linux-kernel - Re: [PATCH 2/3] pinctrl: qcom-spmi-gpio: Fix input value report

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Date:	Thu, 9 Apr 2015 09:01:11 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 2/3] pinctrl: qcom-spmi-gpio: Fix input value report

On Thu 09 Apr 08:18 PDT 2015, Ivan T. Ivanov wrote:

> Read input buffer when input is enabled, not when it is
> disabled. Also fix interpretation of the pmic_gpio_read()
> return code, negative value means an error.
> 
> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> ---

>  drivers/pinctrl/qcom/pinctrl-spmi-gpio.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
> index 4b21aac..e8b74c6 100644
> --- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
> +++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
> @@ -466,12 +466,13 @@ static void pmic_gpio_config_dbg_show(struct pinctrl_dev *pctldev,
>  		seq_puts(s, " ---");
>  	} else {
> 
> -		if (!pad->input_enabled) {
> +		if (pad->input_enabled) {
>  			ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS);
> -			if (!ret) {
> -				ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
> -				pad->out_value = ret;
> -			}
> +			if (ret < 0)
> +				return;
> +
> +			ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
> +			pad->out_value = ret;

I'm not too happy on pmic_gpio_read() returning the register value as an
signed int, sorry for not picking on this back when we merged the
driver.

As far as I can see bit 31 is reserved in all registers in the block
though, so there shouldn't be any practical issues with this _today_.

But please consider revising pmic_gpio_read() to take a u32* parameter
for the data instead.

Reviewed-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>

Regards,
Bjorn

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