[PATCH 0/3] pinctrl: qcom: enable generic pinconf and input-enable

[PATCH 0/3] pinctrl: qcom: enable generic pinconf and input-enable

[Stanimir Varbanov]

Here is splitted version of the previous patch at [1].

The major change is in 3/3 where now we check oe_bit in control register
instead of in_bit in io register.

regards
Stan

[1] https://lkml.org/lkml/2015/1/26/514

Stanimir Varbanov (3):
  pinctrl: qcom: delete pin_config_get/set pinconf operations
  pinctrl: qcom: enable generic pinconf
  pinctrl: qcom: handle input-enable pinconf property

 drivers/pinctrl/qcom/pinctrl-msm.c |   32 ++++++++++++--------------------
 1 files changed, 12 insertions(+), 20 deletions(-)

[PATCH 1/3] pinctrl: qcom: delete pin_config_get/set pinconf operations

[Stanimir Varbanov]

The .pin_config_get/set operation are not supported in qcom pinctrl
driver. As the pinconf core is smart enough it doesn't complain
about that.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
---
 drivers/pinctrl/qcom/pinctrl-msm.c |   17 -----------------
 1 files changed, 0 insertions(+), 17 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index e730935..49d3f4f 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -204,21 +204,6 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 	return 0;
 }
 
-static int msm_config_get(struct pinctrl_dev *pctldev,
-			  unsigned int pin,
-			  unsigned long *config)
-{
-	dev_err(pctldev->dev, "pin_config_set op not supported\n");
-	return -ENOTSUPP;
-}
-
-static int msm_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
-				unsigned long *configs, unsigned num_configs)
-{
-	dev_err(pctldev->dev, "pin_config_set op not supported\n");
-	return -ENOTSUPP;
-}
-
 #define MSM_NO_PULL	0
 #define MSM_PULL_DOWN	1
 #define MSM_KEEPER	2
@@ -372,8 +357,6 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 }
 
 static const struct pinconf_ops msm_pinconf_ops = {
-	.pin_config_get		= msm_config_get,
-	.pin_config_set		= msm_config_set,
 	.pin_config_group_get	= msm_config_group_get,
 	.pin_config_group_set	= msm_config_group_set,
 };
-- 
1.7.0.4

[PATCH 2/3] pinctrl: qcom: enable generic pinconf

[Stanimir Varbanov]

This makes the pinctrl driver to use the generic pinconf
interface. Mainly it gives us a way to use debugfs to dump
group configurations.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
---
 drivers/pinctrl/qcom/pinctrl-msm.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 49d3f4f..b66cd58 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -197,7 +197,6 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 		*mask = 1;
 		break;
 	default:
-		dev_err(pctrl->dev, "Invalid config param %04x\n", param);
 		return -ENOTSUPP;
 	}
 
@@ -262,8 +261,6 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 		arg = !!(val & BIT(g->in_bit));
 		break;
 	default:
-		dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
-			param);
 		return -EINVAL;
 	}
 
@@ -357,6 +354,7 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 }
 
 static const struct pinconf_ops msm_pinconf_ops = {
+	.is_generic		= true,
 	.pin_config_group_get	= msm_config_group_get,
 	.pin_config_group_set	= msm_config_group_set,
 };
-- 
1.7.0.4

[PATCH 3/3] pinctrl: qcom: handle input-enable pinconf property

[Stanimir Varbanov]

This enables support of 'input-enable' pinconf generic property in
the pinctrl driver.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
---
 drivers/pinctrl/qcom/pinctrl-msm.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index b66cd58..55a64ea 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -193,6 +193,7 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 		*mask = 7;
 		break;
 	case PIN_CONFIG_OUTPUT:
+	case PIN_CONFIG_INPUT_ENABLE:
 		*bit = g->oe_bit;
 		*mask = 1;
 		break;
@@ -260,6 +261,12 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 		val = readl(pctrl->regs + g->io_reg);
 		arg = !!(val & BIT(g->in_bit));
 		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		/* Pin is output */
+		if (arg)
+			return -EINVAL;
+		arg = 1;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -330,6 +337,10 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 			/* enable output */
 			arg = 1;
 			break;
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* disable output */
+			arg = 0;
+			break;
 		default:
 			dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 				param);
-- 
1.7.0.4

Re: [PATCH 1/3] pinctrl: qcom: delete pin_config_get/set pinconf operations

[Linus Walleij]

On Fri, Jan 30, 2015 at 11:27 AM, Stanimir Varbanov
<svarbanov@mm-sol.com> wrote:

> The .pin_config_get/set operation are not supported in qcom pinctrl
> driver. As the pinconf core is smart enough it doesn't complain
> about that.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>

Patch applied as it is obviously correct.

Yours,
Linus Walleij

Re: [PATCH 2/3] pinctrl: qcom: enable generic pinconf

[Linus Walleij]

On Fri, Jan 30, 2015 at 11:27 AM, Stanimir Varbanov
<svarbanov@mm-sol.com> wrote:

> This makes the pinctrl driver to use the generic pinconf
> interface. Mainly it gives us a way to use debugfs to dump
> group configurations.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>

Nice! Looking for Björn's review though.

> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -197,7 +197,6 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
>                 *mask = 1;
>                 break;
>         default:
> -               dev_err(pctrl->dev, "Invalid config param %04x\n", param);
>                 return -ENOTSUPP;
>         }
>
> @@ -262,8 +261,6 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
>                 arg = !!(val & BIT(g->in_bit));
>                 break;
>         default:
> -               dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
> -                       param);
>                 return -EINVAL;

Please change this one to -ENOTSUPP as well in this patch.

Apart from that it looks good to me.

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH 2/3] pinctrl: qcom: enable generic pinconf

[Linus Walleij]

On Fri, Jan 30, 2015 at 11:27 AM, Stanimir Varbanov
<svarbanov@mm-sol.com> wrote:

> This makes the pinctrl driver to use the generic pinconf
> interface. Mainly it gives us a way to use debugfs to dump
> group configurations.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>

Nice! Looking for Björn's review though.

> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -197,7 +197,6 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
>                 *mask = 1;
>                 break;
>         default:
> -               dev_err(pctrl->dev, "Invalid config param %04x\n", param);
>                 return -ENOTSUPP;
>         }
>
> @@ -262,8 +261,6 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
>                 arg = !!(val & BIT(g->in_bit));
>                 break;
>         default:
> -               dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
> -                       param);
>                 return -EINVAL;

Please change this one to -ENOTSUPP as well in this patch.

Apart from that it looks good to me.

Yours,
Linus Walleij

Re: [PATCH 3/3] pinctrl: qcom: handle input-enable pinconf property

[Bjorn Andersson]

On Fri 30 Jan 02:27 PST 2015, Stanimir Varbanov wrote:

> This enables support of 'input-enable' pinconf generic property in
> the pinctrl driver.

Patch looks good, but I think the api is broken for boolean properties.

> 
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
> ---
>  drivers/pinctrl/qcom/pinctrl-msm.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index b66cd58..55a64ea 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -193,6 +193,7 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
>  		*mask = 7;
>  		break;
>  	case PIN_CONFIG_OUTPUT:
> +	case PIN_CONFIG_INPUT_ENABLE:
>  		*bit = g->oe_bit;
>  		*mask = 1;
>  		break;
> @@ -260,6 +261,12 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
>  		val = readl(pctrl->regs + g->io_reg);
>  		arg = !!(val & BIT(g->in_bit));
>  		break;
> +	case PIN_CONFIG_INPUT_ENABLE:
> +		/* Pin is output */
> +		if (arg)
> +			return -EINVAL;
> +		arg = 1;
> +		break;

My idea of this function is to query if we have the specific option
enabled, so I don't like the fact that we're returning an error here, we
should just return 0 with arg 0 (or something like that).

However, that would not give the results we expect and your patch is
"correct".

Linus, conf_items in pinconf_generic_dump_one() seems to represent
boolean properties of the pins. Returning 0 from pin_config_*_get()
should in my view then be treated as it not being active.

Is this in line with your view and should we modify
pinconf_generic_dump_one() to continue for these values if the getter
returns 0?


If not, at least all the bias properties here should return -EINVAL as
well. (which I think is wrong)

>  	default:
>  		return -EINVAL;
>  	}
> @@ -330,6 +337,10 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
>  			/* enable output */
>  			arg = 1;
>  			break;
> +		case PIN_CONFIG_INPUT_ENABLE:
> +			/* disable output */
> +			arg = 0;
> +			break;
>  		default:
>  			dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
>  				param);

Regards,
Bjorn

Re: [PATCH 3/3] pinctrl: qcom: handle input-enable pinconf property

[Linus Walleij]

On Fri, Jan 30, 2015 at 5:20 PM, Bjorn Andersson
<bjorn.andersson@sonymobile.com> wrote:
> On Fri 30 Jan 02:27 PST 2015, Stanimir Varbanov wrote:
>
>> +     case PIN_CONFIG_INPUT_ENABLE:
>> +             /* Pin is output */
>> +             if (arg)
>> +                     return -EINVAL;
>> +             arg = 1;
>> +             break;
>
> My idea of this function is to query if we have the specific option
> enabled, so I don't like the fact that we're returning an error here, we
> should just return 0 with arg 0 (or something like that).
>
> However, that would not give the results we expect and your patch is
> "correct".
>
> Linus, conf_items in pinconf_generic_dump_one() seems to represent
> boolean properties of the pins. Returning 0 from pin_config_*_get()
> should in my view then be treated as it not being active.
>
> Is this in line with your view and should we modify
> pinconf_generic_dump_one() to continue for these values if the getter
> returns 0?
>
> If not, at least all the bias properties here should return -EINVAL as
> well. (which I think is wrong)

Well currently the semantics are:

- ENOTSUPP = this property is not even supported
- EINVAL       = this value exists but can not be determined

It has this form primarily to serve the non-boolean properties.
For example pull-up can return -EINVAL if pull-up is supported
but pull-down is currently active, so it cannot say what
resistance it is pulled up with, as it is "infinite" (NAN,
thus translated -EINVAL).

It just folds over to the boolean props doing things in the
same way to simplify things... -EINVAL just means
"false". If we should return 1/0 from boolean props we need
to handle them as a special case in the pinconf-generic.
code, by extending the struct pinconf_generic_params,
which is possible of course.

Further: as of now pinconf_generic_dump_one() doesn't print
anything for inactive pulls etc return -EINVAL, but maybe
it should? It was just handy on some system to only see
the stuff that was really active, not to get a list of stuff that
was not active as well.

Yours,
Linus Walleij

Re: [PATCH 3/3] pinctrl: qcom: handle input-enable pinconf property

[Bjorn Andersson]

On Wed, Feb 4, 2015 at 2:03 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> On Fri, Jan 30, 2015 at 5:20 PM, Bjorn Andersson
> <bjorn.andersson@sonymobile.com> wrote:
>> On Fri 30 Jan 02:27 PST 2015, Stanimir Varbanov wrote:
>>
>>> +     case PIN_CONFIG_INPUT_ENABLE:
>>> +             /* Pin is output */
>>> +             if (arg)
>>> +                     return -EINVAL;
>>> +             arg = 1;
>>> +             break;
>>
>> My idea of this function is to query if we have the specific option
>> enabled, so I don't like the fact that we're returning an error here, we
>> should just return 0 with arg 0 (or something like that).
>>
>> However, that would not give the results we expect and your patch is
>> "correct".
>>
>> Linus, conf_items in pinconf_generic_dump_one() seems to represent
>> boolean properties of the pins. Returning 0 from pin_config_*_get()
>> should in my view then be treated as it not being active.
>>
>> Is this in line with your view and should we modify
>> pinconf_generic_dump_one() to continue for these values if the getter
>> returns 0?
>>
>> If not, at least all the bias properties here should return -EINVAL as
>> well. (which I think is wrong)
>
> Well currently the semantics are:
>
> - ENOTSUPP = this property is not even supported
> - EINVAL       = this value exists but can not be determined
>
> It has this form primarily to serve the non-boolean properties.
> For example pull-up can return -EINVAL if pull-up is supported
> but pull-down is currently active, so it cannot say what
> resistance it is pulled up with, as it is "infinite" (NAN,
> thus translated -EINVAL).
>

That makes sense, however according to both the dt binding and
pinconf-generic e.g. pull up is a boolean property. And "input-enable"
can always be queried (at least in our case).

> It just folds over to the boolean props doing things in the
> same way to simplify things... -EINVAL just means
> "false". If we should return 1/0 from boolean props we need
> to handle them as a special case in the pinconf-generic.
> code, by extending the struct pinconf_generic_params,
> which is possible of course.
>

That's what I figured. But I would like to argue that it's not
completely intuitive.
Don't we have all the info we need already? See below.

> Further: as of now pinconf_generic_dump_one() doesn't print
> anything for inactive pulls etc return -EINVAL, but maybe
> it should? It was just handy on some system to only see
> the stuff that was really active, not to get a list of stuff that
> was not active as well.
>

That's the way it should be, so any changes to the API would need to
retain this behavior. Something like adding:

if (!pinconf_to_config_argument(config) && !conf_items[i].has_arg)
    continue;


But unless we expect any other users of this api I think we could just
leave it. I mostly wanted to clarify what the current expectations
was. Let me know if you want a patch.

Regards,
Bjorn