linux-kernel - Re: [PATCH V4 1/2] mtd: allow getting MTD device associated with a specific DT node

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Message-ID: <45432169-5f9d-0913-6cf9-06dc821d1c65@pengutronix.de>
Date:   Fri, 17 Jun 2022 09:00:57 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Rafał Miłecki <zajec5@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     Tom Rini <trini@...sulko.com>,
        linux-arm-kernel@...ts.infradead.org, u-boot@...ts.denx.de,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH V4 1/2] mtd: allow getting MTD device associated with a
 specific DT node

On 15.06.22 21:42, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> MTD subsystem API allows interacting with MTD devices (e.g. reading,
> writing, handling bad blocks). So far a random driver could get MTD
> device only by its name (get_mtd_device_nm()). This change allows
> getting them also by a DT node.
> 
> This API is required for drivers handling DT defined MTD partitions in a
> specific way (e.g. U-Boot (sub)partition with environment variables).
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

> ---
> V3: First introduction of of_get_mtd_device_by_node()
> V4: Use EPROBE_DEFER
> 
> Srinivas: in V3 Miquel said it's OK to push this patch through NVMEM 
> ---
>  drivers/mtd/mtdcore.c   | 28 ++++++++++++++++++++++++++++
>  include/linux/mtd/mtd.h |  1 +
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 9eb0680db312..3613cc142f25 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -1154,6 +1154,34 @@ int __get_mtd_device(struct mtd_info *mtd)
>  }
>  EXPORT_SYMBOL_GPL(__get_mtd_device);
>  
> +/**
> + * of_get_mtd_device_by_node - obtain an MTD device associated with a given node
> + *
> + * @np: device tree node
> + */
> +struct mtd_info *of_get_mtd_device_by_node(struct device_node *np)
> +{
> +	struct mtd_info *mtd = NULL;
> +	struct mtd_info *tmp;
> +	int err;
> +
> +	mutex_lock(&mtd_table_mutex);
> +
> +	err = -EPROBE_DEFER;
> +	mtd_for_each_device(tmp) {
> +		if (mtd_get_of_node(tmp) == np) {
> +			mtd = tmp;
> +			err = __get_mtd_device(mtd);
> +			break;
> +		}
> +	}
> +
> +	mutex_unlock(&mtd_table_mutex);
> +
> +	return err ? ERR_PTR(err) : mtd;
> +}
> +EXPORT_SYMBOL_GPL(of_get_mtd_device_by_node);
> +
>  /**
>   *	get_mtd_device_nm - obtain a validated handle for an MTD device by
>   *	device name
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index 955aee14b0f7..6fc841ceef31 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -677,6 +677,7 @@ extern int mtd_device_unregister(struct mtd_info *master);
>  extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
>  extern int __get_mtd_device(struct mtd_info *mtd);
>  extern void __put_mtd_device(struct mtd_info *mtd);
> +extern struct mtd_info *of_get_mtd_device_by_node(struct device_node *np);
>  extern struct mtd_info *get_mtd_device_nm(const char *name);
>  extern void put_mtd_device(struct mtd_info *mtd);
>  


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