linux-kernel - Re: [PATCH v3 4/4] mtd: core: Fix a conflict between MTD and NVMEM on wp-gpios property

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Date:   Fri, 18 Feb 2022 14:22:41 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Christophe Kerello <christophe.kerello@...s.st.com>
Cc:     <richard@....at>, <vigneshr@...com>, <robh+dt@...nel.org>,
        <srinivas.kandagatla@...aro.org>, <p.yadav@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>, <chenshumin86@...a.com>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] mtd: core: Fix a conflict between MTD and NVMEM
 on wp-gpios property

Hi Srinivas,

christophe.kerello@...s.st.com wrote on Thu, 17 Feb 2022 15:47:55 +0100:

> Wp-gpios property can be used on NVMEM nodes and the same property can
> be also used on MTD NAND nodes. In case of the wp-gpios property is
> defined at NAND level node, the GPIO management is done at NAND driver
> level. Write protect is disabled when the driver is probed or resumed
> and is enabled when the driver is released or suspended.
> 
> When no partitions are defined in the NAND DT node, then the NAND DT node
> will be passed to NVMEM framework. If wp-gpios property is defined in
> this node, the GPIO resource is taken twice and the NAND controller
> driver fails to probe.
> 
> A new Boolean flag named ignore_wp has been added in nvmem_config.
> In case ignore_wp is set, it means that the GPIO is handled by the
> provider. Lets set this flag in MTD layer to avoid the conflict on
> wp_gpios property.
> 
> Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin")
> Signed-off-by: Christophe Kerello <christophe.kerello@...s.st.com>
> Cc: stable@...r.kernel.org

You can take patches 3 and 4 through the nvmem tree.

Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>

Thanks,
Miquèl