linux-kernel - Re: [PATCH v2 1/3] pinctrl: qcom: Add APQ8084 pinctrl support

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Message-ID: <20140829060059.GG12494@sonymobile.com>
Date:	Thu, 28 Aug 2014 23:01:00 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Georgi Djakov <gdjakov@...sol.com>
CC:	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"agross@...eaurora.org" <agross@...eaurora.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"iivanov@...sol.com" <iivanov@...sol.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] pinctrl: qcom: Add APQ8084 pinctrl support

On Tue 26 Aug 05:45 PDT 2014, Georgi Djakov wrote:

Hi Georgi,

Sorry for missing this before, but I did a quick walkthrough and unfortunately
the gpio configuration needs a few updates.

> diff --git a/drivers/pinctrl/qcom/pinctrl-apq8084.c b/drivers/pinctrl/qcom/pinctrl-apq8084.c
[...]
> +
> +#define PINGROUP(id, f1, f2, f3, f4, f5, f6, f7)        \
> +       {                                               \
> +               .name = "gpio" #id,                     \
> +               .pins = gpio##id##_pins,                \
> +               .npins = ARRAY_SIZE(gpio##id##_pins),   \
> +               .funcs = (int[]){                       \
> +                       APQ_MUX_gpio,                   \
> +                       APQ_MUX_##f1,                   \
> +                       APQ_MUX_##f2,                   \
> +                       APQ_MUX_##f3,                   \
> +                       APQ_MUX_##f4,                   \
> +                       APQ_MUX_##f5,                   \
> +                       APQ_MUX_##f6,                   \
> +                       APQ_MUX_##f7                    \
> +               },                                      \
> +               .nfuncs = 8,                            \
> +               .ctl_reg = 0x1000 + 0x10 * id,          \
> +               .io_reg = 0x1004 + 0x10 * id,           \
> +               .intr_cfg_reg = 0x1008 + 0x10 * id,     \
> +               .intr_status_reg = 0x100c + 0x10 * id,  \
> +               .intr_target_reg = 0x400 + 0x4 * id,    \

The routing of the interrupt is specified in TLMM_GPIO_INTR_CFG(n),
i.e: 0x1008 + 0x10 * n

Apparently the HW guys wanted to give us more work, so in 8084 they use 3 to
specify routing the interrupts to KPSS, instead of the previous 4. So the
static define of INTR_TARGET_PROC_APPS is no longer adequate.

My suggestion is that you create an additional patch and add to your series
that moves todays hardcoded 4 into the soc_data for the existing platforms (or
include it in this struct).

> +               .mux_bit = 2,                           \
> +               .pull_bit = 0,                          \
> +               .drv_bit = 6,                           \
> +               .oe_bit = 9,                            \
> +               .in_bit = 0,                            \
> +               .out_bit = 1,                           \
> +               .intr_enable_bit = 0,                   \
> +               .intr_status_bit = 0,                   \
> +               .intr_ack_high = 1,                     \

With the 8084 TLMM chip you ack the interrupt status by clearing this bit, so
intr_ack_high should be 0.

> +               .intr_target_bit = 0,                   \

Target bit is 5.

> +               .intr_raw_status_bit = 3,               \

Raw interrupt status bit is 4.

> +               .intr_polarity_bit = 1,                 \
> +               .intr_detection_bit = 2,                \
> +               .intr_detection_width = 1,              \

You can do level, raise, fall and both edge detection with 8084, so the width
of his part is 2.

> +       }
> +

Regards,
Bjorn
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