linux-kernel - Re: [PATCH] pinctrl: msm: Add check for pinctrl group is valid

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Date:   Mon, 18 May 2020 18:38:13 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Mayank Grover <groverm@...eaurora.org>, linus.walleij@...aro.org
Cc:     agross@...nel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        neeraju@...eaurora.org
Subject: Re: [PATCH] pinctrl: msm: Add check for pinctrl group is valid

On Mon 18 May 08:50 PDT 2020, Mayank Grover wrote:

> The list of reserved gpio pins for platform are populated
> in gpiochip valid_mask.
> 
> Here on MSM common driver introduce ability to check if
> pingroup is valid, by parsing pins in pingroup against
> reserved pins for gpios. This does not handle non-gpio
> pingroups.
> 

Thanks Mayank, I can confirm that this is a problem, but don't we need
this on some of the pinmux_ops as well?

@Linus, we started off with something similar for GPIOs and ended up
with the logic in the core code. Should we somehow try to do the same
for pinctrl?

Regards,
Bjorn

> Signed-off-by: Mayank Grover <groverm@...eaurora.org>
> ---
>  drivers/pinctrl/qcom/pinctrl-msm.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 85858c1..b6ebe26 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -261,6 +261,24 @@ static unsigned msm_regval_to_drive(u32 val)
>  	return (val + 1) * 2;
>  }
>  
> +static bool msm_pingroup_is_valid(struct msm_pinctrl *pctrl,
> +				  const struct msm_pingroup *g)
> +{
> +	const unsigned int *pins = g->pins;
> +	unsigned int num_pins = g->npins;
> +	struct gpio_chip *chip = &pctrl->chip;
> +	unsigned int max_gpios = chip->ngpio;
> +	unsigned int i;
> +
> +	for (i = 0; i < num_pins; i++) {
> +		/* Doesn't handle non-gpio pingroups */
> +		if (pins[i] < max_gpios &&
> +		    !gpiochip_line_is_valid(chip, pins[i]))
> +			return false;
> +	}
> +	return true;
> +}
> +
>  static int msm_config_group_get(struct pinctrl_dev *pctldev,
>  				unsigned int group,
>  				unsigned long *config)
> @@ -276,6 +294,10 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
>  
>  	g = &pctrl->soc->groups[group];
>  
> +	/* Check if group has all valid pins */
> +	if (!msm_pingroup_is_valid(pctrl, g))
> +		return -EINVAL;
> +
>  	ret = msm_config_reg(pctrl, g, param, &mask, &bit);
>  	if (ret < 0)
>  		return ret;
> @@ -355,6 +377,10 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
>  
>  	g = &pctrl->soc->groups[group];
>  
> +	/* Check if group has all valid pins */
> +	if (!msm_pingroup_is_valid(pctrl, g))
> +		return -EINVAL;
> +
>  	for (i = 0; i < num_configs; i++) {
>  		param = pinconf_to_config_param(configs[i]);
>  		arg = pinconf_to_config_argument(configs[i]);
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
> member of the Code Aurora Forum, hosted by The Linux Foundation