[PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Dirk Behme]

From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

There are SPI devices which need a SPI clock with active low polarity and
high inactive state.

Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:

DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high

Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
---

Question: Are there real world examples for a need of an individual setting of
clock polarity/inactive state?

 drivers/spi/spi-imx.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index e834ff8..d64655b 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
 #define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))
 #define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))
 #define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))
+#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))
 
 #define MX51_ECSPI_INT		0x10
 #define MX51_ECSPI_INT_TEEN		(1 <<  0)
@@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
 	if (config->mode & SPI_CPHA)
 		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
 
-	if (config->mode & SPI_CPOL)
+	if (config->mode & SPI_CPOL) {
 		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
-
+		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
+	}
 	if (config->mode & SPI_CS_HIGH)
 		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
 
-- 
1.7.0.4


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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Shawn Guo]

Copy Uwe ...

On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
> From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> 
> There are SPI devices which need a SPI clock with active low polarity and
> high inactive state.
> 
> Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
> according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
> 
> DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
> DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
> 
> Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> ---
> 
> Question: Are there real world examples for a need of an individual setting of
> clock polarity/inactive state?

I'm less concerned about that.  We can always patch the driver when
the real world example occurs?

Regards,
Shawn

> 
>  drivers/spi/spi-imx.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> index e834ff8..d64655b 100644
> --- a/drivers/spi/spi-imx.c
> +++ b/drivers/spi/spi-imx.c
> @@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
>  #define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))
>  #define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))
>  #define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))
> +#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))
>  
>  #define MX51_ECSPI_INT		0x10
>  #define MX51_ECSPI_INT_TEEN		(1 <<  0)
> @@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
>  	if (config->mode & SPI_CPHA)
>  		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
>  
> -	if (config->mode & SPI_CPOL)
> +	if (config->mode & SPI_CPOL) {
>  		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
> -
> +		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
> +	}
>  	if (config->mode & SPI_CS_HIGH)
>  		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
>  
> -- 
> 1.7.0.4
> 


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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Dirk Behme]

On 31.08.2012 04:35, Shawn Guo wrote:
> Copy Uwe ...

Ping ;)

Any opinions on this?

Thanks

Dirk

> On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
>> From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>>
>> There are SPI devices which need a SPI clock with active low polarity and
>> high inactive state.
>>
>> Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
>> according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
>>
>> DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
>> DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
>>
>> Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>> ---
>>
>> Question: Are there real world examples for a need of an individual setting of
>> clock polarity/inactive state?
> 
> I'm less concerned about that.  We can always patch the driver when
> the real world example occurs?
> 
> Regards,
> Shawn
> 
>>  drivers/spi/spi-imx.c |    6 ++++--
>>  1 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
>> index e834ff8..d64655b 100644
>> --- a/drivers/spi/spi-imx.c
>> +++ b/drivers/spi/spi-imx.c
>> @@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
>>  #define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))
>>  #define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))
>>  #define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))
>> +#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))
>>  
>>  #define MX51_ECSPI_INT		0x10
>>  #define MX51_ECSPI_INT_TEEN		(1 <<  0)
>> @@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
>>  	if (config->mode & SPI_CPHA)
>>  		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
>>  
>> -	if (config->mode & SPI_CPOL)
>> +	if (config->mode & SPI_CPOL) {
>>  		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
>> -
>> +		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
>> +	}
>>  	if (config->mode & SPI_CS_HIGH)
>>  		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
>>  
>> -- 
>> 1.7.0.4

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Uwe Kleine-König]

On Fri, Sep 21, 2012 at 09:36:51AM +0200, Dirk Behme wrote:
> On 31.08.2012 04:35, Shawn Guo wrote:
> >Copy Uwe ...
Copy our kernel mailing list ...

> Ping ;)
> 
> Any opinions on this?
Assuming it fixes access to a device I'm ok with your patch, but I don't
really feel responsible for the driver (i.e. me not acking shouldn't
have a negative influence on getting the patch in).

> >On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
> >>From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> >>
> >>There are SPI devices which need a SPI clock with active low polarity and
> >>high inactive state.
> >>
> >>Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
> >>according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
> >>
> >>DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
> >>DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
> >>
> >>Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
If you forward a patch you must add your S-o-b.

> >>---
> >>
> >>Question: Are there real world examples for a need of an individual setting of
> >>clock polarity/inactive state?
> >
> >I'm less concerned about that.  We can always patch the driver when
> >the real world example occurs?
yes.

Thanks
Uwe

> >> drivers/spi/spi-imx.c |    6 ++++--
> >> 1 files changed, 4 insertions(+), 2 deletions(-)
> >>
> >>diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> >>index e834ff8..d64655b 100644
> >>--- a/drivers/spi/spi-imx.c
> >>+++ b/drivers/spi/spi-imx.c
> >>@@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
> >> #define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))
> >> #define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))
> >> #define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))
> >>+#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))
> >> #define MX51_ECSPI_INT		0x10
> >> #define MX51_ECSPI_INT_TEEN		(1 <<  0)
> >>@@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
> >> 	if (config->mode & SPI_CPHA)
> >> 		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
> >>-	if (config->mode & SPI_CPOL)
> >>+	if (config->mode & SPI_CPOL) {
> >> 		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
> >>-
> >>+		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
> >>+	}
> >> 	if (config->mode & SPI_CS_HIGH)
> >> 		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
> >>-- 
> >>1.7.0.4
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Dirk Behme]

On 21.09.2012 09:54, Uwe Kleine-König wrote:
> On Fri, Sep 21, 2012 at 09:36:51AM +0200, Dirk Behme wrote:
>> On 31.08.2012 04:35, Shawn Guo wrote:
>>> Copy Uwe ...
> Copy our kernel mailing list ...
>
>> Ping ;)
>>
>> Any opinions on this?
> Assuming it fixes access to a device I'm ok with your patch, but I don't
> really feel responsible for the driver (i.e. me not acking shouldn't
> have a negative influence on getting the patch in).

Ok, thanks.

I'm not so familiar with the SPI world: Who would be the best person 
to ack this, and in case it's ok finally apply it, then?

Thanks

Dirk

>>> On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
>>>> From: Knut Wohlrab<knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>>>>
>>>> There are SPI devices which need a SPI clock with active low polarity and
>>>> high inactive state.
>>>>
>>>> Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
>>>> according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
>>>>
>>>> DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
>>>> DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
>>>>
>>>> Signed-off-by: Knut Wohlrab<knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> If you forward a patch you must add your S-o-b.
>
>>>> ---
>>>>
>>>> Question: Are there real world examples for a need of an individual setting of
>>>> clock polarity/inactive state?
>>>
>>> I'm less concerned about that.  We can always patch the driver when
>>> the real world example occurs?
> yes.
>
> Thanks
> Uwe
>
>>>> drivers/spi/spi-imx.c |    6 ++++--
>>>> 1 files changed, 4 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
>>>> index e834ff8..d64655b 100644
>>>> --- a/drivers/spi/spi-imx.c
>>>> +++ b/drivers/spi/spi-imx.c
>>>> @@ -197,6 +197,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
>>>> #define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1<<  ((cs) +  4))
>>>> #define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1<<  ((cs) +  8))
>>>> #define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1<<  ((cs) + 12))
>>>> +#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1<<  ((cs) + 20))
>>>> #define MX51_ECSPI_INT		0x10
>>>> #define MX51_ECSPI_INT_TEEN		(1<<   0)
>>>> @@ -287,9 +288,10 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
>>>> 	if (config->mode&  SPI_CPHA)
>>>> 		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
>>>> -	if (config->mode&  SPI_CPOL)
>>>> +	if (config->mode&  SPI_CPOL) {
>>>> 		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
>>>> -
>>>> +		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
>>>> +	}
>>>> 	if (config->mode&  SPI_CS_HIGH)
>>>> 		cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
>>>> --
>>>> 1.7.0.4
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>


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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Fabio Estevam]

Hi Dirk,

On Sat, Sep 22, 2012 at 3:10 AM, Dirk Behme <dirk.behme-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> I'm not so familiar with the SPI world: Who would be the best person to ack
> this, and in case it's ok finally apply it, then?

Mark Brown has been taking care of spi patches recently.

Regards,

Fabio Estevam

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Shawn Guo]

On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
> From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> 
> There are SPI devices which need a SPI clock with active low polarity and
> high inactive state.
> 
> Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
> according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
> 
> DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
> DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
> 
> Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

Acked-by: Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Dirk Behme]

Hi Mark,

On 24.09.2012 07:06, Shawn Guo wrote:
> On Fri, Aug 31, 2012 at 10:55:11AM +0200, Dirk Behme wrote:
>> From: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>>
>> There are SPI devices which need a SPI clock with active low polarity and
>> high inactive state.
>>
>> Add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL
>> according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:
>>
>> DT without "spi-cpol" = 0 = clock active high polarity = inactive state low
>> DT with    "spi-cpol" = 1 = clock active low  polarity = inactive state high
>>
>> Signed-off-by: Knut Wohlrab <knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

Signed-off-by: Dirk Behme <dirk.behme-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

> Acked-by: Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

Being not so familiar with the flow of SPI patches, I was told that you 
are taking care of spi patches recently?

Do you like to have a look to this patch?

Many thanks and best regards

Dirk

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Mark Brown]

On Mon, Sep 24, 2012 at 08:34:27AM +0200, Dirk Behme wrote:

> Being not so familiar with the flow of SPI patches, I was told that you  
> are taking care of spi patches recently?

> Do you like to have a look to this patch?

Well, nobody appears to have sent me a copy of it...

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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Dirk Behme]

On 24.09.2012 12:02, Mark Brown wrote:
> On Mon, Sep 24, 2012 at 08:34:27AM +0200, Dirk Behme wrote:
> 
>> Being not so familiar with the flow of SPI patches, I was told that you  
>> are taking care of spi patches recently?
> 
>> Do you like to have a look to this patch?
> 
> Well, nobody appears to have sent me a copy of it...

We are talking about

http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/116783.html

which should be at spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org and 
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org .

I just learned that you might take care of spi patches recently, so 
sorry for not adding you to the CC, initially.

Let me know if you can find above thread on one of the both mailing 
lists. If not, I would be happy to resend it again.

Many thanks for your help!

Dirk



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Re: [PATCH] spi/imx: set the inactive state of the clock according to the clock polarity

[Mark Brown]

On Mon, Sep 24, 2012 at 01:31:22PM +0200, Dirk Behme wrote:

> Let me know if you can find above thread on one of the both mailing
> lists. If not, I would be happy to resend it again.

Yes, of course - it's hard to apply patches from web archives.

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