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SubjectRe: [PATCH RESEND v2 1/4] pinctrl: Update Qualcomm pm8xxx GPIO parameters definitions
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Hi,

I have accidentally pressed send in the earlier message.

On Wed, 2014-07-23 at 15:47 +0300, Ivan T. Ivanov wrote:
> On Tue, 2014-07-22 at 14:46 -0700, Bjorn Andersson wrote:
> > On Thu, Jul 17, 2014 at 12:41 PM, Ivan T. Ivanov <iivanov@mm-sol.com> wrote:
> > > From: "Ivan T. Ivanov" <iivanov@mm-sol.com>
> > >
> >
> > Hi Ivan,
> >
> > Sorry for the slow response, I wanted to respin my pm8xxx-gpio driver to figure
> > out some resonable answers to you.
> >
>
> <snip>
>
> >
> > > PM8018, PM8038, PM8058, PM8917, PM8921 pin controller hardware
> > > support only one function 'gpio'. Currently GPIO's will
> > > support only 'normal' mode. Rest of the modes will be added
> > > later, if needed.
> > >
> >
> > This is not true.
> >
> > As I said before, there is no such thing as "pin controller hardware";

This is matter of interpretation :-)

> both on
> > pm8xxx and qpnp-pin there are two different HW blocks, one for GPIO and one for
> > MPP. And if you look in your pinconf_set function you will see that they are
> > very different.

I bet that the hardware blocks are almost identical, just register
map is different.

> >
> > I'm still trying to figure out the correct pinmux mapping for the various
> > pmics, but the current indication is a list that looks like this:
> > "gpio"
> > "paired"
> > "ext_reg_en"
> > "ext_smps_en"
> > "fclk"
> > "kypd_drv"
> > "kypd_sns"
> > "lpa"
> > "lpg"
> > "mp3_clk"
> > "sleep_clk"
> > "uart"
> > "uim"
> > "upl"
> >

Ok, I see. But lets make things simpler.

It seems that "uim" could be "SDC_UIM_VBIAS" on DB8074, which looks like MPP in
analog-output mode/function, with additional selection for voltage level (qcom,aout?)

Closest to "uart" function, that I have found, is that one of the SPI buses on the
above board is level translated trough several MPP's, but this still did not make them
act like a UART.

However, I seems that some of the GPIO's could act like clock and PWM sources.

> > I haven't looked through the dts files for 8974 and 8084, but it's not possible
> > to describe the previous Qualcomm reference formfactor devices (MTP) with only
> > "gpio".

I believe that these DTS files are using qcom,mode(DIG_IN|DIG_OUT|AIN|AOUT..) and
qcom,src-sel to select desired function. For example:

apq8074-dragonboard:
/* GPIO 1 */
qcom,mode = <0>
qcom,src-sel = <0>

apq8084-cdp:
qcom,mode = <1>; /* Digital output */
qcom,src-sel = <2>; /* Special Function 1=LPG 3 */

apq8084-mtp:
/* NFC clk request */
qcom,mode = <0>; /* QPNP_PIN_MODE_DIG_IN */
qcom,src-sel = <2>; /* QPNP_PIN_SEL_FUNC_1 */

apq8084-sbc:
/* BACKLIGHT2_PWM */
qcom,mode = <1>; /* Digital output */
qcom,src-sel = <2>; /* Special Function 1=LPG 5 */

apq8084-sbc:
/* DIV_CLK3 SLEEP_CLK */
qcom,mode = <1>; /* Digital output */
qcom,src-sel = <3>; /* Function 2 */

...

I could just guess what the functions 1 and 2 means.

In which case GPIO functions could be gpio, keypad, clk, pwm/lpg, ...

Rest of the pinctrl parameters prosed looks fine.

Thanks,
Ivan




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