linux-kernel - Re: [PATCH v4 4/5] spi: bcm2835: new driver implementing auxiliar spi1/spi2 on the bcm2835 soc

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Message-ID: <55DD1CCF.4080808@wwwdotorg.org>
Date:	Tue, 25 Aug 2015 19:56:31 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	kernel@...tin.sperl.org
CC:	Lee Jones <lee@...nel.org>, Russell King <linux@....linux.org.uk>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v4 4/5] spi: bcm2835: new driver implementing auxiliar
 spi1/spi2 on the bcm2835 soc

On 08/24/2015 02:40 AM, kernel@...tin.sperl.org wrote:
> From: Martin Sperl <kernel@...tin.sperl.org>

Patch description?

>  arch/arm/configs/bcm2835_defconfig |    1 +
>  drivers/spi/Kconfig                |   12 +
>  drivers/spi/Makefile               |    1 +
>  drivers/spi/spi-bcm2835aux.c       |  506 ++++++++++++++++++++++++++++++++++++

A change to the defconfig would be applied by the RPi maintainers, and a
change to drivers/spi by the SPI maintainers. Those need to be in
different patches.

> diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c

> +static int bcm2835aux_spi_probe(struct platform_device *pdev)

> +	clk_prepare_enable(bs->clk);

Error checking?

> +	/* enable HW block */
> +	bcm2835aux_enable(&pdev->dev, ENABLE_PROPERTY);

The return value needs to be error-checked, so that deferred probe can
work, and so other kinds of errors can be detected. Wasn't this correct
in a previous patch version?

Note that I didn't review any code besides probe(), remove() and the
driver boiler-plate that refers to those functions.

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