linux-kernel - [PATCH v2 2/2] eeprom: at24: Add support for address-width property

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Message-Id: <1529994128-26770-3-git-send-email-alanx.chiang@intel.com>
Date:   Tue, 26 Jun 2018 14:22:08 +0800
From:   alanx.chiang@...el.com
To:     linux-i2c@...r.kernel.org
Cc:     andy.yeh@...el.com, sakari.ailus@...ux.intel.com,
        andriy.shevchenko@...el.com, rajmohan.mani@...el.com,
        andy.shevchenko@...il.com, brgl@...ev.pl, robh+dt@...nel.org,
        mark.rutland@....com, arnd@...db.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org,
        "alanx.chiang" <alanx.chiang@...el.com>
Subject: [PATCH v2 2/2] eeprom: at24: Add support for address-width property

From: "alanx.chiang" <alanx.chiang@...el.com>

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@...el.com>
Signed-off-by: Andy Yeh <andy.yeh@...el.com>

---
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