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Message-ID: <9448dcb4-7eac-7efa-0062-bcc1797fa09d@linaro.org>
Date: Thu, 21 Jul 2022 12:03:37 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Marcus Folkesson <marcus.folkesson@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Maxime Ripard <mripard@...nel.org>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: gpio: fairchild,74hc595: add
strobe-gpios property
On 21/07/2022 11:34, Marcus Folkesson wrote:
> Some shift registers (74hc4094 for example) has a strobe signal to latch
> data from the serial input to the parallel output.
>
> Add an optional strobe-gpios property to support those chips.
>
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> ---
> .../devicetree/bindings/gpio/fairchild,74hc595.yaml | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> index a99e7842ca17..9893df9ae22c 100644
> --- a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> +++ b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> @@ -14,6 +14,8 @@ properties:
> enum:
> - fairchild,74hc595
> - nxp,74lvc594
> + - ti,cd54hc4094
> + - ti,cd74hc4094
>
> reg:
> maxItems: 1
> @@ -33,6 +35,10 @@ properties:
> description: GPIO connected to the OE (Output Enable) pin.
> maxItems: 1
>
> + strobe-gpios:
> + description: GPIO connected to the STROBE pin
> + maxItems: 1
This should be disallowed (in allOf:if:then) for variants which do not
support it (or do not have even STROBE pin).
Best regards,
Krzysztof
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