linux-kernel - Re: [PATCH 1/2] dt-bindings: i2c: replace property i2c-mux-idle-disconnect

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Date:   Mon, 14 Oct 2019 15:44:54 +0000
From:   Peter Rosin <peda@...ntia.se>
To:     Biwen Li <biwen.li@....com>,
        "leoyang.li@....com" <leoyang.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>
CC:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: i2c: replace property
 i2c-mux-idle-disconnect

On 2019-10-14 13:25, Biwen Li wrote:
> This replaces property i2c-mux-idle-disconnect with idle-state
> 
> Signed-off-by: Biwen Li <biwen.li@....com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
> index 30ac6a60f041..f2db517b1635 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
> @@ -25,9 +25,7 @@ Required Properties:
>  Optional Properties:
>  
>    - reset-gpios: Reference to the GPIO connected to the reset input.
> -  - i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
> -    children in idle state. This is necessary for example, if there are several
> -    multiplexers on the bus and the devices behind them use same I2C addresses.
> +  - idle-state: Please refer to Documentation/devicetree/bindings/mux/mux-controller.txt
>    - interrupts: Interrupt mapping for IRQ.
>    - interrupt-controller: Marks the device node as an interrupt controller.
>    - #interrupt-cells : Should be two.
> 

You can't just remove i2c-mux-idle-disconnect. It needs to remain, and the
driver needs to maintain support for this in case a new kernel is running
with an old devicetree.

Cheers,
Peter