From mboxrd@z Thu Jan 1 00:00:00 1970 From: alanx.chiang@intel.com Subject: [PATCH v2 2/2] eeprom: at24: Add support for address-width property Date: Tue, 26 Jun 2018 14:22:08 +0800 Message-ID: <1529994128-26770-3-git-send-email-alanx.chiang@intel.com> References: <1529994128-26770-1-git-send-email-alanx.chiang@intel.com> Return-path: In-Reply-To: <1529994128-26770-1-git-send-email-alanx.chiang@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-i2c@vger.kernel.org Cc: andy.yeh@intel.com, sakari.ailus@linux.intel.com, andriy.shevchenko@intel.com, rajmohan.mani@intel.com, andy.shevchenko@gmail.com, brgl@bgdev.pl, robh+dt@kernel.org, mark.rutland@arm.com, arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, "alanx.chiang" List-Id: linux-i2c@vger.kernel.org From: "alanx.chiang" 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 Signed-off-by: Andy Yeh --- since v1 -- Add a warn message for 8-bit addressing. --- drivers/misc/eeprom/at24.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 0c125f2..231afcd 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -478,6 +478,22 @@ static void at24_properties_to_pdata(struct device *dev, if (device_property_present(dev, "no-read-rollover")) chip->flags |= AT24_FLAG_NO_RDROL; + err = device_property_read_u32(dev, "address-width", &val); + if (!err) { + switch (val) { + case 8: + chip->flags &= ~AT24_FLAG_ADDR16; + dev_warn(dev, "address-width is 8, clear the ADD16 bit\n"); + 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, "size", &val); if (!err) chip->byte_len = val; -- 2.7.4