Re: [PATCH 28/28] eeprom: at24: kill at24_platform_data

Andy Shevchenko
2018-08-08T18:03:38Z

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