Hi Miquel,
On 17/02/2022 14:47, Christophe Kerello wrote:
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@foss.st.com Cc: stable@vger.kernel.org
There seems to be already an mtd core patch [1] that is planned to go via nvmem tree, do you want me to take 3/4 and 4/4 via nvmem tree as well? Or you can pick up both the series via mtd tree?
Am okay either way.
[1] https://patchwork.kernel.org/project/linux-usb/patch/20220104133843.44272-4-...
--srini
Changes in v3:
- add a fixes tag
- rename skip_wp_gpio by ignore_wp in nvmen_config.
drivers/mtd/mtdcore.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 70f492dce158..eef87b28d6c8 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -546,6 +546,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd) config.stride = 1; config.read_only = true; config.root_only = true;
- config.ignore_wp = true; config.no_of_node = !of_device_is_compatible(node, "nvmem-cells"); config.priv = mtd;
@@ -833,6 +834,7 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, config.owner = THIS_MODULE; config.type = NVMEM_TYPE_OTP; config.root_only = true;
- config.ignore_wp = true; config.reg_read = reg_read; config.size = size; config.of_node = np;