linux-kernel - Re: [PATCH v3 7/8] mikrobus: Add mikrobus driver

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Date: Fri, 15 Mar 2024 19:03:57 +0000
From: Mark Brown <broonie@...nel.org>
To: Ayush Singh <ayushdevel1325@...il.com>
Cc: linux-kernel@...r.kernel.org, jkridner@...gleboard.org,
	robertcnelson@...gleboard.org,
	Vaishnav M A <vaishnav@...gleboard.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jiri Slaby <jirislaby@...nel.org>, Johan Hovold <johan@...nel.org>,
	Alex Elder <elder@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
	linux-serial@...r.kernel.org, greybus-dev@...ts.linaro.org
Subject: Re: [PATCH v3 7/8] mikrobus: Add mikrobus driver

On Sat, Mar 16, 2024 at 12:19:05AM +0530, Ayush Singh wrote:

> +	if (dev->regulators) {
> +		if (dev->protocol == GREYBUS_PROTOCOL_SPI) {
> +			snprintf(devname, sizeof(devname), "%s.%u", dev_name(&port->spi_ctrl->dev),
> +				 port->chip_select[dev->reg]);
> +			regulator.dev_name = kmemdup(devname, MIKROBUS_NAME_SIZE, GFP_KERNEL);
> +		} else if (dev->protocol == GREYBUS_PROTOCOL_RAW) {

It looks like you're trying to write a switch statement here...

> +		for (i = 0; i < dev->num_regulators; i++) {
> +			val = dev->regulators[i].value.u64_data;
> +			regulator.supply =
> +				kmemdup(dev->regulators[i].name, MIKROBUS_NAME_SIZE, GFP_KERNEL);
> +			dev_info(&port->dev, "adding fixed regulator %llu uv, %s for %s", *val,
> +				 regulator.supply, regulator.dev_name);
> +			regulator_register_always_on(0, dev->regulators[i].name, &regulator, 1,
> +						     *val);
> +		}

The registered regualtor is ignored here which means you leak the
regualtors every time a device is unregistered...

> +static void mikrobus_device_unregister(struct mikrobus_port *port, struct board_device_info *dev,
> +				       char *board_name)

..an operation which does seem to be supported?

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