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Add pinctrl_single driver
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Authored by oskar.holmlund_ohdata.se on Oct 8 2023, 7:50 AM.
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Details

Reviewers
manu
karels
to.karlzon_gmail.com
mmel
Group Reviewers
ARM
Summary

Driver according to sys/contrib/device-tree/Bindings/pinctrl/pinctrl-single.txt

There are still optional properties that is not implemented due to there is not present in any device-tree at all, and some are present but these SoCs (hisilicon, pxa etc) are not supported by the system.

pinctrl_single_pins_write/read handles the different register sizes according to pinctrl-single,register-width DT property. The syscon interface (sys/dev/extres/syscon/syscon_if.m) define only _4 version, should I internally handle the writes according to register-width or should i extend the syscon to _1 _2 versions or a general without specify the size?

Removal of sys/arm/ti/ti_pinmux.c will be handled by the review regarding implementing the device specific gpio driver for the Ti SoC

Test Plan

Its tested on TI AM3358.

Diff Detail

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Event Timeline

manu requested changes to this revision.Oct 8 2023, 2:14 PM
manu added inline comments.
sys/dev/pinctrl/pinctrl_single.c
185

Resources aren't free-ed in the error paths below, better just move this after reading the DT properties

197

syscon_unregister(dev); is missing. Also freeing sys->syscon is needed in the error paths below.

This revision now requires changes to proceed.Oct 8 2023, 2:14 PM

Thank you Manu. Followed your advice to move the bus_alloc_resource/syscon interface to the end of the attach function to avoid complicated error paths.

Looks mostly good to me.

sys/dev/pinctrl/pinctrl_single.c
237

Isn't the syscon needed for configuring pin ?
Should fdt_pinctrl_configure_tree be called after then ?

402

Is there plan to subclass this driver ?
If not no need for DEFINE_CLASS_0 then.

  • Replaced the DEFINE_CLASS_0 -> struct driver_t
  • removed pinctrl_single_pins_write / read
  • update pinctrl_single_syscon_unlocked_write_4/read_4 to honor pinctrl-single,register-width. (even if the functionnames will be misleading and give the impression its an 4byte version of read/write)
  • removed pinctrl_single_syscon_unlocked_modify_4
  • update error handling after fdt_pinctrl_register() call to release syscon in case of failure.

Once again, Thank you Emmanuel for the review!

sys/dev/pinctrl/pinctrl_single.c
385

It might be a little bit to early in BUS_PASS_BUS, maybe BUS_PASS_INTERRUPT or perhaps BUS_PASS_SUPPORTDEV?

manu added inline comments.
sys/dev/pinctrl/pinctrl_single.c
241

I think that syscon interface needs either a syscon_free or syscon_unregister needs to free the resource.
I find it rather ugly that we need to MALLOC_DECLARE and free the resource in a driver.

@kevans @mmel what do you think ?

sys/dev/pinctrl/pinctrl_single.c
241

IMO not syscon_unregister, but a new either syscon_free (or perhaps syscon_destroy for more symmetry with the name create / create_ofw_node)

sys/dev/pinctrl/pinctrl_single.c
241

I'm good with syscon_destroy, can you take care of that Oskar ?