Re: [RFC PATCH] ARM: dts: renesas: r9a06g032-rzn1d400-db: add QSPI node including NOR flash

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hello Wolfram,

On 16/01/2026 at 12:48:48 +01, Wolfram Sang <wsa+renesas@sang-engineering.com> wrote:

> Enable the QSPI controller to access the connected SPI NOR flash. The
> NOR datasheet may suggest faster tuning parameters but those did not
> work on my board.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
>
> Depends on the series "[PATCH v2 00/13] spi: cadence-qspi: Add Renesas
> RZ/N1 support". As this is still under discussion, this patch is RFC
> only.
>
> The tuning values used came from Miquel and work here as well. An
> interested party may try to tune this further but I will go the safe
> route here.

In case you feel adventurous, this paragraph made me remember that I had
noted down some slightly more aggressive values related to the DB board
(which I don't have) in some of my notes. A bit of digging resurrected
the following:

     tshsl-ns = <30>;
     tsd2d-ns = <3>;
     tchsh-ns = <3>;
     tslch-ns = <3>;

Anyhow, thanks for the follow-up patch and thanks for testing.

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Thanks,
Miquèl