linux-kernel - Re: [PATCH 6/6] pinctrl: tegra: Add driver to configure voltage and power state of io pads

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Date:	Thu, 12 May 2016 20:48:26 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>, <swarren@...dotorg.org>,
	<linus.walleij@...aro.org>, <gnurou@...il.com>,
	<robh+dt@...nel.org>, <mark.rutland@....com>,
	<thierry.reding@...il.com>
CC:	<linux-tegra@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 6/6] pinctrl: tegra: Add driver to configure voltage and
 power state of io pads


On 02/05/16 13:17, Laxman Dewangan wrote:
> NVIDIA Tegra210 supports the IO pads which can operate at 1.8V
> or 3.3V I/O voltage levels. Also the IO pads can be configured
> for power down state if it is not used. SW needs to configure the
> voltage level of IO pads based on IO rail voltage and its power
> state based on platform usage.
> 
> The voltage and power state configurations of pads are provided
> through pin control frameworks. Add pin control driver for Tegra's
> IO pads' voltage and power state configurations.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> 
> ---
> Changes from V1:
> - Use the generic pincontrol property for low power enable/disable.
> - sync with latest and remove all MODULE* macros
> - Use renamed APIs form PMC
> ---
>  drivers/pinctrl/tegra/Makefile                  |   1 +
>  drivers/pinctrl/tegra/pinctrl-tegra210-io-pad.c | 301 ++++++++++++++++++++++++
>  2 files changed, 302 insertions(+)
>  create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra210-io-pad.c

[snip]

> +static int tegra_io_pad_pinconf_get(struct pinctrl_dev *pctldev,
> +				    unsigned int pin, unsigned long *config)
> +{
> +	struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> +	int param = pinconf_to_config_param(*config);
> +	struct tegra_io_pads_cfg_info *pad_cfg = &tiopi->pads_cfg[pin];
> +	int pad_id = pad_cfg->pad_id;
> +	int arg = 0;
> +	int ret;
> +
> +	switch (param) {
> +	case TEGRA_IO_PAD_POWER_SOURCE_VOLTAGE:
> +		ret = tegra_io_pads_get_configured_voltage(pad_id);
> +		if (ret < 0)
> +			return ret;
> +		arg = (ret =  3300000) ? 1 : 0;

This should be (ret == 3300000).

Cheers
Jon