linux-kernel - Re: [PATCH v3 1/6] pinctrl: Device tree bindings for Qualcomm pm8xxx gpio block

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Date:	Sat, 16 Aug 2014 16:24:06 +0100
From:	Daniel <delta.tatham@...com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] pinctrl: Device tree bindings for Qualcomm pm8xxx
 gpio block

@Ivan: sorry about the double post.

Am 11.08.2014 um 16:40 schrieb Ivan T. Ivanov <iivanov@...sol.com>:
> diff --git a/include/dt-bindings/pinctrl/qcom,pmic-gpio.h b/include/dt-bindings/pinctrl/qcom,pmic-gpio.h
> new file mode 100644
> index 0000000..994e748
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/qcom,pmic-gpio.h
> @@ -0,0 +1,107 @@
> +/*
> + * This header provides constants for the Qualcomm PMIC gpio binding.
> + */
> +
> +#ifndef _DT_BINDINGS_PINCTRL_QCOM_PMIC_GPIO_H
> +#define _DT_BINDINGS_PINCTRL_QCOM_PMIC_GPIO_H
> +
> +#define PMIC_GPIO_PULL_UP_30		1
> +#define PMIC_GPIO_PULL_UP_1P5		2
> +#define PMIC_GPIO_PULL_UP_31P5		3
> +#define PMIC_GPIO_PULL_UP_1P5_30	4

Looking at drivers/pinctrl/qcom/pinctrl-ssbi-pmic.c, shouldn't these defines start at 0?
e.g. #define PMIC_GPIO_PULL_UP_30 	0

after shifting those 4 defines by -1, /sys/kernel/debug/gpio gives me the proper values for the pins configured to be pull-up:

cat /sys/kernel/debug/gpio
GPIOs 212-255, platform/500000.qcom,ssbi:pmic@0:gpio@150, 500000.qcom,ssbi:pmic@0:gpio@150:
...
gpio4 : in   normal  VIN2 pull-up 30uA                push-pull  low  no      inverted
...
gpio38: in   normal  VIN2 pull-up 30uA                push-pull  low  no      inverted
...
____
dts:
[snip]
                                        pm8921_gpio_keys: gpio-keys {
                                                volume-keys {
                                                        pins = "gpio4", "gpio38";
                                                        function = PMIC_GPIO_FUNC_NORMAL;

                                                        input-enable;
                                                        drive-push-pull;
                                                        qcom,pull-up-strength = <PMIC_GPIO_PULL_UP_30>;
                                                        qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
                                                        power-source = <PM8921_GPIO_S4>;
                                                };
                                        };
[/snip]

However, I still cannot get any data from those 2 pins if I export them through /sys/class/gpio...

Device: Nexus 7 2013 WiFi
Board: APQ8064

Cheers,
D--
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