linux-kernel - Re: [PATCH v2 2/5] Documentation: devicetree: Add DT bindings to eeprom

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Date:	Thu, 19 Nov 2015 12:30:50 -0500
From:	Cory Tusar <cory.tusar@...1solutions.com>
To:	Rob Herring <robh@...nel.org>
Cc:	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, agust@...x.de,
	gregkh@...uxfoundation.org, jic23@...nel.org, vz@...ia.com,
	broonie@...nel.org, afd@...com, andrew@...n.ch,
	Chris.Healy@....aero, Keith.Vennel@....aero,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] Documentation: devicetree: Add DT bindings to
 eeprom_93xx46 driver.

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On 11/19/2015 09:59 AM, Rob Herring wrote:
> On Wed, Nov 18, 2015 at 10:29:38PM -0500, Cory Tusar wrote:
>> This commit documents bindings to be added to the eeprom_93xx46 driver
>> which will allow:
>>
>>   - Device word size and read-only attributes to be specified.
>>   - A device-specific compatible string for use with Atmel AT93C46D
>>     EEPROMs.
>>   - Specifying a GPIO line to function as a 'select' or 'enable' signal
>>     prior to accessing the EEPROM.
>>
>> Signed-off-by: Cory Tusar <cory.tusar@...1solutions.com>
> 
> One nit, but:
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 
>> ---
>>  .../devicetree/bindings/misc/eeprom-93xx46.txt     | 25 ++++++++++++++++++++++
>>  1 file changed, 25 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
>> new file mode 100644
>> index 0000000..8e116a1
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
>> @@ -0,0 +1,25 @@
>> +EEPROMs (SPI) compatible with Microchip Technology 93xx46 family.
>> +
>> +Required properties:
>> +- compatible : shall be one of:
>> +    "atmel,at93c46d"
>> +    "eeprom-93xx46"
>> +- data-size : number of data bits per word (either 8 or 16)
>> +
>> +Optional properties:
>> +- read-only : parameter-less property which disables writes to the EEPROM
>> +- select-gpios : if present, specifies the GPIO that will be asserted prior to
>> +  each access to the EEPROM (e.g. for SPI bus multiplexing)
>> +
>> +Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
>> +apply.  In particular, "reg" and "spi-max-frequency" properties must be given.
>> +
>> +Example:
>> +	93c46c@0 {
> 
> This should be eeprom@0.

Easy enough.  Will fix for v3.  Thanks.

>> +		compatible = "eeprom-93xx46";
>> +		reg = <0>;
>> +		spi-max-frequency = <1000000>;
>> +		spi-cs-high;
>> +		data-size = <8>;
>> +		select-gpios = <&gpio4 4 GPIO_ACTIVE_HIGH>;
>> +	};
>> -- 
>> 2.4.10
>>


- -- 
Cory Tusar
Principal
PID 1 Solutions, Inc.


"There are two ways of constructing a software design.  One way is to
 make it so simple that there are obviously no deficiencies, and the
 other way is to make it so complicated that there are no obvious
 deficiencies."  --Sir Charles Anthony Richard Hoare

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