linux-kernel - Re: [PATCH] Revert "nvmem: add new config option"

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Date:   Wed, 4 Oct 2023 10:45:58 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alban Bedel <albeu@...e.fr>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH] Revert "nvmem: add new config option"

Srini,

On 26.08.2023 22:15, Rafał Miłecki wrote:
> On 18.07.2023 10:48, Rafał Miłecki wrote:
>> From: Rafał Miłecki <rafal@...ecki.pl>
>>
>> This reverts commit 517f14d9cf3533d5ab4fded195ab6f80a92e378f.
>>
>> It seems that "no_of_node" config option was added to help mtd's case.
>>
>> DT nodes of MTD partitions (that are also NVMEM devices) may contain
>> subnodes that SHOULD NOT be treated as NVMEM fixed cells. To prevent
>> NVMEM core code from parsing them "no_of_node" was set to true and that
>> made for_each_child_of_node() in NVMEM a no-op.
>>
>> With the introduction of "add_legacy_fixed_of_cells" config option
>> things got more explicit. MTD subsystem simply tells NVMEM when to look
>> for fixed cells and there is no need to hack "of_node" pointer anymore.
>>
>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>> ---
>> Important: this is based on top of the
>> [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells
> 
> I see you skipped those two patches for 6.6.
> 
> Can you queue them for 6.7, please?

Did you have a chance to look at this one?

>> ---
>>   drivers/mtd/mtdcore.c          | 1 -
>>   drivers/nvmem/core.c           | 2 +-
>>   include/linux/nvmem-provider.h | 2 --
>>   3 files changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
>> index 9db8d7853639..3d781ffb8c32 100644
>> --- a/drivers/mtd/mtdcore.c
>> +++ b/drivers/mtd/mtdcore.c
>> @@ -554,7 +554,6 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
>>       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;
>>       mtd->nvmem = nvmem_register(&config);
>> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
>> index 58d8919e6682..a0c9153cda28 100644
>> --- a/drivers/nvmem/core.c
>> +++ b/drivers/nvmem/core.c
>> @@ -1027,7 +1027,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>>       nvmem->nkeepout = config->nkeepout;
>>       if (config->of_node)
>>           nvmem->dev.of_node = config->of_node;
>> -    else if (!config->no_of_node)
>> +    else
>>           nvmem->dev.of_node = config->dev->of_node;
>>       switch (config->id) {
>> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
>> index 1b81adebdb8b..e3930835235b 100644
>> --- a/include/linux/nvmem-provider.h
>> +++ b/include/linux/nvmem-provider.h
>> @@ -89,7 +89,6 @@ struct nvmem_cell_info {
>>    * @read_only:    Device is read-only.
>>    * @root_only:    Device is accessibly to root only.
>>    * @of_node:    If given, this will be used instead of the parent's of_node.
>> - * @no_of_node:    Device should not use the parent's of_node even if it's !NULL.
>>    * @reg_read:    Callback to read data.
>>    * @reg_write:    Callback to write data.
>>    * @size:    Device size.
>> @@ -122,7 +121,6 @@ struct nvmem_config {
>>       bool            ignore_wp;
>>       struct nvmem_layout    *layout;
>>       struct device_node    *of_node;
>> -    bool            no_of_node;
>>       nvmem_reg_read_t    reg_read;
>>       nvmem_reg_write_t    reg_write;
>>       int    size;
>