linux-kernel - Re: [PATCH 1/2] pinctrl: qcom: msm8226: Add MPM pin mappings

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Date:   Sat, 23 Sep 2023 11:32:47 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     linux-arm-msm@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Matti Lehtimäki <matti.lehtimaki@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matti Lehtimäki <matti.lehtimaki@...il.com>
Subject: Re: [PATCH 1/2] pinctrl: qcom: msm8226: Add MPM pin mappings

Hi Matti,

On Samstag, 23. September 2023 00:40:26 CEST Matti Lehtimäki wrote:
> Add pin <-> wakeirq mappings to allow for waking up the AP from sleep
> through MPM-connected pins.
> 
> Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> ---
>  drivers/pinctrl/qcom/pinctrl-msm8226.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm8226.c
> b/drivers/pinctrl/qcom/pinctrl-msm8226.c index 994619840a70..1e46a9ab382f
> 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm8226.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm8226.c
> @@ -612,6 +612,16 @@ static const struct msm_pingroup msm8226_groups[] = {
> 
>  #define NUM_GPIO_PINGROUPS 117
> 
> +static const struct msm_gpio_wakeirq_map msm8226_mpm_map[] = {
> +	{ 1, 3 }, { 4, 4 }, { 5, 5 }, { 9, 6 }, { 13, 7 }, { 17, 8 },

I'm not really convinced this is the correct order of values...

Let's look at downstream:

  qcom,gpio-map = <3  1>,
                  <4  4 >,
                  <5  5 >,
                  <6  9 >,
                  [...]

From Documentation/devicetree/bindings/arm/msm/mpm.txt downstream:

  Each tuple represents a MPM pin and which GIC interrupt is routed to it.

So first is pin number, second is interrupt number.

And check mainline: 

  /**
   * struct msm_gpio_wakeirq_map - Map of GPIOs and their wakeup pins
   * @gpio:          The GPIOs that are wakeup capable
   * @wakeirq:       The interrupt at the always-on interrupt controller
   */
  struct msm_gpio_wakeirq_map {
  	unsigned int gpio;
  	unsigned int wakeirq;
  };

So here we also have the order pin-interrupt, not the reverse order.

Therefore I believe the order in this patch is incorrect, and it should rather 
be:

  { 3, 1 }, { 4, 4 }, { 5, 5 }, { 6, 9 }, { 7, 13 }, { 8, 17 },
  [...]

Or do you think I'm missing something?

Regards
Luca

> +	{ 21, 9 }, { 27, 10 }, { 29, 11 }, { 31, 12 }, { 33, 13 }, { 35, 14 
},
> +	{ 37, 15 }, { 38, 16 }, { 39, 17 }, { 41, 18 }, { 46, 19 }, { 48, 20 
},
> +	{ 49, 21 }, { 50, 22 }, { 51, 23 }, { 52, 24 }, { 54, 25 }, { 62, 26 
},
> +	{ 63, 27 }, { 64, 28 }, { 65, 29 }, { 66, 30 }, { 67, 31 }, { 68, 32 
},
> +	{ 69, 33 }, { 71, 34 }, { 72, 35 }, { 106, 36 }, { 107, 37 },
> +	{ 108, 38 }, { 109, 39 }, { 110, 40 }, { 111, 54 }, { 113, 55 },
> +};
> +
>  static const struct msm_pinctrl_soc_data msm8226_pinctrl = {
>  	.pins = msm8226_pins,
>  	.npins = ARRAY_SIZE(msm8226_pins),
> @@ -620,6 +630,8 @@ static const struct msm_pinctrl_soc_data msm8226_pinctrl
> = { .groups = msm8226_groups,
>  	.ngroups = ARRAY_SIZE(msm8226_groups),
>  	.ngpios = NUM_GPIO_PINGROUPS,
> +	.wakeirq_map = msm8226_mpm_map,
> +	.nwakeirq_map = ARRAY_SIZE(msm8226_mpm_map),
>  };
> 
>  static int msm8226_pinctrl_probe(struct platform_device *pdev)