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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 8 Aug 2018 21:03:31 +0300
Message-ID: <CAHp75Veiop-0xAbs7MtdhOrX_vzDz7v=xAUSDnEhTYVfMovFQA@mail.gmail.com>
Subject: Re: [PATCH 28/28] eeprom: at24: kill at24_platform_data
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>,
        Boris Brezillon <boris.brezillon@bootlin.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>,
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        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>,
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        Linux Documentation List <linux-doc@vger.kernel.org>,
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        Bartosz Golaszewski <bgolaszewski@baylibre.com>
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On Wed, Aug 8, 2018 at 6:31 PM, Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> There are no more users of at24_platform_data. Remove the relevant
> header and modify the driver code to not use it anymore.
>


Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

If you want me to test this on Intel Galileo Gen 2 board, give me a
public tree from where I can pull.
Thanks.

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  MAINTAINERS                        |   1 -
>  drivers/misc/eeprom/at24.c         | 127 +++++++++++++----------------
>  include/linux/platform_data/at24.h |  60 --------------
>  3 files changed, 57 insertions(+), 131 deletions(-)
>  delete mode 100644 include/linux/platform_data/at24.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7cebd5bba8a8..8eb87a3548f8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2328,7 +2328,6 @@ T:        git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
>  S:     Maintained
>  F:     Documentation/devicetree/bindings/eeprom/at24.txt
>  F:     drivers/misc/eeprom/at24.c
> -F:     include/linux/platform_data/at24.h
>
>  ATA OVER ETHERNET (AOE) DRIVER
>  M:     "Ed L. Cashin" <ed.cashin@acm.org>
> diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
> index f5cc517d1131..93642b4b47c5 100644
> --- a/drivers/misc/eeprom/at24.c
> +++ b/drivers/misc/eeprom/at24.c
> @@ -22,10 +22,24 @@
>  #include <linux/i2c.h>
>  #include <linux/nvmem-provider.h>
>  #include <linux/regmap.h>
> -#include <linux/platform_data/at24.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/gpio/consumer.h>
>
> +/* Address pointer is 16 bit. */
> +#define AT24_FLAG_ADDR16       BIT(7)
> +/* sysfs-entry will be read-only. */
> +#define AT24_FLAG_READONLY     BIT(6)
> +/* sysfs-entry will be world-readable. */
> +#define AT24_FLAG_IRUGO                BIT(5)
> +/* Take always 8 addresses (24c00). */
> +#define AT24_FLAG_TAKE8ADDR    BIT(4)
> +/* Factory-programmed serial number. */
> +#define AT24_FLAG_SERIAL       BIT(3)
> +/* Factory-programmed mac address. */
> +#define AT24_FLAG_MAC          BIT(2)
> +/* Does not auto-rollover reads to the next slave address. */
> +#define AT24_FLAG_NO_RDROL     BIT(1)
> +
>  /*
>   * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.
>   * Differences between different vendor product lines (like Atmel AT24C or
> @@ -124,10 +138,6 @@ MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)");
>              usleep_range(1000, 1500), op_time = jiffies)
>
>  struct at24_chip_data {
> -       /*
> -        * these fields mirror their equivalents in
> -        * struct at24_platform_data
> -        */
>         u32 byte_len;
>         u8 flags;
>  };
> @@ -467,46 +477,11 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
>         return 0;
>  }
>
> -static void at24_properties_to_pdata(struct device *dev,
> -                                    struct at24_platform_data *chip)
> -{
> -       int err;
> -       u32 val;
> -
> -       if (device_property_present(dev, "read-only"))
> -               chip->flags |= AT24_FLAG_READONLY;
> -       if (device_property_present(dev, "no-read-rollover"))
> -               chip->flags |= AT24_FLAG_NO_RDROL;
> -
> -       err = device_property_read_u32(dev, "size", &val);
> -       if (!err)
> -               chip->byte_len = val;
> -
> -       err = device_property_read_u32(dev, "pagesize", &val);
> -       if (!err) {
> -               chip->page_size = val;
> -       } else {
> -               /*
> -                * This is slow, but we can't know all eeproms, so we better
> -                * play safe. Specifying custom eeprom-types via platform_data
> -                * is recommended anyhow.
> -                */
> -               chip->page_size = 1;
> -       }
> -}
> -
> -static int at24_get_pdata(struct device *dev, struct at24_platform_data *pdata)
> +static const struct at24_chip_data *at24_get_chip_data(struct device *dev)
>  {
>         struct device_node *of_node = dev->of_node;
>         const struct at24_chip_data *cdata;
>         const struct i2c_device_id *id;
> -       struct at24_platform_data *pd;
> -
> -       pd = dev_get_platdata(dev);
> -       if (pd) {
> -               memcpy(pdata, pd, sizeof(*pdata));
> -               return 0;
> -       }
>
>         id = i2c_match_id(at24_ids, to_i2c_client(dev));
>
> @@ -523,13 +498,9 @@ static int at24_get_pdata(struct device *dev, struct at24_platform_data *pdata)
>                 cdata = acpi_device_get_match_data(dev);
>
>         if (!cdata)
> -               return -ENODEV;
> +               return ERR_PTR(-ENODEV);
>
> -       pdata->byte_len = cdata->byte_len;
> -       pdata->flags = cdata->flags;
> -       at24_properties_to_pdata(dev, pdata);
> -
> -       return 0;
> +       return cdata;
>  }
>
>  static void at24_remove_dummy_clients(struct at24_data *at24)
> @@ -598,8 +569,9 @@ static int at24_probe(struct i2c_client *client)
>  {
>         struct regmap_config regmap_config = { };
>         struct nvmem_config nvmem_config = { };
> -       struct at24_platform_data pdata = { };
> +       const struct at24_chip_data *cdata;
>         struct device *dev = &client->dev;
> +       u32 byte_len, page_size, flags;
>         bool i2c_fn_i2c, i2c_fn_block;
>         unsigned int i, num_addresses;
>         struct at24_data *at24;
> @@ -613,35 +585,54 @@ static int at24_probe(struct i2c_client *client)
>         i2c_fn_block = i2c_check_functionality(client->adapter,
>                                                I2C_FUNC_SMBUS_WRITE_I2C_BLOCK);
>
> -       err = at24_get_pdata(dev, &pdata);
> +       cdata = at24_get_chip_data(dev);
> +       if (IS_ERR(cdata))
> +               return PTR_ERR(cdata);
> +
> +       err = device_property_read_u32(dev, "pagesize", &page_size);
> +       if (err)
> +               /*
> +                * This is slow, but we can't know all eeproms, so we better
> +                * play safe. Specifying custom eeprom-types via platform_data
> +                * is recommended anyhow.
> +                */
> +               page_size = 1;
> +
> +       flags = cdata->flags;
> +       if (device_property_present(dev, "read-only"))
> +               flags |= AT24_FLAG_READONLY;
> +       if (device_property_present(dev, "no-read-rollover"))
> +               flags |= AT24_FLAG_NO_RDROL;
> +
> +       err = device_property_read_u32(dev, "size", &byte_len);
>         if (err)
> -               return err;
> +               byte_len = cdata->byte_len;
>
>         if (!i2c_fn_i2c && !i2c_fn_block)
> -               pdata.page_size = 1;
> +               page_size = 1;
>
> -       if (!pdata.page_size) {
> +       if (!page_size) {
>                 dev_err(dev, "page_size must not be 0!\n");
>                 return -EINVAL;
>         }
>
> -       if (!is_power_of_2(pdata.page_size))
> +       if (!is_power_of_2(page_size))
>                 dev_warn(dev, "page_size looks suspicious (no power of 2)!\n");
>
> -       if (pdata.flags & AT24_FLAG_TAKE8ADDR)
> +       if (flags & AT24_FLAG_TAKE8ADDR)
>                 num_addresses = 8;
>         else
> -               num_addresses = DIV_ROUND_UP(pdata.byte_len,
> -                       (pdata.flags & AT24_FLAG_ADDR16) ? 65536 : 256);
> +               num_addresses = DIV_ROUND_UP(byte_len,
> +                       (flags & AT24_FLAG_ADDR16) ? 65536 : 256);
>
> -       if ((pdata.flags & AT24_FLAG_SERIAL) && (pdata.flags & AT24_FLAG_MAC)) {
> +       if ((flags & AT24_FLAG_SERIAL) && (flags & AT24_FLAG_MAC)) {
>                 dev_err(dev,
>                         "invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");
>                 return -EINVAL;
>         }
>
>         regmap_config.val_bits = 8;
> -       regmap_config.reg_bits = (pdata.flags & AT24_FLAG_ADDR16) ? 16 : 8;
> +       regmap_config.reg_bits = (flags & AT24_FLAG_ADDR16) ? 16 : 8;
>         regmap_config.disable_locking = true;
>
>         regmap = devm_regmap_init_i2c(client, &regmap_config);
> @@ -654,11 +645,11 @@ static int at24_probe(struct i2c_client *client)
>                 return -ENOMEM;
>
>         mutex_init(&at24->lock);
> -       at24->byte_len = pdata.byte_len;
> -       at24->page_size = pdata.page_size;
> -       at24->flags = pdata.flags;
> +       at24->byte_len = byte_len;
> +       at24->page_size = page_size;
> +       at24->flags = flags;
>         at24->num_addresses = num_addresses;
> -       at24->offset_adj = at24_get_offset_adj(pdata.flags, pdata.byte_len);
> +       at24->offset_adj = at24_get_offset_adj(flags, byte_len);
>         at24->client[0].client = client;
>         at24->client[0].regmap = regmap;
>
> @@ -666,10 +657,10 @@ static int at24_probe(struct i2c_client *client)
>         if (IS_ERR(at24->wp_gpio))
>                 return PTR_ERR(at24->wp_gpio);
>
> -       writable = !(pdata.flags & AT24_FLAG_READONLY);
> +       writable = !(flags & AT24_FLAG_READONLY);
>         if (writable) {
>                 at24->write_max = min_t(unsigned int,
> -                                       pdata.page_size, at24_io_limit);
> +                                       page_size, at24_io_limit);
>                 if (!i2c_fn_i2c && at24->write_max > I2C_SMBUS_BLOCK_MAX)
>                         at24->write_max = I2C_SMBUS_BLOCK_MAX;
>         }
> @@ -712,7 +703,7 @@ static int at24_probe(struct i2c_client *client)
>         nvmem_config.priv = at24;
>         nvmem_config.stride = 1;
>         nvmem_config.word_size = 1;
> -       nvmem_config.size = pdata.byte_len;
> +       nvmem_config.size = byte_len;
>
>         at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
>         if (IS_ERR(at24->nvmem)) {
> @@ -721,13 +712,9 @@ static int at24_probe(struct i2c_client *client)
>         }
>
>         dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
> -                pdata.byte_len, client->name,
> +                byte_len, client->name,
>                  writable ? "writable" : "read-only", at24->write_max);
>
> -       /* export data to kernel code */
> -       if (pdata.setup)
> -               pdata.setup(at24->nvmem, pdata.context);
> -
>         return 0;
>
>  err_clients:
> diff --git a/include/linux/platform_data/at24.h b/include/linux/platform_data/at24.h
> deleted file mode 100644
> index 63507ff464ee..000000000000
> --- a/include/linux/platform_data/at24.h
> +++ /dev/null
> @@ -1,60 +0,0 @@
> -/*
> - * at24.h - platform_data for the at24 (generic eeprom) driver
> - * (C) Copyright 2008 by Pengutronix
> - * (C) Copyright 2012 by Wolfram Sang
> - * same license as the driver
> - */
> -
> -#ifndef _LINUX_AT24_H
> -#define _LINUX_AT24_H
> -
> -#include <linux/types.h>
> -#include <linux/nvmem-consumer.h>
> -#include <linux/bitops.h>
> -
> -/**
> - * struct at24_platform_data - data to set up at24 (generic eeprom) driver
> - * @byte_len: size of eeprom in byte
> - * @page_size: number of byte which can be written in one go
> - * @flags: tunable options, check AT24_FLAG_* defines
> - * @setup: an optional callback invoked after eeprom is probed; enables kernel
> -       code to access eeprom via nvmem, see example
> - * @context: optional parameter passed to setup()
> - *
> - * If you set up a custom eeprom type, please double-check the parameters.
> - * Especially page_size needs extra care, as you risk data loss if your value
> - * is bigger than what the chip actually supports!
> - *
> - * An example in pseudo code for a setup() callback:
> - *
> - * void get_mac_addr(struct nvmem_device *nvmem, void *context)
> - * {
> - *     u8 *mac_addr = ethernet_pdata->mac_addr;
> - *     off_t offset = context;
> - *
> - *     // Read MAC addr from EEPROM
> - *     if (nvmem_device_read(nvmem, offset, ETH_ALEN, mac_addr) == ETH_ALEN)
> - *             pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
> - * }
> - *
> - * This function pointer and context can now be set up in at24_platform_data.
> - */
> -
> -struct at24_platform_data {
> -       u32             byte_len;               /* size (sum of all addr) */
> -       u16             page_size;              /* for writes */
> -       u8              flags;
> -#define AT24_FLAG_ADDR16       BIT(7)  /* address pointer is 16 bit */
> -#define AT24_FLAG_READONLY     BIT(6)  /* sysfs-entry will be read-only */
> -#define AT24_FLAG_IRUGO                BIT(5)  /* sysfs-entry will be world-readable */
> -#define AT24_FLAG_TAKE8ADDR    BIT(4)  /* take always 8 addresses (24c00) */
> -#define AT24_FLAG_SERIAL       BIT(3)  /* factory-programmed serial number */
> -#define AT24_FLAG_MAC          BIT(2)  /* factory-programmed mac address */
> -#define AT24_FLAG_NO_RDROL     BIT(1)  /* does not auto-rollover reads to */
> -                                       /* the next slave address */
> -
> -       void            (*setup)(struct nvmem_device *nvmem, void *context);
> -       void            *context;
> -};
> -
> -#endif /* _LINUX_AT24_H */
> --
> 2.18.0
>


-- 
With Best Regards,
Andy Shevchenko