[RESEND PATCH v4 0/2] Add aproperty in at24.c

[RESEND PATCH v4 0/2] Add aproperty in at24.c

[alanx.chiang]

From: Alan Chiang <alanx.chiang@intel.com>

The RESEND PATCH modifies the commit message and adds the Reviewed-by.

In at24.c, it uses 8-bit addressing by default. In this patch add a
property address-width that provides a flexible method to pass the
information to the driver.

Alan Chiang (2):
  dt-bindings: at24: Add address-width property
  eeprom: at24: Add support for address-width property

 Documentation/devicetree/bindings/eeprom/at24.txt |  2 ++
 drivers/misc/eeprom/at24.c                        | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

-- 
2.7.4

[RESEND PATCH v4 1/2] dt-bindings: at24: Add address-width property

[alanx.chiang]

From: Alan Chiang <alanx.chiang@intel.com>

Currently the only way to use a variant of a supported model with
a different address with a different address width is to define a
new compatible string and the corresponding chip data structure.

Provide a flexible way to specify the size of the address pointer
by defining a new property: address-width.

Signed-off-by: Alan Chiang <alanx.chiang@intel.com>
Signed-off-by: Andy Yeh <andy.yeh@intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/eeprom/at24.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
index 61d833a..aededdb 100644
--- a/Documentation/devicetree/bindings/eeprom/at24.txt
+++ b/Documentation/devicetree/bindings/eeprom/at24.txt
@@ -72,6 +72,8 @@ Optional properties:
 
   - wp-gpios: GPIO to which the write-protect pin of the chip is connected.
 
+  - address-width: number of address bits (one of 8, 16).
+
 Example:
 
 eeprom@52 {
-- 
2.7.4

[RESEND PATCH v4 2/2] eeprom: at24: Add support for address-width property

[alanx.chiang]

From: Alan Chiang <alanx.chiang@intel.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@intel.com>
Signed-off-by: Andy Yeh <andy.yeh@intel.com>
---
 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 0c125f2..7ea640b 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -478,6 +478,23 @@ 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:
+			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, "size", &val);
 	if (!err)
 		chip->byte_len = val;
-- 
2.7.4

Re: [RESEND PATCH v4 1/2] dt-bindings: at24: Add address-width property

[Bartosz Golaszewski]

2018-07-25 5:20 GMT+02:00  <alanx.chiang@intel.com>:
> From: Alan Chiang <alanx.chiang@intel.com>
>
> Currently the only way to use a variant of a supported model with
> a different address with a different address width is to define a

There's some copy-paste problem here. I fixed it.

> new compatible string and the corresponding chip data structure.
>
> Provide a flexible way to specify the size of the address pointer
> by defining a new property: address-width.
>
> Signed-off-by: Alan Chiang <alanx.chiang@intel.com>
> Signed-off-by: Andy Yeh <andy.yeh@intel.com>
> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  Documentation/devicetree/bindings/eeprom/at24.txt | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
> index 61d833a..aededdb 100644
> --- a/Documentation/devicetree/bindings/eeprom/at24.txt
> +++ b/Documentation/devicetree/bindings/eeprom/at24.txt
> @@ -72,6 +72,8 @@ Optional properties:
>
>    - wp-gpios: GPIO to which the write-protect pin of the chip is connected.
>
> +  - address-width: number of address bits (one of 8, 16).
> +
>  Example:
>
>  eeprom@52 {
> --
> 2.7.4
>

Applied both to for-next.

Bart

[RESEND PATCH v4 2/2] eeprom: at24: Add support for address-width property

[alanx.chiang]

From: Alan Chiang <alanx.chiang@intel.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@intel.com>
Signed-off-by: Andy Yeh <andy.yeh@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>

---
since v1
-- Add a warn message for 8-bit addressing.
since v2
-- Modify the warning message for clear.
-- Move the clearing bit operation outside of a statement.
since v3
-- Merge the warning message into one line.

---
 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 0c125f2..7ea640b 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -478,6 +478,23 @@ 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:
+			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, "size", &val);
 	if (!err)
 		chip->byte_len = val;
-- 
2.7.4