[RFC,0/4] i2c: core: introduce master_xfer_irqless

To keep the discussion about master_xfer_irqless going, I post here a
draft how I envision the changes to the I2C core. They are only build
tested. I am unsure if I can test them on hardware before next week, so
I'll send them around as RFC already, so people can get an idea and
comment. Maybe Stefan has some bandwidth to test his imx driver
implementation on top of this?

A branch can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/xfer_irqless

Happy hacking and thanks for all the input to this,

   Wolfram


Wolfram Sang (4):
  i2c: core: remove outdated DEBUG output
  i2c: core: remove level of indentation in i2c_transfer
  i2c: core: use I2C locking behaviour also for SMBUS
  i2c: core: introduce master_xfer_irqless callback

 drivers/i2c/i2c-core-base.c  | 44 +++++++++++++-----------------------
 drivers/i2c/i2c-core-smbus.c |  7 +++++-
 drivers/i2c/i2c-core.h       | 12 ++++++++++
 include/linux/i2c.h          | 10 +++++---
 4 files changed, 41 insertions(+), 32 deletions(-)

* Wolfram Sang <wsa+renesas@sang-engineering.com> [180920 09:19]:
> To keep the discussion about master_xfer_irqless going, I post here a
> draft how I envision the changes to the I2C core. They are only build
> tested. I am unsure if I can test them on hardware before next week, so
> I'll send them around as RFC already, so people can get an idea and
> comment. Maybe Stefan has some bandwidth to test his imx driver
> implementation on top of this?
> 
> A branch can be found here:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/xfer_irqless
> 
> Happy hacking and thanks for all the input to this,

Thanks looks nice to me:

Acked-by: Tony Lindgren <tony@atomide.com>

> Thanks looks nice to me:
> 
> Acked-by: Tony Lindgren <tony@atomide.com>

Thanks, Tony!

On Thu, Sep 20, 2018 at 06:14:19PM +0200, Wolfram Sang wrote:
> To keep the discussion about master_xfer_irqless going, I post here a
> draft how I envision the changes to the I2C core. They are only build
> tested. I am unsure if I can test them on hardware before next week, so
> I'll send them around as RFC already, so people can get an idea and
> comment. Maybe Stefan has some bandwidth to test his imx driver
> implementation on top of this?
> 
> A branch can be found here:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/xfer_irqless

What I forgot to mention:

At some point, I'd like an adiitional check if the device is flagged to
have very late I2C transfers and trigger a fat warning if not. To keep
bugs visible.

I have ideas but not perfect yet, so I'll leave this as the next step.

Hi Wolfram,

On Thu, Sep 20, 2018 at 06:14:19PM +0200, Wolfram Sang wrote:
> To keep the discussion about master_xfer_irqless going, I post here a
> draft how I envision the changes to the I2C core. They are only build
> tested. I am unsure if I can test them on hardware before next week, so
> I'll send them around as RFC already, so people can get an idea and
> comment. Maybe Stefan has some bandwidth to test his imx driver
> implementation on top of this?

No problem. I have some spare time in the next days and will post my
results to the mailinglist.

Kind Regards,
Stefan Lengfeld

Hi Wolfram,

I have ported my i.MX6 patches on your patch stack and tested the reboot
handler on my i.MX6 Solo Board.  Works without lockdep and non-atomic
warnings so far.

Kind Regards,
    Stefan


Stefan Christ (1):
  ARM: dts: phyboard-mira-dl: rely on PMIC for reboot and watchdog

Stefan Lengfeld (2):
  i2c: imx: implement master_xfer_irqless callback
  watchdog: da9062: avoid regmap in restart handler

 arch/arm/boot/dts/imx6dl-phytec-mira-rdk-nand.dts |   8 ++
 drivers/i2c/busses/i2c-imx.c                      | 128 ++++++++++++++++------
 drivers/mfd/da9062-core.c                         |   1 +
 drivers/watchdog/da9062_wdt.c                     |  17 ++-
 include/linux/mfd/da9062/core.h                   |   1 +
 5 files changed, 116 insertions(+), 39 deletions(-)

On Friday 21 September 2018 04:26 AM, Wolfram Sang wrote:
> 
>> Thanks looks nice to me:
>>
>> Acked-by: Tony Lindgren <tony@atomide.com>
> 
> Thanks, Tony!

Hi Wolfram Sang,

Posted: https://lore.kernel.org/patchwork/patch/1001457/

Thanks for the series! I tested for poweroff on am572x-idk.

Tested-by: Keerthy <j-keerthy@ti.com>

Regards,
Keerthy
>