Re: [PATCH v3 00/12] fw_devlink improvements

[Luca Weiss]

On Tue Feb 7, 2023 at 2:41 AM CET, Saravana Kannan wrote:
> Naresh, Tony, Abel, Geert, Dmitry, Maxim(s), Miquel, Luca, Doug, Martin,
> Jean-Philippe,
>
> Can I get your Tested-by's for this v3 series please?

Hi Saravana,

Seems to be alright on the same platform where it broke previously.

Tested-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx> # qcom/sm7225-fairphone-fp4

Regards
Luca

>
> Vladimir,
>
> Ccing you because DSA's and fw_devlink have known/existing problems
> (still in my TODOs to fix). But I want to make sure this series doesn't
> cause additional problems for DSA.
>
> All,
>
> This patch series improves fw_devlink in the following ways:
>
> 1. It no longer cares about a fwnode having a "compatible" property. It
>    figures this out more dynamically. The only expectation is that
>    fwnodes that are converted to devices actually get probed by a driver
>    for the dependencies to be enforced correctly.
>
> 2. Finer grained dependency tracking. fw_devlink will now create device
>    links from the consumer to the actual resource's device (if it has one,
>    Eg: gpio_device) instead of the parent supplier device. This improves
>    things like async suspend/resume ordering, potentially remove the need
>    for frameworks to create device links, more parallelized async probing,
>    and better sync_state() tracking.
>
> 3. Handle hardware/software quirks where a child firmware node gets
>    populated as a device before its parent firmware node AND actually
>    supplies a non-optional resource to the parent firmware node's
>    device.
>
> 4. Way more robust at cycle handling (see patch for the insane cases).
>
> 5. Stops depending on OF_POPULATED to figure out some corner cases.
>
> 6. Simplifies the work that needs to be done by the firmware specific
>    code.
>
> The v3 series has gone through my usual testing on my end and looks good
> to me.
>
> Thanks,
> Saravana
>
> [1] - https://lore.kernel.org/lkml/20220810060040.321697-1-saravanak@xxxxxxxxxx/
> [2] - https://lore.kernel.org/lkml/CAGETcx-JUV1nj8wBJrTPfyvM7=Mre5j_vkVmZojeiumUGG6QZQ@xxxxxxxxxxxxxx/
>
> v1 -> v2:
> - Fixed Patch 1 to handle a corner case discussed in [2].
> - New patch 10 to handle "fsl,imx8mq-gpc" being initialized by 2 drivers.
> - New patch 11 to add fw_devlink support for SCMI devices.
>
> v2 -> v3:
> - Addressed most of Andy's comments in v2
> - Added Colin and Sudeep's Tested-by for the series (except the imx and
>   renesas patches)
> - Added Sudeep's Acked-by for the scmi patch.
> - Added Geert's Reviewed-by for the renesas patch.
> - Fixed gpiolib crash reported by Naresh.
> - Patch 6: Fix __fwnode_links_move_consumers() to preserve fwnode link flags.
> - New Patch 12 to fix nvmem-cells issue reported by Maxim(s)/Miquel.
> - Deleted some stale function doc in Patch 8
>
> Cc: Abel Vesa <abel.vesa@xxxxxxxxxx>
> Cc: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
> Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Cc: John Stultz <jstultz@xxxxxxxxxx>
> Cc: Doug Anderson <dianders@xxxxxxxxxxxx>
> Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Cc: Maxim Kiselev <bigunclemax@xxxxxxxxx>
> Cc: Maxim Kochetkov <fido_max@xxxxxxxx>
> Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> Cc: Luca Weiss <luca.weiss@xxxxxxxxxxxxx>
> Cc: Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>
> Cc: Martin Kepplinger <martin.kepplinger@xxxxxxx>
> Cc: Jean-Philippe Brucker <jpb@xxxxxxxxxx>
> Cc: Vladimir Oltean <vladimir.oltean@xxxxxxx>
>
> Saravana Kannan (12):
>   driver core: fw_devlink: Don't purge child fwnode's consumer links
>   driver core: fw_devlink: Improve check for fwnode with no
>     device/driver
>   soc: renesas: Move away from using OF_POPULATED for fw_devlink
>   gpiolib: Clear the gpio_device's fwnode initialized flag before adding
>   driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links
>   driver core: fw_devlink: Allow marking a fwnode link as being part of
>     a cycle
>   driver core: fw_devlink: Consolidate device link flag computation
>   driver core: fw_devlink: Make cycle detection more robust
>   of: property: Simplify of_link_to_phandle()
>   irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized
>   firmware: arm_scmi: Set fwnode for the scmi_device
>   mtd: mtdpart: Don't create platform device that'll never probe
>
>  drivers/base/core.c             | 449 +++++++++++++++++++++-----------
>  drivers/firmware/arm_scmi/bus.c |   3 +-
>  drivers/gpio/gpiolib.c          |   7 +
>  drivers/irqchip/irq-imx-gpcv2.c |   1 +
>  drivers/mtd/mtdpart.c           |  10 +
>  drivers/of/property.c           |  84 +-----
>  drivers/soc/imx/gpcv2.c         |   2 +-
>  drivers/soc/renesas/rcar-sysc.c |   2 +-
>  include/linux/device.h          |   1 +
>  include/linux/fwnode.h          |  12 +-
>  10 files changed, 344 insertions(+), 227 deletions(-)
>
> -- 
> 2.39.1.519.gcb327c4b5f-goog