linux-kernel - [PATCH v2 1/2] dt-bindings: at24: add new optional power-supply property

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Date:   Mon, 22 Aug 2022 10:58:29 +0000
From:   Eliav Farber <farbere@...zon.com>
To:     <brgl@...ev.pl>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <arnd@...db.de>, <gregkh@...uxfoundation.org>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <farbere@...zon.com>, <talel@...zon.com>, <hhhawa@...zon.com>,
        <jonnyc@...zon.com>, <hanochu@...zon.com>, <ronenk@...zon.com>,
        <itamark@...zon.com>, <shellykz@...zon.com>, <shorer@...zon.com>,
        <amitlavi@...zon.com>, <almogbs@...zon.com>, <dkl@...zon.com>,
        <dwmw@...zon.co.uk>
Subject: [PATCH v2 1/2] dt-bindings: at24: add new optional power-supply property

Boards using the AT24 EEPROMs might have a GPIO that controls the power
supply of the chip, and it must be set to enable the usage of it.

Add a new optional property to the device tree binding document, which
allows to specify a GPIO regulator for the pin that controls the power.

On Linux this means that we need to enable the GPIO at the beginning of
probe function, before trying to access the chip.

Signed-off-by: Eliav Farber <farbere@...zon.com>
---
V1 -> V2:
Change pointed out by Rob Herring:
- Use a gpio regulator for power-supply control.

 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..6d23ceac5fdc 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.
 
+  - power-supply: phandle of the gpio regulator that provides the supply
+                  voltage.
+
   - address-width: number of address bits (one of 8, 16).
 
 Example:
-- 
2.37.1