linux-kernel - Re: [PATCH 2/2] ARM: dts: lan966x-pcb8291: Add QSPI0 and SPI NOR memory nodes

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Message-ID: <42c1968a-c966-2104-9e39-f46b491462ca@microchip.com>
Date:   Thu, 7 Apr 2022 12:26:08 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <Kavyasree.Kotagiri@...rochip.com>, <arnd@...db.de>,
        <robh+dt@...nel.org>, <krzk+dt@...nel.org>,
        <alexandre.belloni@...tlin.com>, <olof@...om.net>,
        <soc@...nel.org>, <Nicolas.Ferre@...rochip.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>, <Manohar.Puri@...rochip.com>
Subject: Re: [PATCH 2/2] ARM: dts: lan966x-pcb8291: Add QSPI0 and SPI NOR
 memory nodes

On 4/7/22 13:58, Kavyasree Kotagiri wrote:
> Enable QSPI0 controller and sst26vf016b SPI-NOR flash present on it.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
> ---
>  arch/arm/boot/dts/lan966x-pcb8291.dts | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/lan966x-pcb8291.dts b/arch/arm/boot/dts/lan966x-pcb8291.dts
> index 3281af90ac6d..99d96d46661d 100644
> --- a/arch/arm/boot/dts/lan966x-pcb8291.dts
> +++ b/arch/arm/boot/dts/lan966x-pcb8291.dts
> @@ -62,3 +62,18 @@
>  &watchdog {
>  	status = "okay";
>  };
> +
> +&qspi0 {
> +	status = "okay";
> +
> +	spi-flash@0 {
> +		compatible = "jedec,spi-nor";
> +		reg = <0>;
> +		spi-max-frequency = <20000000>;

You should describe the flash's maximum frequency:
• High-Speed Clock Frequency:
- 2.7V-3.6V: 104 MHz maximum
- 2.3V-3.6V: 80 MHz maximum

https://ww1.microchip.com/downloads/aemDocuments/documents/MPD/ProductDocuments/DataSheets/SST26VF016B-2.5V-3.0V-16-Mbit-Serial-Quad-IO-%28SQI%29-Flash-Memory-20005262G.pdf

> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		spi-tx-bus-width = <4>;
> +		spi-rx-bus-width = <4>;
> +		m25p,fast-read;
> +	};
> +};