linux-kernel - [PATCH v2 0/4] ARM: dts: at91: Set sst26vf064b SPI NOR flash at its maxumum frequency

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Date:   Tue, 28 Mar 2023 10:07:19 +0000
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com
Cc:     alexandre.belloni@...tlin.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 0/4] ARM: dts: at91: Set sst26vf064b SPI NOR flash at its maxumum frequency

Hi, Nicolas!

I just compiled tested this with sama5_defconfig and at91_dt_defconfig.
Would you please do a simnple test on your side to make sure everything
is in place? A test on a single board would suffice
(maybe sama5d27-wlsom1-ek?):

#!/bin/sh

dd if=/dev/urandom of=./qspi_test bs=1M count=6
mtd_debug write /dev/mtd5 0 6291456 qspi_test
mtd_debug erase /dev/mtd5 0 6291456
mtd_debug read /dev/mtd5 0 6291456 qspi_read
hexdump qspi_read
mtd_debug write /dev/mtd5 0 6291456 qspi_test
mtd_debug read /dev/mtd5 0 6291456 qspi_read
sha1sum qspi_test qspi_read

Cheers,
ta

Changes in v2: update value of spi-cs-setup-ns as it was changed to u32
since the first proposal.
v1 at: https://lore.kernel.org/linux-mtd/20221117105249.115649-1-tudor.ambarus@microchip.com/

---
SPI NOR flashes have specific cs-setup time requirements without which
they can't work at frequencies close to their maximum supported frequency,
as they miss the first bits of the instruction command. Unrecognized
commands are ignored, thus the flash will be unresponsive. Introduce the
spi-cs-setup-ns property to allow spi devices to specify their cs setup
time.

Tudor Ambarus (4):
  ARM: dts: at91-sama5d27_wlsom1: Set sst26vf064b SPI NOR flash at its
    maximum frequency
  ARM: dts: at91-sama5d27_som1: Set sst26vf064b SPI NOR flash at its
    maximum frequency
  ARM: dts: at91: sama5d2_icp: Set sst26vf064b SPI NOR flash at its
    maximum frequency
  ARM: dts: at91: sam9x60ek: Set sst26vf064b SPI NOR flash at its
    maximum frequency

 arch/arm/boot/dts/at91-sam9x60ek.dts        | 3 ++-
 arch/arm/boot/dts/at91-sama5d27_som1.dtsi   | 3 ++-
 arch/arm/boot/dts/at91-sama5d27_wlsom1.dtsi | 3 ++-
 arch/arm/boot/dts/at91-sama5d2_icp.dts      | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

-- 
2.40.0.348.gf938b09366-goog