[PATCH] spi: dt-binding: clarify gpio chipselect language

[PATCH] spi: dt-binding: clarify gpio chipselect language

[Baruch Siach]

Commit 743179849015 (of_spi: add generic binding support to specify cs gpio)
introduced generic binding for gpio chip-select. The cs_gpio struct field,
however, is an internal implementation detail of the Linux SPI subsystem, and
should not be mentioned in the device tree binding documentation. Mention the
previously defined cs-gpios master node property instead.

Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Signed-off-by: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
---
 Documentation/devicetree/bindings/spi/spi-bus.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
index 800dafe..e5a4d1b 100644
--- a/Documentation/devicetree/bindings/spi/spi-bus.txt
+++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
@@ -67,7 +67,7 @@ only 1(SINGLE), 2(DUAL) and 4(QUAD).
 Dual/Quad mode is not allowed when 3-wire mode is used.
 
 If a gpio chipselect is used for the SPI slave the gpio number will be passed
-via the cs_gpio
+via the SPI master node cs-gpios property.
 
 SPI example for an MPC5200 SPI bus:
 	spi@f00 {
-- 
1.8.4.3

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Re: [PATCH] spi: dt-binding: clarify gpio chipselect language

[Jean-Christophe PLAGNIOL-VILLARD]

On 13:39 Thu 05 Dec     , Baruch Siach wrote:
> Commit 743179849015 (of_spi: add generic binding support to specify cs gpio)
> introduced generic binding for gpio chip-select. The cs_gpio struct field,
> however, is an internal implementation detail of the Linux SPI subsystem, and
> should not be mentioned in the device tree binding documentation. Mention the
> previously defined cs-gpios master node property instead.
> 
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
> Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
> Signed-off-by: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/spi/spi-bus.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
> index 800dafe..e5a4d1b 100644
> --- a/Documentation/devicetree/bindings/spi/spi-bus.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
> @@ -67,7 +67,7 @@ only 1(SINGLE), 2(DUAL) and 4(QUAD).
>  Dual/Quad mode is not allowed when 3-wire mode is used.
>  
>  If a gpio chipselect is used for the SPI slave the gpio number will be passed
> -via the cs_gpio
> +via the SPI master node cs-gpios property.

here it's an information about the c structure

Best Regards,
J.
>  
>  SPI example for an MPC5200 SPI bus:
>  	spi@f00 {
> -- 
> 1.8.4.3
> 
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Re: [PATCH] spi: dt-binding: clarify gpio chipselect language

[Baruch Siach]

Hi Jean-Christophe,

On Thu, Dec 05, 2013 at 05:44:00PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 13:39 Thu 05 Dec     , Baruch Siach wrote:
> > Commit 743179849015 (of_spi: add generic binding support to specify cs gpio)
> > introduced generic binding for gpio chip-select. The cs_gpio struct field,
> > however, is an internal implementation detail of the Linux SPI subsystem, and
> > should not be mentioned in the device tree binding documentation. Mention the
> > previously defined cs-gpios master node property instead.
> > 
> > Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
> > Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
> > Signed-off-by: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
> > ---
> >  Documentation/devicetree/bindings/spi/spi-bus.txt | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
> > index 800dafe..e5a4d1b 100644
> > --- a/Documentation/devicetree/bindings/spi/spi-bus.txt
> > +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
> > @@ -67,7 +67,7 @@ only 1(SINGLE), 2(DUAL) and 4(QUAD).
> >  Dual/Quad mode is not allowed when 3-wire mode is used.
> >  
> >  If a gpio chipselect is used for the SPI slave the gpio number will be passed
> > -via the cs_gpio
> > +via the SPI master node cs-gpios property.
> 
> here it's an information about the c structure

Is binding documentation the place for implementation notes? Especially since 
cs_gpio struct member is never mentioned in this document, and its name is 
confusingly similar to the cs-gpios property name.

baruch

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Re: [PATCH] spi: dt-binding: clarify gpio chipselect language

[Mark Rutland]

On Sun, Dec 08, 2013 at 05:37:12AM +0000, Baruch Siach wrote:
> Hi Jean-Christophe,
> 
> On Thu, Dec 05, 2013 at 05:44:00PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 13:39 Thu 05 Dec     , Baruch Siach wrote:
> > > Commit 743179849015 (of_spi: add generic binding support to specify cs gpio)
> > > introduced generic binding for gpio chip-select. The cs_gpio struct field,
> > > however, is an internal implementation detail of the Linux SPI subsystem, and
> > > should not be mentioned in the device tree binding documentation. Mention the
> > > previously defined cs-gpios master node property instead.
> > > 
> > > Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
> > > Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
> > > Signed-off-by: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
> > > ---
> > >  Documentation/devicetree/bindings/spi/spi-bus.txt | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
> > > index 800dafe..e5a4d1b 100644
> > > --- a/Documentation/devicetree/bindings/spi/spi-bus.txt
> > > +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
> > > @@ -67,7 +67,7 @@ only 1(SINGLE), 2(DUAL) and 4(QUAD).
> > >  Dual/Quad mode is not allowed when 3-wire mode is used.
> > >  
> > >  If a gpio chipselect is used for the SPI slave the gpio number will be passed
> > > -via the cs_gpio
> > > +via the SPI master node cs-gpios property.
> > 
> > here it's an information about the c structure
> 
> Is binding documentation the place for implementation notes? Especially since 
> cs_gpio struct member is never mentioned in this document, and its name is 
> confusingly similar to the cs-gpios property name.

Preferably, a binding document should not refer to any implementation
details of drivers or subsystems using the binding. The implementation
can change separately from the binding, and separating the two keeps us
honest.

Thanks,
Mark.
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Re: [PATCH] spi: dt-binding: clarify gpio chipselect language

[Mark Brown]

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On Thu, Dec 05, 2013 at 01:39:05PM +0200, Baruch Siach wrote:
> Commit 743179849015 (of_spi: add generic binding support to specify cs gpio)
> introduced generic binding for gpio chip-select. The cs_gpio struct field,
> however, is an internal implementation detail of the Linux SPI subsystem, and
> should not be mentioned in the device tree binding documentation. Mention the
> previously defined cs-gpios master node property instead.

Applied, thanks.

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