The I2C controllers in most Rockchip SoCs are part of power domains that
are always powered on, i.e. PD_BUS or PD_PMU. These always powered
on power domains have typically not been described in the device tree.

Because these power domains have been left out of the device tree there
has not been any real need to properly describe the I2C controllers
power domain.

On RK3528 the I2C controllers are spread out among the described
PD_RKVENC, PD_VO and PD_VPU power domains. However, one I2C controller
belong to an undescribed always powered on power domain.

Add support to describe an optional power-domains for the I2C
controllers in Rockchip SoCs.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
v2: Update commit message
---
 Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml b/Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml
index 2f1e97969c3f..4ac5a40a3886 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml
+++ b/Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml
@@ -105,6 +105,9 @@ properties:
       (t(f) in the I2C specification). If not specified we will use the SCL
       value since they are the same in nearly all cases.
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg
-- 
2.50.1

Hi Jonas,

On Wed, Jul 23, 2025 at 08:56:44AM +0000, Jonas Karlman wrote:
> The I2C controllers in most Rockchip SoCs are part of power domains that
> are always powered on, i.e. PD_BUS or PD_PMU. These always powered
> on power domains have typically not been described in the device tree.
> 
> Because these power domains have been left out of the device tree there
> has not been any real need to properly describe the I2C controllers
> power domain.
> 
> On RK3528 the I2C controllers are spread out among the described
> PD_RKVENC, PD_VO and PD_VPU power domains. However, one I2C controller
> belong to an undescribed always powered on power domain.
> 
> Add support to describe an optional power-domains for the I2C
> controllers in Rockchip SoCs.
> 
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>

merged to i2c/i2c-host.

Thanks,
Andi

On Wed, 23 Jul 2025 08:56:44 +0000, Jonas Karlman wrote:
> The I2C controllers in most Rockchip SoCs are part of power domains that
> are always powered on, i.e. PD_BUS or PD_PMU. These always powered
> on power domains have typically not been described in the device tree.
> 
> Because these power domains have been left out of the device tree there
> has not been any real need to properly describe the I2C controllers
> power domain.
> 
> On RK3528 the I2C controllers are spread out among the described
> PD_RKVENC, PD_VO and PD_VPU power domains. However, one I2C controller
> belong to an undescribed always powered on power domain.
> 
> Add support to describe an optional power-domains for the I2C
> controllers in Rockchip SoCs.
> 
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
> v2: Update commit message
> ---
>  Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml | 3 +++
>  1 file changed, 3 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>