linux.git/drivers/i2c, branch v5.2-rc1

i2c: core: add device-managed version of i2c_new_dummy

2019-05-17T17:29:40+00:00

i2c_new_dummy is typically called from the probe function of the
driver for the primary i2c client. It requires calls to
i2c_unregister_device in the error path of the probe function and
in the remove function.
This can be simplified by introducing a device-managed version.

Note the changed error case return value type: i2c_new_dummy returns
NULL whilst devm_i2c_new_dummy_device returns an ERR_PTR.

Signed-off-by: Heiner Kallweit 
[wsa: rename new functions and fix minor kdoc issues]
Signed-off-by: Wolfram Sang 
Reviewed-by: Peter Rosin 
Reviewed-by: Kieran Bingham 
Reviewed-by: Bartosz Golaszewski 
Signed-off-by: Wolfram Sang

i2c: core: improve return value handling of i2c_new_device and i2c_new_dummy

2019-05-17T17:28:31+00:00

Currently i2c_new_device and i2c_new_dummy return just NULL in error
case although they have more error details internally. Therefore move
the functionality into new functions returning detailed errors and
add wrappers for compatibility with the current API.

This allows to use these functions with detailed error codes within
the i2c core or for API extensions.

Signed-off-by: Heiner Kallweit 
[wsa: rename new functions and fix minor kdoc issues]
Signed-off-by: Wolfram Sang 
Reviewed-by: Peter Rosin 
Reviewed-by: Kieran Bingham 
Reviewed-by: Bartosz Golaszewski 
Signed-off-by: Wolfram Sang

Merge branch 'i2c/for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2019-05-09T21:41:55+00:00

Pull i2c updates from Wolfram Sang:

 - API for late atomic transfers (e.g. to shut down via PMIC). We have a
   seperate callback now which is called under clearly defined
   conditions. In-kernel users are converted, too.

 - new driver for the AMD PCIe MP2 I2C controller

 - large refactoring for at91 and bcm-iproc (both gain slave support due
   to this)

 - and a good share of various driver improvements anf fixes

* 'i2c/for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (57 commits)
  dt-bindings: i2c: riic: document r7s9210 support
  i2c: imx-lpi2c: Use __maybe_unused instead of #if CONFIG_PM_SLEEP
  i2c-piix4: Add Hygon Dhyana SMBus support
  i2c: core: apply 'is_suspended' check for SMBus, too
  i2c: core: ratelimit 'transfer when suspended' errors
  i2c: iproc: Change driver to use 'BIT' macro
  i2c: riic: Add Runtime PM support
  i2c: mux: demux-pinctrl: use struct_size() in devm_kzalloc()
  i2c: mux: pca954x: allow management of device idle state via sysfs
  i2c: mux: pca9541: remove support for unused platform data
  i2c: mux: pca954x: remove support for unused platform data
  dt-bindings: i2c: i2c-mtk: add support for MT8516
  i2c: axxia: use auto cmd for last message
  i2c: gpio: flag atomic capability if possible
  i2c: algo: bit: add flag to whitelist atomic transfers
  i2c: stu300: use xfer_atomic callback to bail out early
  i2c: ocores: enable atomic xfers
  i2c: ocores: refactor setup for polling
  i2c: tegra-bpmp: convert to use new atomic callbacks
  i2c: omap: Add the master_xfer_atomic hook
  ...

Merge tag 'usb-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

2019-05-08T17:03:52+00:00

Pull USB/PHY updates from Greg KH:
 "Here is the big set of USB and PHY driver patches for 5.2-rc1

  There is the usual set of:

   - USB gadget updates

   - PHY driver updates and additions

   - USB serial driver updates and fixes

   - typec updates and new chips supported

   - mtu3 driver updates

   - xhci driver updates

   - other tiny driver updates

  Nothing really interesting, just constant forward progress.

  All of these have been in linux-next for a while with no reported
  issues. The usb-gadget and usb-serial trees were merged a bit "late",
  but both of them had been in linux-next before they got merged here
  last Friday"

* tag 'usb-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (206 commits)
  USB: serial: f81232: implement break control
  USB: serial: f81232: add high baud rate support
  USB: serial: f81232: clear overrun flag
  USB: serial: f81232: fix interrupt worker not stop
  usb: dwc3: Rename DWC3_DCTL_LPM_ERRATA
  usb: dwc3: Fix default lpm_nyet_threshold value
  usb: dwc3: debug: Print GET_STATUS(device) tracepoint
  usb: dwc3: Do core validation early on probe
  usb: dwc3: gadget: Set lpm_capable
  usb: gadget: atmel: tie wake lock to running clock
  usb: gadget: atmel: support USB suspend
  usb: gadget: atmel_usba_udc: simplify setting of interrupt-enabled mask
  dwc2: gadget: Fix completed transfer size calculation in DDMA
  usb: dwc2: Set lpm mode parameters depend on HW configuration
  usb: dwc2: Fix channel disable flow
  usb: dwc2: Set actual frame number for completed ISOC transfer
  usb: gadget: do not use __constant_cpu_to_le16
  usb: dwc2: gadget: Increase descriptors count for ISOC's
  usb: introduce usb_ep_type_string() function
  usb: dwc3: move synchronize_irq() out of the spinlock protected block
  ...

Merge branch 'i2c/for-current-fixed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2019-05-03T18:42:01+00:00

Pull i2c fixes from Wolfram Sang:
 "I2C driver bugfixes and a MAINTAINERS update for you"

* 'i2c/for-current-fixed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: Prevent runtime suspend of adapter when Host Notify is required
  i2c: synquacer: fix enumeration of slave devices
  MAINTAINERS: friendly takeover of i2c-gpio driver
  i2c: designware: ratelimit 'transfer when suspended' errors
  i2c: imx: correct the method of getting private data in notifier_call

Merge 5.1-rc7 into usb-next

2019-05-03T16:03:47+00:00

We need this to make the usb-gadget branch merge cleaner.  And for
testing to keep from hitting the same issues already fixed.

Signed-off-by: Greg Kroah-Hartman

i2c: imx-lpi2c: Use __maybe_unused instead of #if CONFIG_PM_SLEEP

2019-05-03T14:51:38+00:00

Use __maybe_unused for power management related functions
instead of #if CONFIG_PM_SLEEP to simply the code.

Signed-off-by: Anson Huang 
Acked-by: Dong Aisheng 
Signed-off-by: Wolfram Sang

i2c-piix4: Add Hygon Dhyana SMBus support

2019-05-03T14:47:54+00:00

The Hygon Dhyana CPU has the SMBus device with PCI device ID 0x790b,
which is the same as AMD CZ SMBus device. So add Hygon Dhyana support
to the i2c-piix4 driver by using the code path of AMD.

Signed-off-by: Pu Wen 
Reviewed-by: Jean Delvare 
Signed-off-by: Wolfram Sang

i2c: core: apply 'is_suspended' check for SMBus, too

2019-05-03T14:44:51+00:00

We checked I2C calls, but not SMBus. Refactor the helper to an inline
function and use it for both, I2C and SMBus.

Fixes: 9ac6cb5fbb17 ("i2c: add suspended flag and accessors for i2c adapters")
Reported-by: Peter Rosin 
Signed-off-by: Wolfram Sang 
Reviewed-by: Simon Horman 
Signed-off-by: Wolfram Sang

i2c: core: ratelimit 'transfer when suspended' errors

2019-05-03T13:25:00+00:00

There are two problems with WARN_ON() here. One: It is not ratelimited.
Two: We don't see which adapter was used when trying to transfer
something when already suspended. Implement a custom ratelimit once per
adapter and use dev_WARN there. This fixes both issues. Drawback is that
we don't see if multiple drivers are trying to transfer with the same
adapter while suspended. They need to be discovered one after the other
now. This is better than a high CPU load because a really broken driver
might try to resend endlessly.

Fixes: 9ac6cb5fbb17 ("i2c: add suspended flag and accessors for i2c adapters")
Signed-off-by: Wolfram Sang 
Reviewed-by: Simon Horman 
Signed-off-by: Wolfram Sang 
Cc: stable@vger.kernel.org # v5.1+