linux-kernel - Re: [RFC PATCHv3 2/7] OMAP SSI: Introducing OMAP SSI driver

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Date:	Tue, 12 Oct 2010 13:49:27 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Carlos Chinea <carlos.chinea@...ia.com>
Cc:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [RFC PATCHv3 2/7] OMAP SSI: Introducing OMAP SSI driver

* Carlos Chinea <carlos.chinea@...ia.com> [101011 01:58]:
> Introduces the OMAP SSI driver in the kernel.
> 
> The Synchronous Serial Interface (SSI) is a legacy version
> of HSI. As in the case of HSI, it is mainly used to connect
> Application engines (APE) with cellular modem engines (CMT)
> in cellular handsets.
> 
> It provides a multichannel, full-duplex, multi-core communication
> with no reference clock. The OMAP SSI block is capable of reaching
> speeds of 110 Mbit/s.
> 
> Signed-off-by: Carlos Chinea <carlos.chinea@...ia.com>

> --- /dev/null
> +++ b/arch/arm/mach-omap2/ssi.c

> +static struct resource ssi_resources[] = {
> +	/* SSI controller */
> +	[0] = {
> +		.start	= 0x48058000,
> +		.end	= 0x48058fff,
> +		.name	= "omap_ssi_sys",
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	/* GDD */
> +	[1] = {
> +		.start	= 0x48059000,
> +		.end	= 0x48059fff,
> +		.name	= "omap_ssi_gdd",
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[2] = {
> +		.start	= 71,
> +		.end	= 71,
> +		.name	= "ssi_gdd",
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +	/* SSI port 1 */
> +	[3] = {
> +		.start	= 0x4805a000,
> +		.end	= 0x4805a7ff,
> +		.name	= "omap_ssi_sst1",
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[4] = {
> +		.start	= 0x4805a800,
> +		.end	= 0x4805afff,
> +		.name	= "omap_ssi_ssr1",
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[5] = {
> +		.start	= 67,
> +		.end	= 67,
> +		.name	= "ssi_p1_mpu_irq0",
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +	[6] = {
> +		.start	= 69,
> +		.end	= 69,
> +		.name	= "ssi_p1_mpu_irq1",
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +	[7] = {
> +		.start	= 0,
> +		.end	= 0,
> +		.name	= "ssi_p1_cawake",
> +		.flags	= IORESOURCE_IRQ | IORESOURCE_UNSET,
> +	},
> +};

Are these resources the same for omap2, 3 & 4?

> +static void ssi_pdev_release(struct device *dev)
> +{
> +}

Not needed.

> +static struct platform_device ssi_pdev = {
> +	.name		= "omap_ssi",
> +	.id		= 0,
> +	.num_resources	= ARRAY_SIZE(ssi_resources),
> +	.resource	= ssi_resources,
> +	.dev		= {
> +				.release	= ssi_pdev_release,
> +				.platform_data	= &ssi_pdata,
> +	},
> +};

Dummy release not needed here either.

> +static int __init ssi_init(void)
> +{
> +	return platform_device_register(&ssi_pdev);
> +}
> +subsys_initcall(ssi_init);

This will probably cause trouble on omap2 and 4?

To me it seems that you should at least return early on the unsupported
platforms.

You might want to consider updating this for omap hwmod as it will
automate the platform_device and PM related issues to some extent.

Regards,

Tony
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