linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: use cs-gpios for spi1 on ringneck

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Message-ID: <175127468078.130313.4898907937836060073.b4-ty@sntech.de>
Date: Mon, 30 Jun 2025 11:11:25 +0200
From: Heiko Stuebner <heiko@...ech.de>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Quentin Schulz <quentin.schulz@...rry.de>,
	Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>,
	Lukasz Czechowski <lukasz.czechowski@...umatec.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Johan Jonker <jbx6244@...il.com>,
	Farouk Bouabid <farouk.bouabid@...rry.de>,
	Diederik de Haas <didi.debian@...ow.org>,
	Jakob Unterwurzacher <jakobunt@...il.com>
Cc: Heiko Stuebner <heiko@...ech.de>,
	stable@...r.kernel.org,
	Heiko Stuebner <heiko.stuebner@...rry.de>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: rockchip: use cs-gpios for spi1 on ringneck


On Fri, 27 Jun 2025 15:17:12 +0200, Jakob Unterwurzacher wrote:
> Hardware CS has a very slow rise time of about 6us,
> causing transmission errors when CS does not reach
> high between transaction.
> 
> It looks like it's not driven actively when transitioning
> from low to high but switched to input, so only the CPU
> pull-up pulls it high, slowly. Transitions from high to low
> are fast. On the oscilloscope, CS looks like an irregular sawtooth
> pattern like this:
>                          _____
>               ^         /     |
>       ^      /|        /      |
>      /|     / |       /       |
>     / |    /  |      /        |
> ___/  |___/   |_____/         |___
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: rockchip: use cs-gpios for spi1 on ringneck
      commit: 53b6445ad08f07b6f4a84f1434f543196009ed89

Best regards,
-- 
Heiko Stuebner <heiko@...ech.de>