Re: [PATCH 4/6] v4l: vsp1: Add DT support

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hello,

Gentle ping. I'll send a pull request in a week if I don't receive any comment 
on the DT bindings in the meantime.

On Wednesday 05 March 2014 20:30:27 Laurent Pinchart wrote:
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>  .../devicetree/bindings/media/renesas,vsp1.txt     | 51 +++++++++++++++++++
>  drivers/media/platform/vsp1/vsp1_drv.c             | 52 +++++++++++++++----
>  2 files changed, 95 insertions(+), 8 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/media/renesas,vsp1.txt
> 
> (With the DT mailing list CC'ed this time, sorry about that)
> 
> diff --git a/Documentation/devicetree/bindings/media/renesas,vsp1.txt
> b/Documentation/devicetree/bindings/media/renesas,vsp1.txt new file mode
> 100644
> index 0000000..3b828d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/renesas,vsp1.txt
> @@ -0,0 +1,51 @@
> +* Renesas VSP1 Video Processing Engine
> +
> +The VSP1 is a video processing engine that supports up-/down-scaling, alpha
> +blending, color space conversion and various other image processing
> features.
> +It can be found in the Renesas R-Car second generation SoCs.
> +
> +Required properties:
> +
> +  - compatible: Must contain "renesas,vsp1"
> +
> +  - reg: Base address and length of the registers block for the VSP1.
> +  - interrupt-parent, interrupts: Specifier for the VSP1 interrupt.
> +
> +  - clocks: A list of phandle + clock-specifier pairs for the main VSP1
> clock
> +    and the optional auxiliary RT clock if needed. VSP1 instances that need
> an
> +    auxiliary RT clock must specify the clock-names property.
> +
> +  - renesas,#rpf: Number of Read Pixel Formatter (RPF) modules in the VSP1.
> +  - renesas,#uds: Number of Up Down Scaler (UDS) modules in the VSP1.
> +  - renesas,#wpf: Number of Write Pixel Formatter (WPF) modules in the
> VSP1.
> +
> +
> +Optional properties:
> +
> +  - clock-names: When the VSP1 requires an auxiliary RT clock this property
> +    must be present and must contain "", "rt".
> +
> +  - renesas,has-lif: Boolean, indicates that the LCD Interface (LIF) module
> is
> +    available.
> +  - renesas,has-lut: Boolean, indicates that the Look Up Table (LUT) module
> is
> +    available.
> +  - renesas,has-sru: Boolean, indicates that the Super Resolution Unit
> (SRU)
> +    module is available.
> +
> +
> +Example: R8A7790 (R-Car H2) VSP1-S node
> +
> +	vsp1@fe928000 {
> +		compatible = "renesas,vsp1";
> +		reg = <0 0xfe928000 0 0x8000>;
> +		interrupts = <0 267 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&mstp1_clks R8A7790_CLK_VSP1_SY>,
> +			 <&mstp1_clks R8A7790_CLK_VSP1_RT>;
> +		clock-names = "", "rt";
> +
> +		renesas,has-lut;
> +		renesas,has-sru;
> +		renesas,#rpf = <5>;
> +		renesas,#uds = <3>;
> +		renesas,#wpf = <4>;
> +	};
> diff --git a/drivers/media/platform/vsp1/vsp1_drv.c
> b/drivers/media/platform/vsp1/vsp1_drv.c index 5f774cc..b75ca84 100644
> --- a/drivers/media/platform/vsp1/vsp1_drv.c
> +++ b/drivers/media/platform/vsp1/vsp1_drv.c
> @@ -16,6 +16,7 @@
>  #include <linux/device.h>
>  #include <linux/interrupt.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/videodev2.h>
> 
> @@ -458,34 +459,59 @@ static const struct dev_pm_ops vsp1_pm_ops = {
>   * Platform Driver
>   */
> 
> -static struct vsp1_platform_data *
> -vsp1_get_platform_data(struct platform_device *pdev)
> +static int vsp1_validate_platform_data(struct platform_device *pdev,
> +				       struct vsp1_platform_data *pdata)
>  {
> -	struct vsp1_platform_data *pdata = pdev->dev.platform_data;
> -
>  	if (pdata == NULL) {
>  		dev_err(&pdev->dev, "missing platform data\n");
> -		return NULL;
> +		return -EINVAL;
>  	}
> 
>  	if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
>  		dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
>  			pdata->rpf_count);
> -		return NULL;
> +		return -EINVAL;
>  	}
> 
>  	if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
>  		dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
>  			pdata->uds_count);
> -		return NULL;
> +		return -EINVAL;
>  	}
> 
>  	if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
>  		dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
>  			pdata->wpf_count);
> -		return NULL;
> +		return -EINVAL;
>  	}
> 
> +	return 0;
> +}
> +
> +static struct vsp1_platform_data *
> +vsp1_get_platform_data(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct vsp1_platform_data *pdata;
> +
> +	if (!IS_ENABLED(CONFIG_OF) || np == NULL)
> +		return pdev->dev.platform_data;
> +
> +	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> +	if (pdata == NULL)
> +		return NULL;
> +
> +	if (of_property_read_bool(np, "renesas,has-lif"))
> +		pdata->features |= VSP1_HAS_LIF;
> +	if (of_property_read_bool(np, "renesas,has-lut"))
> +		pdata->features |= VSP1_HAS_LUT;
> +	if (of_property_read_bool(np, "renesas,has-sru"))
> +		pdata->features |= VSP1_HAS_SRU;
> +
> +	of_property_read_u32(np, "renesas,#rpf", &pdata->rpf_count);
> +	of_property_read_u32(np, "renesas,#uds", &pdata->uds_count);
> +	of_property_read_u32(np, "renesas,#wpf", &pdata->wpf_count);
> +
>  	return pdata;
>  }
> 
> @@ -508,6 +534,10 @@ static int vsp1_probe(struct platform_device *pdev)
>  	if (vsp1->pdata == NULL)
>  		return -ENODEV;
> 
> +	ret = vsp1_validate_platform_data(pdev, vsp1->pdata);
> +	if (ret < 0)
> +		return ret;
> +
>  	/* I/O, IRQ and clock resources */
>  	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
> @@ -557,6 +587,11 @@ static int vsp1_remove(struct platform_device *pdev)
>  	return 0;
>  }
> 
> +static const struct of_device_id vsp1_of_match[] = {
> +	{ .compatible = "renesas,vsp1" },
> +	{ },
> +};
> +
>  static struct platform_driver vsp1_platform_driver = {
>  	.probe		= vsp1_probe,
>  	.remove		= vsp1_remove,
> @@ -564,6 +599,7 @@ static struct platform_driver vsp1_platform_driver = {
>  		.owner	= THIS_MODULE,
>  		.name	= "vsp1",
>  		.pm	= &vsp1_pm_ops,
> +		.of_match_table = of_match_ptr(vsp1_of_match),
>  	},
>  };

-- 
Regards,

Laurent Pinchart