eeprom: at25: allow page sizes greater than 16 bit

Storage technologies like FRAM have no "write pages", the whole chip can
be written within one SPI transfer. For these chips, the page size can
be set equal to the device size. Currently available devices are already
bigger than 64 kiB.

Signed-off-by: Christian Eggers <ceggers@arri.de>
Link: https://lore.kernel.org/r/20200727111218.26926-1-ceggers@arri.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index cde9a2fc1325065b054bf89363f7b568e15145c9..0e7c8dc011952ae0b79215bd3daa3e6ad36d5c29 100644 (file)
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -261,7 +261,7 @@ static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip)
 
        if (device_property_read_u32(dev, "pagesize", &val) == 0 ||
            device_property_read_u32(dev, "at25,page-size", &val) == 0) {
-               chip->page_size = (u16)val;
+               chip->page_size = val;
        } else {
                dev_err(dev, "Error: missing \"pagesize\" property\n");
                return -ENODEV;

diff --git a/include/linux/spi/eeprom.h b/include/linux/spi/eeprom.h
index aceccf9c71fb0ff3cc3ce3bb9fab67cfb5220019..1cca3dd5a748c0b4325dae548fd22c1e97ce71ab 100644 (file)
--- a/include/linux/spi/eeprom.h
+++ b/include/linux/spi/eeprom.h
@@ -14,7 +14,7 @@
 struct spi_eeprom {
        u32             byte_len;
        char            name[10];
-       u16             page_size;              /* for writes */
+       u32             page_size;              /* for writes */
        u16             flags;
 #define        EE_ADDR1        0x0001                  /*  8 bit addrs */
 #define        EE_ADDR2        0x0002                  /* 16 bit addrs */