42,7 +42,7 @@ config PTP_1588_CLOCK_GIANFAR
config PTP_1588_CLOCK_IXP46X
tristate "Intel IXP46x as PTP clock"
depends on IXP4XX_ETH
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
default y
help
This driver adds support for using the IXP46X as a PTP
@ -60,7 +60,7 @@ config DP83640_PHY
tristate "Driver for the National Semiconductor DP83640 PHYTER"
depends on NETWORK_PHY_TIMESTAMPING
depends on PHYLIB
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
---help---
Supports the DP83640 PHYTER with IEEE 1588 features.
@ -76,7 +76,7 @@ config PTP_1588_CLOCK_PCH
tristate "Intel PCH EG20T as PTP clock"
depends on X86_32 || COMPILE_TEST
depends on HAS_IOMEM && NET
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
help
This driver adds support for using the PCH EG20T as a PTP
clock. The hardware supports time stamping of PTP packets

65
include/linux/ptp_clock_kernel.h
View File

@ -122,30 +122,6 @@ struct ptp_clock_info {
struct ptp_clock;
/**
* ptp_clock_register() - register a PTP hardware clock driver
*
* @info: Structure describing the new clock.
* @parent: Pointer to the parent device of the new clock.
*
* Returns a valid pointer on success or PTR_ERR on failure. If PHC
* support is missing at the configuration level, this function
* returns NULL, and drivers are expected to gracefully handle that
* case separately.
*/
extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent);
/**
* ptp_clock_unregister() - unregister a PTP hardware clock driver
*
* @ptp: The clock to remove from service.
*/
extern int ptp_clock_unregister(struct ptp_clock *ptp);
enum ptp_clock_events {
PTP_CLOCK_ALARM,
PTP_CLOCK_EXTTS,
@ -171,6 +147,31 @@ struct ptp_clock_event {
};
};
#if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
/**
* ptp_clock_register() - register a PTP hardware clock driver
*
* @info: Structure describing the new clock.
* @parent: Pointer to the parent device of the new clock.
*
* Returns a valid pointer on success or PTR_ERR on failure. If PHC
* support is missing at the configuration level, this function
* returns NULL, and drivers are expected to gracefully handle that
* case separately.
*/
extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent);
/**
* ptp_clock_unregister() - unregister a PTP hardware clock driver
*
* @ptp: The clock to remove from service.
*/
extern int ptp_clock_unregister(struct ptp_clock *ptp);
/**
* ptp_clock_event() - notify the PTP layer about an event
*
@ -202,4 +203,20 @@ extern int ptp_clock_index(struct ptp_clock *ptp);
int ptp_find_pin(struct ptp_clock *ptp,
enum ptp_pin_function func, unsigned int chan);
#else
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
{ return NULL; }
static inline int ptp_clock_unregister(struct ptp_clock *ptp)
{ return 0; }
static inline void ptp_clock_event(struct ptp_clock *ptp,
struct ptp_clock_event *event)
{ }
static inline int ptp_clock_index(struct ptp_clock *ptp)
{ return -1; }
static inline int ptp_find_pin(struct ptp_clock *ptp,
enum ptp_pin_function func, unsigned int chan)
{ return -1; }
#endif
#endif