| From c19378818ac5039ee186d90bc0ed8b0973fb1585 Mon Sep 17 00:00:00 2001 |
| From: Alan Chiang <alanx.chiang@intel.com> |
| Date: Wed, 25 Jul 2018 11:20:22 +0800 |
| Subject: eeprom: at24: Add support for address-width property |
| |
| [ Upstream commit a2b3bf4846e5eed62ea6abb096af2c950961033c ] |
| |
| Provide a flexible way to determine the addressing bits of eeprom. |
| Pass the addressing bits to driver through address-width property. |
| |
| Signed-off-by: Alan Chiang <alanx.chiang@intel.com> |
| Signed-off-by: Andy Yeh <andy.yeh@intel.com> |
| Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| drivers/misc/eeprom/at24.c | 17 +++++++++++++++++ |
| 1 file changed, 17 insertions(+) |
| |
| diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c |
| index 4cc0b42f2acc..ded48a0c77ee 100644 |
| --- a/drivers/misc/eeprom/at24.c |
| +++ b/drivers/misc/eeprom/at24.c |
| @@ -577,6 +577,23 @@ static void at24_get_pdata(struct device *dev, struct at24_platform_data *chip) |
| if (device_property_present(dev, "read-only")) |
| chip->flags |= AT24_FLAG_READONLY; |
| |
| + err = device_property_read_u32(dev, "address-width", &val); |
| + if (!err) { |
| + switch (val) { |
| + case 8: |
| + if (chip->flags & AT24_FLAG_ADDR16) |
| + dev_warn(dev, "Override address width to be 8, while default is 16\n"); |
| + chip->flags &= ~AT24_FLAG_ADDR16; |
| + break; |
| + case 16: |
| + chip->flags |= AT24_FLAG_ADDR16; |
| + break; |
| + default: |
| + dev_warn(dev, "Bad \"address-width\" property: %u\n", |
| + val); |
| + } |
| + } |
| + |
| err = device_property_read_u32(dev, "pagesize", &val); |
| if (!err) { |
| chip->page_size = val; |
| -- |
| 2.17.1 |
| |
