linux-kernel - [PATCH 0/2] spi: cqspi: Fix register reads in STIG Mode

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Message-ID: <20230104062604.1556763-1-d-gole@ti.com>
Date:   Wed, 4 Jan 2023 11:56:02 +0530
From:   Dhruva Gole <d-gole@...com>
To:     <broonie@...nel.org>
CC:     Dhruva Gole <d-gole@...com>, <linux-spi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Vignesh <vigneshr@...com>,
        Pratyush Yadav <pratyush@...nel.org>,
        Vaishnav Achath <vaishnav.a@...com>
Subject: [PATCH 0/2] spi: cqspi: Fix register reads in STIG Mode

Intent of these patches is to fix register reads in STIG mode and also
use STIG mode while reading flash registers.
Currently if you try to read a register while in STIG mode there is no
support for ADDR and thus naturally a register never gets read from the
flash.

Logs demonstrating the usage and working of QSPI-NOR Flash (Cypress
s25hs512t) on a modified AM625 SK EVM can be found on the link below:
https://gist.github.com/DhruvaG2000/a9b90d3d9c60edd3b2d8a360d869a00b

A series very similar to this was also sent to u-boot and the latest
revision can be viewed here:
[PATCH V4 0/2] spi: cqspi: Fix register reads in STIG Mode
https://lore.kernel.org/u-boot/20230103063112.1165898-1-d-gole@ti.com/


Dhruva Gole (2):
  spi: cadence-quadspi: setup ADDR Bits in cmd reads
  spi: cadence-quadspi: use STIG mode for small reads

 drivers/spi/spi-cadence-quadspi.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

-- 
2.25.1