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Subject[PATCH 0/4] 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").

Signed-off-by: Serge Semin <>
Signed-off-by: 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 <>

Serge Semin (4):
dt-bindings: gpio: Replace DW APB GPIO legacy bindings with YAML-based
dt-bindings: gpio: Add DW GPIO debounce clocks bindings
gpio: dwapb: Use optional-clocks interface for APB ref-clocks
gpio: dwapb: Add debounce reference clock support

.../bindings/gpio/snps,dw-apb-gpio.yaml | 140 ++++++++++++++++++
.../bindings/gpio/snps-dwapb-gpio.txt | 65 --------
drivers/gpio/gpio-dwapb.c | 41 +++--
3 files changed, 166 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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