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Message-ID: <5dc0b50c-611a-187a-2f91-dec0dcecde78@linaro.org>
Date:   Fri, 9 Jun 2023 21:31:03 +0200
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Subject: Re: [PATCH v3 2/2] NFC: nxp-nci: Add pad supply voltage pvdd-supply
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To:     Raymond Hackley <raymondhackley@protonmail.com>,
        linux-kernel@vger.kernel.org
Cc:     "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Michael Walle <michael@walle.cc>,
        =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <u.kleine-koenig@pengutronix.de>,
        Jeremy Kerr <jk@codeconstruct.com.au>, netdev@vger.kernel.org,
        devicetree@vger.kernel.org
References: <20230609182639.85034-1-raymondhackley@protonmail.com>
 <20230609182729.85088-1-raymondhackley@protonmail.com>
 <20230609182729.85088-2-raymondhackley@protonmail.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <20230609182729.85088-2-raymondhackley@protonmail.com>
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On 09/06/2023 20:28, Raymond Hackley wrote:
> PN547/553, QN310/330 chips on some devices require a pad supply voltage
> (PVDD). Otherwise, the NFC won't power up.
> 
> Implement support for pad supply voltage pvdd-supply that is enabled by
> the nxp-nci driver so that the regulator gets enabled when needed.
> 
> Signed-off-by: Raymond Hackley <raymondhackley@protonmail.com>
> ---
>  drivers/nfc/nxp-nci/i2c.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c
> index d4c299be7949..6f01152d2c83 100644
> --- a/drivers/nfc/nxp-nci/i2c.c
> +++ b/drivers/nfc/nxp-nci/i2c.c
> @@ -35,6 +35,7 @@ struct nxp_nci_i2c_phy {
>  
>  	struct gpio_desc *gpiod_en;
>  	struct gpio_desc *gpiod_fw;
> +	struct regulator *pvdd;
>  
>  	int hard_fault; /*
>  			 * < 0 if hardware error occurred (e.g. i2c err)
> @@ -263,6 +264,20 @@ static const struct acpi_gpio_mapping acpi_nxp_nci_gpios[] = {
>  	{ }
>  };
>  
> +static void nxp_nci_i2c_poweroff(void *data)
> +{
> +	struct nxp_nci_i2c_phy *phy = data;
> +	struct device *dev = &phy->i2c_dev->dev;
> +	struct regulator *pvdd = phy->pvdd;
> +	int r;
> +
> +	if (!IS_ERR(pvdd) && regulator_is_enabled(pvdd)) {

No, don't send a new version before we finish discussion. One version
per day is enough.

NAK for this part, same reasons as before.


Best regards,
Krzysztof