IMX27: How to do 22k pull-up with the pinctrl ?

IMX27: How to do 22k pull-up with the pinctrl ?

[Chris Ruehl]

Hi,

while I port the static code to the DT I step into the problem to
set the PSCR for the sdhc2 ports to 22k pull-up
I look for something like described in
     pinctrl/fsl,imx-pinctrl.txt

the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.


pinctrl_sdhc2_1: sdhc2-1 {
                         fsl,pins = <
                                 MX27_PAD_SD2_D0__SD2_D0  0x1
                                 MX27_PAD_SD2_D1__SD2_D1  0x1
                                 MX27_PAD_SD2_D2__SD2_D2  0x1
                                 MX27_PAD_SD2_D3__SD2_D3  0x1
                                 MX27_PAD_SD2_CLK__SD2_CLK  0x1
                                 MX27_PAD_SD2_CMD__SD2_CMD  0x1
                         >;
                 };

its setup in board specific c-file

/* 22k pull-up for sd2 pins  */
         reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
         reg &= ~0xfff0;
         reg |= 0xfff0;
         __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));


Any successions?

Regards
Chris
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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Mark Rutland]

On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
> Hi,

Hi,

While this does involve device tree, it's not strictly a device tree
problem, and the people best placed to answer your question don't seem
to be on Cc. You'd get better responses if you used get_maintainer.pl,
or looked at the commit history of the driver or binding to find people
likely to be able to help.

I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
signed-off-bys on the binding document.

Mark.

> 
> while I port the static code to the DT I step into the problem to
> set the PSCR for the sdhc2 ports to 22k pull-up
> I look for something like described in
>      pinctrl/fsl,imx-pinctrl.txt
> 
> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
> 
> 
> pinctrl_sdhc2_1: sdhc2-1 {
>                          fsl,pins = <
>                                  MX27_PAD_SD2_D0__SD2_D0  0x1
>                                  MX27_PAD_SD2_D1__SD2_D1  0x1
>                                  MX27_PAD_SD2_D2__SD2_D2  0x1
>                                  MX27_PAD_SD2_D3__SD2_D3  0x1
>                                  MX27_PAD_SD2_CLK__SD2_CLK  0x1
>                                  MX27_PAD_SD2_CMD__SD2_CMD  0x1
>                          >;
>                  };
> 
> its setup in board specific c-file
> 
> /* 22k pull-up for sd2 pins  */
>          reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>          reg &= ~0xfff0;
>          reg |= 0xfff0;
>          __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
> 
> 
> Any successions?
> 
> Regards
> Chris
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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Shawn Guo]

Copy Markus who is working on imx27 pinctrl driver.

On Mon, Nov 11, 2013 at 12:03:57PM +0000, Mark Rutland wrote:
> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
> > Hi,
> 
> Hi,
> 
> While this does involve device tree, it's not strictly a device tree
> problem, and the people best placed to answer your question don't seem
> to be on Cc. You'd get better responses if you used get_maintainer.pl,
> or looked at the commit history of the driver or binding to find people
> likely to be able to help.
> 
> I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
> signed-off-bys on the binding document.

Thanks, Mark.

<snip>

> > while I port the static code to the DT I step into the problem to
> > set the PSCR for the sdhc2 ports to 22k pull-up

Is the code from mainline kernel or private tree?  I'm asking because I
do not see non-DT imx27 iomux-v1 driver has interface for setting up
DSCR or PSCR in SYSCTRL block.  That's probably why Markus did not
support that in the imx27 pinctrl driver, I guess.

Shawn

> > I look for something like described in
> >      pinctrl/fsl,imx-pinctrl.txt
> > 
> > the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
> > 
> > 
> > pinctrl_sdhc2_1: sdhc2-1 {
> >                          fsl,pins = <
> >                                  MX27_PAD_SD2_D0__SD2_D0  0x1
> >                                  MX27_PAD_SD2_D1__SD2_D1  0x1
> >                                  MX27_PAD_SD2_D2__SD2_D2  0x1
> >                                  MX27_PAD_SD2_D3__SD2_D3  0x1
> >                                  MX27_PAD_SD2_CLK__SD2_CLK  0x1
> >                                  MX27_PAD_SD2_CMD__SD2_CMD  0x1
> >                          >;
> >                  };
> > 
> > its setup in board specific c-file
> > 
> > /* 22k pull-up for sd2 pins  */
> >          reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
> >          reg &= ~0xfff0;
> >          reg |= 0xfff0;
> >          __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
> > 
> > 
> > Any successions?
> > 
> > Regards
> > Chris
> > --
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> > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 

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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Markus Pargmann]

On Mon, Nov 11, 2013 at 10:26:41PM +0800, Shawn Guo wrote:
> Copy Markus who is working on imx27 pinctrl driver.
> 
> On Mon, Nov 11, 2013 at 12:03:57PM +0000, Mark Rutland wrote:
> > On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
> > > Hi,
> > 
> > Hi,
> > 
> > While this does involve device tree, it's not strictly a device tree
> > problem, and the people best placed to answer your question don't seem
> > to be on Cc. You'd get better responses if you used get_maintainer.pl,
> > or looked at the commit history of the driver or binding to find people
> > likely to be able to help.
> > 
> > I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
> > signed-off-bys on the binding document.
> 
> Thanks, Mark.
> 
> <snip>
> 
> > > while I port the static code to the DT I step into the problem to
> > > set the PSCR for the sdhc2 ports to 22k pull-up
> 
> Is the code from mainline kernel or private tree?  I'm asking because I
> do not see non-DT imx27 iomux-v1 driver has interface for setting up
> DSCR or PSCR in SYSCTRL block.  That's probably why Markus did not
> support that in the imx27 pinctrl driver, I guess.

DSCR controls groups of pins, for example DS_SLOW10 (DSCR1) controls all
pins of SDHC1 and CSPI3. I don't think a config option for a pin should
influence the behaviour of other pins.
PSCR could be managed by the imx27 pinctrl driver but it is not included
in the GPIO/pinmux module. It is included in "System control module"
which does not exist on imx21 for example.

Regards,

Markus Pargmann

> 
> Shawn
> 
> > > I look for something like described in
> > >      pinctrl/fsl,imx-pinctrl.txt
> > > 
> > > the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
> > > 
> > > 
> > > pinctrl_sdhc2_1: sdhc2-1 {
> > >                          fsl,pins = <
> > >                                  MX27_PAD_SD2_D0__SD2_D0  0x1
> > >                                  MX27_PAD_SD2_D1__SD2_D1  0x1
> > >                                  MX27_PAD_SD2_D2__SD2_D2  0x1
> > >                                  MX27_PAD_SD2_D3__SD2_D3  0x1
> > >                                  MX27_PAD_SD2_CLK__SD2_CLK  0x1
> > >                                  MX27_PAD_SD2_CMD__SD2_CMD  0x1
> > >                          >;
> > >                  };
> > > 
> > > its setup in board specific c-file
> > > 
> > > /* 22k pull-up for sd2 pins  */
> > >          reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
> > >          reg &= ~0xfff0;
> > >          reg |= 0xfff0;
> > >          __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
> > > 
> > > 
> > > Any successions?
> > > 
> > > Regards
> > > Chris
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe devicetree" in
> > > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > 
> 
> 

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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Chris Ruehl]

On Tuesday, November 12, 2013 12:21 AM, Markus Pargmann wrote:
> On Mon, Nov 11, 2013 at 10:26:41PM +0800, Shawn Guo wrote:
>> Copy Markus who is working on imx27 pinctrl driver.
>>
>> On Mon, Nov 11, 2013 at 12:03:57PM +0000, Mark Rutland wrote:
>>> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
>>>> Hi,
>>>
>>> Hi,
>>>
>>> While this does involve device tree, it's not strictly a device tree
>>> problem, and the people best placed to answer your question don't seem
>>> to be on Cc. You'd get better responses if you used get_maintainer.pl,
>>> or looked at the commit history of the driver or binding to find people
>>> likely to be able to help.
>>>
>>> I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
>>> signed-off-bys on the binding document.
>>
>> Thanks, Mark.
>>
>> <snip>
>>
>>>> while I port the static code to the DT I step into the problem to
>>>> set the PSCR for the sdhc2 ports to 22k pull-up
>>
>> Is the code from mainline kernel or private tree?  I'm asking because I
>> do not see non-DT imx27 iomux-v1 driver has interface for setting up
>> DSCR or PSCR in SYSCTRL block.  That's probably why Markus did not
>> support that in the imx27 pinctrl driver, I guess.
>
> DSCR controls groups of pins, for example DS_SLOW10 (DSCR1) controls all
> pins of SDHC1 and CSPI3. I don't think a config option for a pin should
> influence the behaviour of other pins.
> PSCR could be managed by the imx27 pinctrl driver but it is not included
> in the GPIO/pinmux module. It is included in "System control module"
> which does not exist on imx21 for example.
>
> Regards,
>
> Markus Pargmann

Hi Markus,

do you think its difficult to add the mentioned PSCR manipulations to a
new to add System control module?

Regards
Chris

>
>>
>> Shawn
>>
>>>> I look for something like described in
>>>>       pinctrl/fsl,imx-pinctrl.txt
>>>>
>>>> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
>>>>
>>>>
>>>> pinctrl_sdhc2_1: sdhc2-1 {
>>>>                           fsl,pins =<
>>>>                                   MX27_PAD_SD2_D0__SD2_D0  0x1
>>>>                                   MX27_PAD_SD2_D1__SD2_D1  0x1
>>>>                                   MX27_PAD_SD2_D2__SD2_D2  0x1
>>>>                                   MX27_PAD_SD2_D3__SD2_D3  0x1
>>>>                                   MX27_PAD_SD2_CLK__SD2_CLK  0x1
>>>>                                   MX27_PAD_SD2_CMD__SD2_CMD  0x1
>>>>                           >;
>>>>                   };
>>>>
>>>> its setup in board specific c-file
>>>>
>>>> /* 22k pull-up for sd2 pins  */
>>>>           reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>>>           reg&= ~0xfff0;
>>>>           reg |= 0xfff0;
>>>>           __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>>>
>>>>
>>>> Any successions?
>>>>
>>>> Regards
>>>> Chris

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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Chris Ruehl]

On Monday, November 11, 2013 10:26 PM, Shawn Guo wrote:
> Copy Markus who is working on imx27 pinctrl driver.
>
> On Mon, Nov 11, 2013 at 12:03:57PM +0000, Mark Rutland wrote:
>> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
>>> Hi,
>>
>> Hi,
>>
>> While this does involve device tree, it's not strictly a device tree
>> problem, and the people best placed to answer your question don't seem
>> to be on Cc. You'd get better responses if you used get_maintainer.pl,
>> or looked at the commit history of the driver or binding to find people
>> likely to be able to help.
>>
>> I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
>> signed-off-bys on the binding document.
>
> Thanks, Mark.
>
> <snip>
>
>>> while I port the static code to the DT I step into the problem to
>>> set the PSCR for the sdhc2 ports to 22k pull-up
>
> Is the code from mainline kernel or private tree?  I'm asking because I
> do not see non-DT imx27 iomux-v1 driver has interface for setting up
> DSCR or PSCR in SYSCTRL block.  That's probably why Markus did not
> support that in the imx27 pinctrl driver, I guess.
>
> Shawn

Hi Shawn,

I work on a private tree using the 3.12-next source as my base. Mainboard is a 
new design using for RFID integrated readers. I include almost all available
features from the imx27.
OTG, USB2, SPI, I2C, MMC, DM9000 ..

To set the pull-strength would be a great thing.

Chris

>
>>> I look for something like described in
>>>       pinctrl/fsl,imx-pinctrl.txt
>>>
>>> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
>>>
>>>
>>> pinctrl_sdhc2_1: sdhc2-1 {
>>>                           fsl,pins =<
>>>                                   MX27_PAD_SD2_D0__SD2_D0  0x1
>>>                                   MX27_PAD_SD2_D1__SD2_D1  0x1
>>>                                   MX27_PAD_SD2_D2__SD2_D2  0x1
>>>                                   MX27_PAD_SD2_D3__SD2_D3  0x1
>>>                                   MX27_PAD_SD2_CLK__SD2_CLK  0x1
>>>                                   MX27_PAD_SD2_CMD__SD2_CMD  0x1
>>>                           >;
>>>                   };
>>>
>>> its setup in board specific c-file
>>>
>>> /* 22k pull-up for sd2 pins  */
>>>           reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>>           reg&= ~0xfff0;
>>>           reg |= 0xfff0;
>>>           __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>>
>>>
>>> Any successions?
>>>
>>> Regards
>>> Chris
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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>>>
>

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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Linus Walleij]

On Mon, Nov 11, 2013 at 1:03 PM, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org> wrote:
> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:

>> while I port the static code to the DT I step into the problem to
>> set the PSCR for the sdhc2 ports to 22k pull-up
>> I look for something like described in
>>      pinctrl/fsl,imx-pinctrl.txt
>>
>> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.

So in the generic pin configuration, which we nowadays recommend new
platforms to use, there is this (include/linux/pinctrl/pinconf-generic):

 * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
 *      impedance to VDD). If the argument is != 0 pull-up is enabled,
 *      if it is 0, pull-up is total, i.e. the pin is connected to VDD.
 * @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
 *      impedance to GROUND). If the argument is != 0 pull-down is enabled,
 *      if it is 0, pull-down is total, i.e. the pin is connected to GROUND.

The idea was to extend that with an argument for the number of
Ohms the day it was needed and supported by some platform.

We would then use the bindings from
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
by adding something like this:

(...)
bias-pull-up-ohms = <22000>;
(...)

So in the generic world it can be accomodated in a quite
straight-forward way.

When the i.MX pin control was added in v3.5 the generic
pin config was available but it was opted to use another
pattern. One way to solve this is to migrate i.MX to use the
generic pin config, which is going to be hard work. But as
a subsystem maintainer that is still what I would recommend.

Yours,
Linus Walleij
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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Chris Ruehl]

On Monday, November 11, 2013 10:29 PM, Linus Walleij wrote:
> On Mon, Nov 11, 2013 at 1:03 PM, Mark Rutland<mark.rutland-5wv7dgnIgG8@public.gmane.org>  wrote:
>> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
>
>>> while I port the static code to the DT I step into the problem to
>>> set the PSCR for the sdhc2 ports to 22k pull-up
>>> I look for something like described in
>>>       pinctrl/fsl,imx-pinctrl.txt
>>>
>>> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
>
> So in the generic pin configuration, which we nowadays recommend new
> platforms to use, there is this (include/linux/pinctrl/pinconf-generic):
>
>   * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
>   *      impedance to VDD). If the argument is != 0 pull-up is enabled,
>   *      if it is 0, pull-up is total, i.e. the pin is connected to VDD.
>   * @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
>   *      impedance to GROUND). If the argument is != 0 pull-down is enabled,
>   *      if it is 0, pull-down is total, i.e. the pin is connected to GROUND.
>
> The idea was to extend that with an argument for the number of
> Ohms the day it was needed and supported by some platform.
>
> We would then use the bindings from
> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> by adding something like this:
>
> (...)
> bias-pull-up-ohms =<22000>;
> (...)
>
> So in the generic world it can be accomodated in a quite
> straight-forward way.
>
> When the i.MX pin control was added in v3.5 the generic
> pin config was available but it was opted to use another
> pattern. One way to solve this is to migrate i.MX to use the
> generic pin config, which is going to be hard work. But as
> a subsystem maintainer that is still what I would recommend.
>
> Yours,
> Linus Walleij

Hi Linus,
Thank you for that very interesting comment!

I agree with your idea to move the IMX code to that more generic solution, there 
are already different ways to setup the DT for imx27 vs. imx3x or imx6 etc. and 
its not going to be better, my guess!

Chris

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Re: IMX27: How to do 22k pull-up with the pinctrl ?

[Chris Ruehl]

On Monday, November 11, 2013 08:03 PM, Mark Rutland wrote:
> On Mon, Nov 11, 2013 at 10:45:30AM +0000, Chris Ruehl wrote:
>> Hi,
>
> Hi,
>
> While this does involve device tree, it's not strictly a device tree
> problem, and the people best placed to answer your question don't seem
> to be on Cc. You'd get better responses if you used get_maintainer.pl,
> or looked at the commit history of the driver or binding to find people
> likely to be able to help.
>
> I've added Dong Aisheng, Shawn Guo, and Linus Walleij to Cc, as they had
> signed-off-bys on the binding document.
>
> Mark.

Dear Mark
Thanks.
I'm late with my answer, my data-center support change switches and forget to 
told the users about this.. I had no email for a while. Welcome to Hong Kong!


>
>>
>> while I port the static code to the DT I step into the problem to
>> set the PSCR for the sdhc2 ports to 22k pull-up
>> I look for something like described in
>>       pinctrl/fsl,imx-pinctrl.txt
>>
>> the fsl,imx27-pinctrl only say 0/1 dis/enable pull up but not the strength.
>>
>>
>> pinctrl_sdhc2_1: sdhc2-1 {
>>                           fsl,pins =<
>>                                   MX27_PAD_SD2_D0__SD2_D0  0x1
>>                                   MX27_PAD_SD2_D1__SD2_D1  0x1
>>                                   MX27_PAD_SD2_D2__SD2_D2  0x1
>>                                   MX27_PAD_SD2_D3__SD2_D3  0x1
>>                                   MX27_PAD_SD2_CLK__SD2_CLK  0x1
>>                                   MX27_PAD_SD2_CMD__SD2_CMD  0x1
>>                           >;
>>                   };
>>
>> its setup in board specific c-file
>>
>> /* 22k pull-up for sd2 pins  */
>>           reg = __raw_readw(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>           reg&= ~0xfff0;
>>           reg |= 0xfff0;
>>           __raw_writew(reg, MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + MX27_SYS_PSCR));
>>
>>
>> Any successions?
>>
>> Regards
>> Chris
>> --
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