linux-kernel - Re: [PATCH V2] spi: tegra114: add spi driver

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Date:	Thu, 21 Feb 2013 12:15:15 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	broonie@...nsource.wolfsonmicro.com, linux-doc@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net,
	linux-tegra@...r.kernel.org, swarren@...dia.com
Subject: Re: [PATCH V2] spi: tegra114: add spi driver

On 02/21/2013 12:10 AM, Laxman Dewangan wrote:
> Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller
> is different than the older SoCs SPI controller in internal design as
> well as register interface.

Looks good. Just a couple of nits mentioned below, then,
Reviewed-by: Stephen Warren <swarren@...dia.com>

Note: There are a few minor diffs between this file and
spi-tegra20-slink.c. It might be worth eliminating as many as possible,
perhaps in a followon patch.

> diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt

> +NVIDIA Tegra114 SPI controller.
> +
> +Required properties:
> +- compatible : should be "nvidia,tegra114-spi".
> +- reg: Should contain SPI registers location and length.
> +- interrupts: Should contain SPI interrupts.
> +- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
> +  request selector for this SPI controller.

The binding should specify that a clock named "spi" needs to be
provided, using the standard properties in ../clock/clock-bindings.txt

> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile

>  obj-$(CONFIG_SPI_SIRF)		+= spi-sirf.o
>  obj-$(CONFIG_SPI_TEGRA20_SFLASH)	+= spi-tegra20-sflash.o
>  obj-$(CONFIG_SPI_TEGRA20_SLINK)		+= spi-tegra20-slink.o
> +obj-$(CONFIG_SPI_TEGRA114)		+= spi-tegra114.o

While Tegra114 is newer, it should really be listed before the Tegra20
entries, since the Makefile is alpha-numerically sorted right now I believe.

> diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c

> +static struct platform_driver tegra_spi_driver = {
> +	.driver = {
> +		.name		= "spi-tegra114",
> +		.owner		= THIS_MODULE,
> +		.pm		= &tegra_spi_pm_ops,
> +		.of_match_table	= of_match_ptr(tegra_spi_of_match),

No need to use of_match_ptr() there; just use the raw value since
CONFIG_OF is guaranteed to be enabled.
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