[RFC/PATCHv2,2/3] dt-binding: spi: spi-dw: Select 16b or 32b access for Designware SPI

From: Thor Thayer <tthayer@opensource.altera.com>

Altera's Arria10 architecture requires a 32bit write accesses for
APB peripherals. The current spi-dw driver uses 16bit accesses in
some locations. This patch updated the bindings with an optional
field in the devicetree to select 32bit accesses.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
---
 Documentation/devicetree/bindings/spi/spi-dw.txt |    1 +
 1 file changed, 1 insertion(+)

On Sat, Mar 7, 2015 at 1:46 AM,  <tthayer@opensource.altera.com> wrote:
> From: Thor Thayer <tthayer@opensource.altera.com>
>
> Altera's Arria10 architecture requires a 32bit write accesses for
> APB peripherals. The current spi-dw driver uses 16bit accesses in
> some locations. This patch updated the bindings with an optional
> field in the devicetree to select 32bit accesses.
>

One comment below.

> Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
> ---
>  Documentation/devicetree/bindings/spi/spi-dw.txt |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/spi/spi-dw.txt b/Documentation/devicetree/bindings/spi/spi-dw.txt
> index 7b63ed6..034dbdd 100644
> --- a/Documentation/devicetree/bindings/spi/spi-dw.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-dw.txt
> @@ -11,6 +11,7 @@ Required properties:
>
>  Optional properties:
>  - cs-gpios: see spi-bus.txt
> +- 32bit_access : use 32 bit register accesses
>

The most big issue for my opinion with DT is an absence of the
standard for naming properties.

So, why underscore? May be it's a time to append a generic description
of this field to Documentation/devicetree/…

On 03/07/2015 01:58 PM, Andy Shevchenko wrote:
> On Sat, Mar 7, 2015 at 1:46 AM,  <tthayer@opensource.altera.com> wrote:
>> From: Thor Thayer <tthayer@opensource.altera.com>
>>
>> Altera's Arria10 architecture requires a 32bit write accesses for
>> APB peripherals. The current spi-dw driver uses 16bit accesses in
>> some locations. This patch updated the bindings with an optional
>> field in the devicetree to select 32bit accesses.
>>
>
> One comment below.
>
>> Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
>> ---
>>   Documentation/devicetree/bindings/spi/spi-dw.txt |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/spi/spi-dw.txt b/Documentation/devicetree/bindings/spi/spi-dw.txt
>> index 7b63ed6..034dbdd 100644
>> --- a/Documentation/devicetree/bindings/spi/spi-dw.txt
>> +++ b/Documentation/devicetree/bindings/spi/spi-dw.txt
>> @@ -11,6 +11,7 @@ Required properties:
>>
>>   Optional properties:
>>   - cs-gpios: see spi-bus.txt
>> +- 32bit_access : use 32 bit register accesses
>>
>
> The most big issue for my opinion with DT is an absence of the
> standard for naming properties.
>
> So, why underscore? May be it's a time to append a generic description
> of this field to Documentation/devicetree/…
>

Hi Andy,

I'm use the underscore to make it easier to read but I'm open to 
suggestions.

I stay away from dashes because these variable names are problematic to 
parse in languages like Python which may be used as an external tool.

I don't mind making it just 32bit if that is preferable or implementing 
a better field name.

Thanks for reviewing

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On Mon, Mar 09, 2015 at 01:11:28PM -0500, Thor Thayer wrote:

> I stay away from dashes because these variable names are problematic to
> parse in languages like Python which may be used as an external tool.

Dashes are idiomatic for device tree.

On 03/09/2015 01:19 PM, Mark Brown wrote:
> On Mon, Mar 09, 2015 at 01:11:28PM -0500, Thor Thayer wrote:
>
>> I stay away from dashes because these variable names are problematic to
>> parse in languages like Python which may be used as an external tool.
>
> Dashes are idiomatic for device tree.
>

Thanks, I will change to using a dash then.
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