linux-kernel - [PATCH v2 0/2] mtd: core: Handle unsupported OTP operations

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Date: Wed, 13 Mar 2024 19:34:23 +0200
From: Aapo Vienamo <aapo.vienamo@...ux.intel.com>
To: mwalle@...nel.org,
	miquel.raynal@...tlin.com,
	richard@....at,
	vigneshr@...com,
	linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: mika.westerberg@...ux.intel.com,
	Aapo Vienamo <aapo.vienamo@...ux.intel.com>
Subject: [PATCH v2 0/2] mtd: core: Handle unsupported OTP operations

Make MTD core tolerate SPI controllers without OTP support.

These changes address the issue that occurs when an OTP capable
SPI NOR device is initialized with the Intel SPI controller. The limited
supported opcode set of the SPI controller leads to failure in the OTP
initialization, which in turn fails the probe for the MTD device. By
allowing the MTD core to tolerate unsupported OTP, the rest of the MTD
functionality remains intact even if OTP initialization is unsupported.

v2 changes:
 - Move handling of -EOPNOTSUPP to mtd_otp_nvmem_add()
 - Omit error message if -EOPNOTSUPP is returned 

Aapo Vienamo (2):
  mtd: core: Report error if first mtd_otp_size() call fails in
    mtd_otp_nvmem_add()
  mtd: core: Don't fail mtd_otp_nvmem_add() if OTP is unsupported

 drivers/mtd/mtdcore.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

-- 
2.41.0