Re: [PATCH v16 03/12] drm: imx: imx-hdmi: convert imx-hdmi to drm_bridge mode

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On 2014年12月04日 00:11, Russell King - ARM Linux wrote:
On Thu, Dec 04, 2014 at 12:04:37AM +0800, Andy Yan wrote:
Hi Russell:

On 2014年12月03日 23:38, Russell King - ARM Linux wrote:
On Wed, Dec 03, 2014 at 11:29:26PM +0800, Andy Yan wrote:
+int imx_hdmi_bind(struct device *dev, struct device *master,
+		  void *data, struct drm_encoder *encoder,
+		  const struct imx_hdmi_plat_data *plat_data)
  {
  	struct platform_device *pdev = to_platform_device(dev);
-	const struct of_device_id *of_id =
-				of_match_device(imx_hdmi_dt_ids, dev);
  	struct drm_device *drm = data;
  	struct device_node *np = dev->of_node;
  	struct device_node *ddc_node;
@@ -1594,19 +1566,16 @@ static int imx_hdmi_bind(struct device *dev, struct device *master, void *data)
  	struct resource *iores;
  	int ret, irq;
-	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
+	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
  	if (!hdmi)
  		return -ENOMEM;
-	hdmi->dev = dev;
+	hdmi->plat_data = plat_data;
+	hdmi->dev = &pdev->dev;
+	hdmi->dev_type = plat_data->dev_type;
  	hdmi->sample_rate = 48000;
  	hdmi->ratio = 100;
-
-	if (of_id) {
-		const struct platform_device_id *device_id = of_id->data;
-
-		hdmi->dev_type = device_id->driver_data;
-	}
+	hdmi->encoder = encoder;
I'd suggest changing imx_hdmi_bind() to take the struct resource and irq
number, and avoiding the platform device stuff altogether in here.

    Actually this is what the current code do: the resource and irq number
are all handled in imx_hdmi_bind
I meant that imx_hdmi_bind should be passed these, so that it needs to
know nothing about the struct device beyond the generic device structure.
In other words, the dw-hdmi core should not assume that the struct device
is part of a platform device.

if so, how about the device tree properties ddc-i2c-bus, reg-io-width, iahb, isfr,
  they are all found by device?

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