linux-kernel - Re: [PATCH 2/2] PCI: imx6: limit DBI register length

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Date:   Tue, 20 Nov 2018 01:33:41 +0000
From:   Trent Piepho <tpiepho@...inj.com>
To:     "stefan@...er.ch" <stefan@...er.ch>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] PCI: imx6: limit DBI register length

On Mon, 2018-11-19 at 10:41 +0100, Stefan Agner wrote:
> 
>  
> +static const struct imx6_pcie_drvdata imx6q_pcie_drvdata = {
> +	.variant = IMX6Q,
> +	.dbi_length = 0x15c,
> +};
> +
> +static const struct imx6_pcie_drvdata imx6sx_pcie_drvdata = {
> +	.variant = IMX6SX,
> +};
> +
> +static const struct imx6_pcie_drvdata imx6qp_pcie_drvdata = {
> +	.variant = IMX6QP,
> +};
> +
> +static const struct imx6_pcie_drvdata imx7d_pcie_drvdata = {
> +	.variant = IMX7D,
> +};
> +
>  static const struct of_device_id imx6_pcie_of_match[] = {
> -	{ .compatible = "fsl,imx6q-pcie",  .data = (void *)IMX6Q,  },
> -	{ .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, },
> -	{ .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, },
> -	{ .compatible = "fsl,imx7d-pcie",  .data = (void *)IMX7D,  },
> +	{ .compatible = "fsl,imx6q-pcie",  .data = &imx6q_pcie_drvdata,  },
> +	{ .compatible = "fsl,imx6sx-pcie", .data = &imx6sx_pcie_drvdata, },
> +	{ .compatible = "fsl,imx6qp-pcie", .data = &imx6qp_pcie_drvdata, },
> +	{ .compatible = "fsl,imx7d-pcie",  .data = &imx7d_pcie_drvdata,  },
>  	{},
>  };

Instead of making a single drvdata struct for each type, this could use
an array:

static const struct imx6_pcie_drvdata drvdata[] = {
	[IMX6Q]  = { .variant = IMX6Q, .dbi_length = 0x15c },
	[IMX6SX] = { .variant = IMX6SX },
	[...]
};

static const struct of_device_id imx6_pcie_of_match[] = {
	{ .compatible = "fsl,imx6q-pcie",  .data = &drvdata[IMX6Q], },
	{ .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], },
	...
};