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

[Chris Ruehl <chris.ruehl-CR359r9tUDPXPF5Rlphj1Q@public.gmane.org>]

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
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