linux-kernel - Re: [PATCH v4 02/11] dt-bindings: i2c: Discard i2c-slave flag from the DW I2C example

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Message-ID: <20200527171204.GA2348490@bogus>
Date:   Wed, 27 May 2020 11:12:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-mips@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 02/11] dt-bindings: i2c: Discard i2c-slave flag from
 the DW I2C example

On Wed, May 27, 2020 at 03:01:02PM +0300, Serge Semin wrote:
> dtc currently doesn't support I2C_OWN_SLAVE_ADDRESS flag set in the
> i2c "reg" property. If it is the compiler will print a warning:
> 
> Warning (i2c_bus_reg): /example-2/i2c@...0000/eeprom@64: I2C bus unit address format error, expected "40000064"
> Warning (i2c_bus_reg): /example-2/i2c@...0000/eeprom@64:reg: I2C address must be less than 10-bits, got "0x40000064"
> 
> In order to silence dtc up let's discard the flag from the DW I2C DT
> binding example for now. Just revert this commit when dtc is fixed.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Cc: linux-mips@...r.kernel.org
> 
> ---
> 
> Changelog v3:
> - This is a new patch created as a result of the Rob request to remove
>   the EEPROM-slave bit setting in the DT binndings example until the dtc
>   is fixed.
> ---
>  Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> index 4bd430b2b41d..101d78e8f19d 100644
> --- a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> @@ -137,7 +137,7 @@ examples:
>  
>        eeprom@64 {
>          compatible = "linux,slave-24c02";
> -        reg = <0x40000064>;
> +        reg = <0x64>;

But the compatible is a slave, so you need an example with a different 
device.

>        };
>      };
>    - |
> -- 
> 2.26.2
>