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Subject[PATCH v3 0/6] gpio: dwapb: Fix reference clocks usage
From: Serge Semin <>

There is no need in any fixes to have the Baikal-T1 SoC DW GPIO controllers
supported by the kernel DW APB GPIO driver. It works for them just fine with
no modifications. But still there is a room for optimizations there.

First of all as it tends to be traditional for all Baikal-T1 SoC related
patchset we replaced the legacy plain text-based dt-binding file with
yaml-based one. Baikal-T1 DW GPIO port A supports a debounce functionality,
but in order to use it the corresponding reference clock must be enabled.
We added support of that clock in the driver and made sure the dt-bindings
had its declaration. In addition seeing both APB and debounce reference
clocks are optional, we replaced the standard devm_clk_get() usage with
the function of optional clocks acquisition.

This patchset is rebased and tested on the mainline Linux kernel 5.6-rc4:
commit 98d54f81e36b ("Linux 5.6-rc4").

Changelog v2:
- Use a shorter summary describing the DT bindings conversion patch.
- Add myself to the MAINTAINERS file as a maintainer of the DW APB GPIO driver.
- Add myself to the maintainers list of the DW APB GPIO driver DT schema.
- Print error instead of info-message if APB/debounce clocks either
failed to be acquired or couldn't be enabled.
- Rearrange the SoB tags.
- Make sure DT schema defines the lowercase hex numbers in the main dt-node
name and in the sub-node names.
- Use "allOf:" statement to apply uint32 and "minimum/maximum" limitations
on the "snps,nr-gpios" property of the DW APB GPIO DT schema.
- Discard "interrupts-extended" property from the DT schema.
- Make sure the sub-nodes have names with either 'gpio-port' or
'gpio-controller' prefixes.
- Our corporate email server doesn't change Message-Id anymore, so the patchset
is resubmitted being in the cover-letter-threaded format.

Changelog v3:
- Replace S: with M: section entry in the MAINTAINERS file.
- Cc Andy to all patches he isn't added by the auto "cc-cmd" command.

Signed-off-by: Serge Semin <>
Cc: Alexey Malahov <>
Cc: Maxim Kaurkin <>
Cc: Pavel Parkhomenko <>
Cc: Ramil Zaripov <>
Cc: Ekaterina Skachko <>
Cc: Vadim Vlasov <>
Cc: Thomas Bogendoerfer <>
Cc: Paul Burton <>
Cc: Ralf Baechle <>
Cc: Hoan Tran <>
Cc: Linus Walleij <>
Cc: Bartosz Golaszewski <>
Cc: Philipp Zabel <>
Cc: Rob Herring <>
Cc: Mark Rutland <>
Cc: Andy Shevchenko <>,

Serge Semin (6):
dt-bindings: gpio: Convert snps,dw-apb-gpio to DT schema
dt-bindings: gpio: Add DW GPIO debounce clock property
dt-bindings: gpio: Add Sergey Semin to DW APB GPIO driver maintainers
gpio: dwapb: Use optional-clocks interface for APB ref-clock
gpio: dwapb: Add debounce reference clock support
MAINTAINERS: Add Segey Semin to maintainers of DW APB GPIO driver

.../bindings/gpio/snps,dw-apb-gpio.yaml | 134 ++++++++++++++++++
.../bindings/gpio/snps-dwapb-gpio.txt | 65 ---------
drivers/gpio/gpio-dwapb.c | 41 ++++--
4 files changed, 161 insertions(+), 80 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/snps,dw-apb-gpio.yaml
delete mode 100644 Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt


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