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Message-ID: <f6b8d9bc-d95a-4d85-a2bc-820b1206fcaf@linaro.org>
Date: Mon, 11 Mar 2024 14:06:10 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>,
Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, Vaishnav Achath <vaishnav.a@...com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>
Cc: linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
Gregory CLEMENT <gregory.clement@...tlin.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 11/11] MIPS: mobileye: eyeq5: add octal flash node to eval
board DTS
On 3/8/24 17:18, Théo Lebrun wrote:
> Add SPI-NOR octal flash node to evaluation board devicetree.
>
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
> arch/mips/boot/dts/mobileye/eyeq5-epm5.dts | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/arch/mips/boot/dts/mobileye/eyeq5-epm5.dts b/arch/mips/boot/dts/mobileye/eyeq5-epm5.dts
> index 6898b2d8267d..0e5fee7b680c 100644
> --- a/arch/mips/boot/dts/mobileye/eyeq5-epm5.dts
> +++ b/arch/mips/boot/dts/mobileye/eyeq5-epm5.dts
> @@ -21,3 +21,18 @@ memory@0 {
> <0x8 0x02000000 0x0 0x7E000000>;
> };
> };
> +
> +&ospi {
> + flash0: flash@0 {
> + compatible = "jedec,spi-nor";
> + reg = <0>; /* chip select */
> +
> + spi-max-frequency = <40000000>;
> + spi-rx-bus-width = <8>;
> + cdns,read-delay = <1>;
> + cdns,tshsl-ns = <400>;
> + cdns,tsd2d-ns = <400>;
> + cdns,tchsh-ns = <125>;
> + cdns,tslch-ns = <50>;
These cdns properties look bad, they bypass SPI NOR entirely. I'd check
if these timings can be determined at SFDP parsing time, then I'd pass
them to the SPI controller.
I see these properties are already accepted in the bindings file for few
years now. Something to improve later on.
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