On Fri, 11 May 2012 15:05:23 -0700, David Daney <ddaney.cavm@xxxxxxxxx> wrote:
> From: David Daney <david.daney@xxxxxxxxxx>
>
> We can extract the "pagesize", "size" and "address-width" from the
> device tree so that SPI eeproms can be fully specified in the device
> tree.
>
> Also add a MODULE_DEVICE_TABLE so the drivers can be automatically bound.
>
> Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> Cc: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Axel Lin <axel.lin@xxxxxxxxx>
> ---
> drivers/misc/eeprom/at25.c | 61 +++++++++++++++++++++++++++++++++++++++++---
Documentation on binding? It needs to be there before merging.
g.
> 1 files changed, 57 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
> index 01ab3c9..609ee72 100644
> --- a/drivers/misc/eeprom/at25.c
> +++ b/drivers/misc/eeprom/at25.c
> @@ -16,6 +16,7 @@
> #include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/sched.h>
> +#include <linux/of.h>
>
> #include <linux/spi/spi.h>
> #include <linux/spi/eeprom.h>
> @@ -293,6 +294,9 @@ static int at25_probe(struct spi_device *spi)
> {
> struct at25_data *at25 = NULL;
> const struct spi_eeprom *chip;
> +#ifdef CONFIG_OF
> + struct spi_eeprom of_chip;
> +#endif
> int err;
> int sr;
> int addrlen;
> @@ -300,9 +304,51 @@ static int at25_probe(struct spi_device *spi)
> /* Chip description */
> chip = spi->dev.platform_data;
> if (!chip) {
> - dev_dbg(&spi->dev, "no chip description\n");
> - err = -ENODEV;
> - goto fail;
> +#ifdef CONFIG_OF
> + if (spi->dev.of_node) {
> + u32 val;
> + memset(&of_chip, 0, sizeof(of_chip));
> + if (of_property_read_u32(spi->dev.of_node, "pagesize", &val)) {
> + dev_dbg(&spi->dev, "no \"pagesize\" property\n");
> + err = -ENODEV;
> + goto fail;
> + }
> + of_chip.page_size = val;
> + if (of_property_read_u32(spi->dev.of_node, "size", &val)) {
> + dev_dbg(&spi->dev, "no \"size\" property\n");
> + err = -ENODEV;
> + goto fail;
> + }
> + of_chip.byte_len = val;
> + if (of_property_read_u32(spi->dev.of_node, "address-width", &val)) {
> + dev_dbg(&spi->dev, "no \"address-width\" property\n");
> + err = -ENODEV;
> + goto fail;
> + }
> + switch (val) {
> + case 8:
> + of_chip.flags |= EE_ADDR1;
> + break;
> + case 16:
> + of_chip.flags |= EE_ADDR2;
> + break;
> + case 24:
> + of_chip.flags |= EE_ADDR3;
> + break;
> + default:
> + dev_dbg(&spi->dev, "bad \"address-width\" property: %u\n", val);
> + err = -EINVAL;
> + goto fail;
> + }
> + strlcpy(of_chip.name, spi->dev.of_node->name, sizeof(of_chip.name));
> + chip = &of_chip;
> + } else
> +#endif
> + {
> + dev_dbg(&spi->dev, "no chip description\n");
> + err = -ENODEV;
> + goto fail;
> + }
> }
>
> /* For now we only support 8/16/24 bit addressing */
> @@ -396,11 +442,19 @@ static int __devexit at25_remove(struct spi_device *spi)
>
> /*-------------------------------------------------------------------------*/
>
> +static const struct spi_device_id at25_id[] = {
> + {"at25", 0},
> + {"m95256", 0},
> + { }
> +};
> +MODULE_DEVICE_TABLE(spi, at25_id);
> +
> static struct spi_driver at25_driver = {
> .driver = {
> .name = "at25",
> .owner = THIS_MODULE,
> },
> + .id_table = at25_id,
> .probe = at25_probe,
> .remove = __devexit_p(at25_remove),
> };
> @@ -410,4 +464,3 @@ module_spi_driver(at25_driver);
> MODULE_DESCRIPTION("Driver for most SPI EEPROMs");
> MODULE_AUTHOR("David Brownell");
> MODULE_LICENSE("GPL");
> -MODULE_ALIAS("spi:at25");
> --
> 1.7.2.3
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
