Boards using the AT24 EEPROMs might have a GPIO that must be set to
enable the chip (e.g. pin that controls the power supply).
Add a new optional property to the device tree binding document, which
allows to specify the GPIO line to which the enable pin is connected.
On Linux this means that we need to hog the line at the beginning of
probe function.
Signed-off-by: Eliav Farber <[email protected]>
---
Documentation/devicetree/bindings/eeprom/at24.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
index f9a7c984274c..553b53ed3e4c 100644
--- a/Documentation/devicetree/bindings/eeprom/at24.txt
+++ b/Documentation/devicetree/bindings/eeprom/at24.txt
@@ -73,6 +73,9 @@ Optional properties:
- wp-gpios: GPIO to which the write-protect pin of the chip is connected.
+ - enable-gpios: GPIO to enables the chip (e.g. pin that controls the eeprom
+ power supply).
+
- address-width: number of address bits (one of 8, 16).
Example:
--
2.37.1
On Tue, Aug 16, 2022 at 01:00:01PM +0000, Eliav Farber wrote:
> Boards using the AT24 EEPROMs might have a GPIO that must be set to
> enable the chip (e.g. pin that controls the power supply).
>
If this is a power supply control, use a gpio regulator.
> Add a new optional property to the device tree binding document, which
> allows to specify the GPIO line to which the enable pin is connected.
>
> On Linux this means that we need to hog the line at the beginning of
> probe function.
>
> Signed-off-by: Eliav Farber <[email protected]>
> ---
> Documentation/devicetree/bindings/eeprom/at24.txt | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
> index f9a7c984274c..553b53ed3e4c 100644
> --- a/Documentation/devicetree/bindings/eeprom/at24.txt
> +++ b/Documentation/devicetree/bindings/eeprom/at24.txt
> @@ -73,6 +73,9 @@ Optional properties:
>
> - wp-gpios: GPIO to which the write-protect pin of the chip is connected.
>
> + - enable-gpios: GPIO to enables the chip (e.g. pin that controls the eeprom
> + power supply).
> +
> - address-width: number of address bits (one of 8, 16).
>
> Example:
> --
> 2.37.1
>
On 8/18/2022 4:48 AM, Rob Herring wrote:
> If this is a power supply control, use a gpio regulator.
It is indeed a power supply control.
I'll push a new series that uses a gpio regulator.
--
Thanks, Eliav