From: Boris Brezillon <boris.brezillon@bootlin.com>
To: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Jonathan Corbet <corbet@lwn.net>, Sekhar Nori <nsekhar@ti.com>,
Kevin Hilman <khilman@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Richard Weinberger <richard@nod.at>,
Grygorii Strashko <grygorii.strashko@ti.com>,
"David S . Miller" <davem@davemloft.net>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Naren <naren.kernel@gmail.com>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Lukas Wunner <lukas@wunner.de>,
Dan Carpenter <dan.carpenter@oracle.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>,
Sven Van Asbroeck <svendev@arcx.com>,
Paolo Abeni <pabeni@redhat.com>, Alban Bedel <albeu@free.fr>,
Rob Herring <robh@kernel.org>,
David Lechner <david@lechnology.com>,
Andrew Lunn <andrew@lunn.ch>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org,
netdev@vger.kernel.org,
Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: Re: [PATCH v2 06/29] mtd: Add support for reading MTD devices via the nvmem API
Date: Fri, 17 Aug 2018 18:27:20 +0200 [thread overview]
Message-ID: <20180817182720.6a6e5e8e@bbrezillon> (raw)
In-Reply-To: <20180810080526.27207-7-brgl@bgdev.pl>
Hi Bartosz,
On Fri, 10 Aug 2018 10:05:03 +0200
Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> From: Alban Bedel <albeu@free.fr>
>
> Allow drivers that use the nvmem API to read data stored on MTD devices.
> For this the mtd devices are registered as read-only NVMEM providers.
>
> Signed-off-by: Alban Bedel <albeu@free.fr>
> [Bartosz:
> - use the managed variant of nvmem_register(),
> - set the nvmem name]
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
What happened to the 2 other patches of Alban's series? I'd really like
the DT case to be handled/agreed on in the same patchset, but IIRC,
Alban and Srinivas disagreed on how this should be represented. I
hope this time we'll come to an agreement, because the MTD <-> NVMEM
glue has been floating around for quite some time...
Regards,
Boris
> ---
> drivers/mtd/Kconfig | 1 +
> drivers/mtd/mtdcore.c | 50 +++++++++++++++++++++++++++++++++++++++++
> include/linux/mtd/mtd.h | 2 ++
> 3 files changed, 53 insertions(+)
>
> diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
> index 46ab7feec6b6..f5549482d0df 100644
> --- a/drivers/mtd/Kconfig
> +++ b/drivers/mtd/Kconfig
> @@ -1,5 +1,6 @@
> menuconfig MTD
> tristate "Memory Technology Device (MTD) support"
> + imply NVMEM
> help
> Memory Technology Devices are flash, RAM and similar chips, often
> used for solid state file systems on embedded devices. This option
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 42395df06be9..a57302eaceb5 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -488,6 +488,49 @@ int mtd_pairing_groups(struct mtd_info *mtd)
> }
> EXPORT_SYMBOL_GPL(mtd_pairing_groups);
>
> +static int mtd_nvmem_reg_read(void *priv, unsigned int offset,
> + void *val, size_t bytes)
> +{
> + struct mtd_info *mtd = priv;
> + size_t retlen;
> + int err;
> +
> + err = mtd_read(mtd, offset, bytes, &retlen, val);
> + if (err && err != -EUCLEAN)
> + return err;
> +
> + return retlen == bytes ? 0 : -EIO;
> +}
> +
> +static int mtd_nvmem_add(struct mtd_info *mtd)
> +{
> + struct nvmem_config config = { };
> +
> + config.dev = &mtd->dev;
> + config.owner = THIS_MODULE;
> + config.name = mtd->name;
> + config.reg_read = mtd_nvmem_reg_read;
> + config.size = mtd->size;
> + config.word_size = 1;
> + config.stride = 1;
> + config.read_only = true;
> + config.root_only = true;
> + config.priv = mtd;
> +
> + mtd->nvmem = devm_nvmem_register(&mtd->dev, &config);
> + if (IS_ERR(mtd->nvmem)) {
> + /* Just ignore if there is no NVMEM support in the kernel */
> + if (PTR_ERR(mtd->nvmem) == -ENOSYS) {
> + mtd->nvmem = NULL;
> + } else {
> + dev_err(&mtd->dev, "Failed to register NVMEM device\n");
> + return PTR_ERR(mtd->nvmem);
> + }
> + }
> +
> + return 0;
> +}
> +
> static struct dentry *dfs_dir_mtd;
>
> /**
> @@ -570,6 +613,11 @@ int add_mtd_device(struct mtd_info *mtd)
> if (error)
> goto fail_added;
>
> + /* Add the nvmem provider */
> + error = mtd_nvmem_add(mtd);
> + if (error)
> + goto fail_nvmem_add;
> +
> if (!IS_ERR_OR_NULL(dfs_dir_mtd)) {
> mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(&mtd->dev), dfs_dir_mtd);
> if (IS_ERR_OR_NULL(mtd->dbg.dfs_dir)) {
> @@ -595,6 +643,8 @@ int add_mtd_device(struct mtd_info *mtd)
> __module_get(THIS_MODULE);
> return 0;
>
> +fail_nvmem_add:
> + device_unregister(&mtd->dev);
> fail_added:
> of_node_put(mtd_get_of_node(mtd));
> idr_remove(&mtd_idr, i);
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index a86c4fa93115..8121c6582285 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -25,6 +25,7 @@
> #include <linux/notifier.h>
> #include <linux/device.h>
> #include <linux/of.h>
> +#include <linux/nvmem-provider.h>
>
> #include <mtd/mtd-abi.h>
>
> @@ -339,6 +340,7 @@ struct mtd_info {
> struct device dev;
> int usecount;
> struct mtd_debug_info dbg;
> + struct nvmem_device *nvmem;
> };
>
> int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
next prev parent reply other threads:[~2018-08-17 16:27 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-10 8:04 [PATCH v2 00/29] at24: remove at24_platform_data Bartosz Golaszewski
2018-08-10 8:04 ` [PATCH v2 01/29] nvmem: add support for cell lookups Bartosz Golaszewski
2018-08-24 15:08 ` Boris Brezillon
2018-08-24 15:27 ` Andrew Lunn
2018-08-25 6:27 ` Boris Brezillon
2018-08-27 8:56 ` Bartosz Golaszewski
2018-08-27 9:00 ` Boris Brezillon
2018-08-27 13:37 ` Bartosz Golaszewski
2018-08-27 14:01 ` Boris Brezillon
2018-08-28 10:15 ` Srinivas Kandagatla
2018-08-28 11:56 ` Bartosz Golaszewski
2018-08-28 13:45 ` Srinivas Kandagatla
2018-08-28 14:41 ` Bartosz Golaszewski
2018-08-28 14:48 ` Srinivas Kandagatla
2018-08-28 14:53 ` Boris Brezillon
2018-08-28 15:09 ` Srinivas Kandagatla
2018-08-10 8:04 ` [PATCH v2 02/29] Documentation: nvmem: document lookup entries Bartosz Golaszewski
2018-08-31 20:30 ` Brian Norris
2018-09-01 13:11 ` Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 03/29] nvmem: add a notifier chain Bartosz Golaszewski
2018-08-10 8:33 ` Srinivas Kandagatla
2018-08-10 8:05 ` [PATCH v2 04/29] nvmem: provide nvmem_dev_name() Bartosz Golaszewski
2018-08-10 8:10 ` Srinivas Kandagatla
2018-08-10 8:05 ` [PATCH v2 05/29] nvmem: remove the name field from struct nvmem_device Bartosz Golaszewski
2018-08-10 8:33 ` Srinivas Kandagatla
2018-08-10 8:05 ` [PATCH v2 06/29] mtd: Add support for reading MTD devices via the nvmem API Bartosz Golaszewski
2018-08-17 16:27 ` Boris Brezillon [this message]
2018-08-19 11:31 ` Alban
2018-08-19 16:46 ` Boris Brezillon
2018-08-20 10:43 ` Srinivas Kandagatla
2018-08-20 18:20 ` Boris Brezillon
2018-08-20 18:50 ` Bartosz Golaszewski
2018-08-20 19:06 ` Boris Brezillon
2018-08-20 21:27 ` Alban
2018-08-21 5:07 ` Boris Brezillon
2018-08-21 9:50 ` Srinivas Kandagatla
2018-08-21 9:56 ` Boris Brezillon
2018-08-21 10:11 ` Srinivas Kandagatla
2018-08-21 10:43 ` Boris Brezillon
2018-08-21 11:39 ` Alban
2018-08-21 12:00 ` Srinivas Kandagatla
2018-08-21 13:01 ` Boris Brezillon
2018-08-23 10:29 ` Alban
2018-08-24 14:39 ` Boris Brezillon
2018-08-28 10:20 ` Srinivas Kandagatla
2018-08-20 22:53 ` Alban
2018-08-21 5:44 ` Boris Brezillon
2018-08-21 9:38 ` Srinivas Kandagatla
2018-08-21 11:31 ` Boris Brezillon
2018-08-21 13:34 ` Srinivas Kandagatla
2018-08-21 13:37 ` Srinivas Kandagatla
2018-08-21 13:57 ` Boris Brezillon
2018-08-21 12:27 ` Alban
2018-08-21 12:57 ` Boris Brezillon
2018-08-21 13:57 ` Alban
2018-08-21 14:26 ` Boris Brezillon
2018-08-21 14:33 ` Srinivas Kandagatla
2018-08-10 8:05 ` [PATCH v2 07/29] ARM: davinci: dm365-evm: use nvmem lookup for mac address Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 08/29] ARM: davinci: dm644-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 09/29] ARM: davinci: dm646x-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 10/29] ARM: davinci: da830-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 11/29] ARM: davinci: mityomapl138: add nvmem cells lookup entries Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 12/29] ARM: davinci: da850-evm: use nvmem lookup for mac address Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 13/29] ARM: davinci: da850-evm: remove unnecessary include Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 14/29] net: simplify eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10 14:39 ` Andy Shevchenko
2018-08-10 16:17 ` Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 15/29] net: split eth_platform_get_mac_address() into subroutines Bartosz Golaszewski
2018-08-31 19:54 ` Brian Norris
2018-08-10 8:05 ` [PATCH v2 16/29] net: add support for nvmem to eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 17/29] net: davinci_emac: use eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 18/29] ARM: davinci: da850-evm: remove dead MTD code Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 19/29] ARM: davinci: mityomapl138: don't read the MAC address from machine code Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 20/29] ARM: davinci: dm365-evm: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 21/29] ARM: davinci: da830-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 22/29] ARM: davinci: dm644x-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 23/29] ARM: davinci: dm646x-evm: " Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 24/29] ARM: davinci: sffsdr: fix the at24 eeprom device name Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 25/29] ARM: davinci: sffsdr: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 26/29] ARM: davinci: remove dead code related to MAC address reading Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 27/29] ARM: davinci: mityomapl138: use nvmem notifiers Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 28/29] ARM: davinci: mityomapl138: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10 8:05 ` [PATCH v2 29/29] eeprom: at24: kill at24_platform_data Bartosz Golaszewski
2018-08-10 8:41 ` [PATCH v2 00/29] at24: remove at24_platform_data Srinivas Kandagatla
2018-08-31 19:46 ` Brian Norris
2018-10-03 20:15 ` Bartosz Golaszewski
2018-10-03 20:30 ` Lukas Wunner
2018-10-03 21:04 ` Florian Fainelli
2018-10-04 11:06 ` Bartosz Golaszewski
2018-10-04 13:58 ` Arnd Bergmann
2018-10-04 14:35 ` Sowmini Varadhan
2018-10-04 14:38 ` Arnd Bergmann
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