linux-kernel - Re: [PATCH] NFC: trf7970a: disable all regulators on removal

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Date: Wed, 17 Apr 2024 15:15:21 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Paul Geurts <paul_geurts@...e.nl>, mgreer@...malcreek.com,
 linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFC: trf7970a: disable all regulators on removal

On 16/04/2024 22:28, Paul Geurts wrote:
> During module probe, regulator 'vin' and 'vdd-io' are used and enabled,
> but the vdd-io regulator overwrites the 'vin' regulator pointer. During
> remove, only the vdd-io is disabled, as the vin regulator pointer is not
> available anymore. When regulator_put() is called during resource
> cleanup a kernel warning is given, as the regulator is still enabled.
> 
> Store the two regulators in separate pointers and disable both the
> regulators on module remove.
> 
> Fixes: 49d22c70aaf0 ("NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage")
> 
> Signed-off-by: Paul Geurts <paul_geurts@...e.nl>

No blank lines between tags. Please look at existing commits (git log).

> ---
>  drivers/nfc/trf7970a.c | 42 +++++++++++++++++++++++-------------------
>  1 file changed, 23 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
> index 7eb17f46a815..9e1a34e23af2 100644
> --- a/drivers/nfc/trf7970a.c
> +++ b/drivers/nfc/trf7970a.c
> @@ -424,7 +424,8 @@ struct trf7970a {
>  	enum trf7970a_state		state;
>  	struct device			*dev;
>  	struct spi_device		*spi;
> -	struct regulator		*regulator;
> +	struct regulator		*vin_regulator;
> +	struct regulator		*vddio_regulator;
>  	struct nfc_digital_dev		*ddev;
>  	u32				quirks;
>  	bool				is_initiator;
> @@ -1883,7 +1884,7 @@ static int trf7970a_power_up(struct trf7970a *trf)
>  	if (trf->state != TRF7970A_ST_PWR_OFF)
>  		return 0;
>  
> -	ret = regulator_enable(trf->regulator);
> +	ret = regulator_enable(trf->vin_regulator);

That does not look like equivalent code. Previously this was vddio, right?


Best regards,
Krzysztof