linux-kernel - Re: [PATCH v4 3/5] i2c: designware: Add slave definitions

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Date:   Mon, 12 Dec 2016 11:02:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Luis Oliveira <Luis.Oliveira@...opsys.com>
Cc:     wsa@...-dreams.de, mark.rutland@....com,
        jarkko.nikula@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        mika.westerberg@...ux.intel.com, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ramiro.Oliveira@...opsys.com, Joao.Pinto@...opsys.com,
        CARLOS.PALMINHA@...opsys.com
Subject: Re: [PATCH v4 3/5] i2c: designware: Add slave definitions

On Wed, Dec 07, 2016 at 05:55:50PM +0000, Luis Oliveira wrote:
> - Add slave definitions to i2c-designware-core
> - Changes in Kconfig to auto-enable I2C_SLAVE when compiling the modules
> - Add mode property to designware-core.txt that enable the "slave" selection:
>   - "mode" is an optional property that could be "slave" or "master"
>   - if "mode" is not set the block is considered master by default
> 
> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
> ---
> Changes V3->V4: (Andy Shevchenko)
> - created a common property for modes 
> - placed the generic dependency first
> 
>  .../devicetree/bindings/i2c/i2c-designware.txt     |  4 ++++
>  drivers/i2c/busses/Kconfig                         |  1 +
>  drivers/i2c/busses/i2c-designware-common.c         |  6 +++++
>  drivers/i2c/busses/i2c-designware-core.h           | 26 ++++++++++++++++++++++
>  4 files changed, 37 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> index fee26dc3e858..8ed2b532cd54 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> @@ -20,6 +20,9 @@ Optional properties :
>   - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds.
>     This value which is by default 300ns is used to compute the tHIGH period.
>  
> + - mode : should be either:
> +           - "master" to setup the hardware block as a I2C master
> +           - "slave" to setup the hardware block as a I2C slave

This should be documented in a common location. Can't it be a boolean to 
enable slave mode? Or don't you need to set the slave address? That 
could be enough to enable slave mode and there's already one example 
doing that.

Rob