drm: bridge: dw-hdmi: Move IRQ and IO resource allocation to common code

There's no need to duplicate identical code in multiple drivers (two at
the moment, one more to come soon). Move it to the dw-hdmi core where it
can be shared. If resource allocation ever becomes device-specific later
we'll always have the option of splitting it out again.

While it at pass the platform device to the bind function to avoid
having to cast struct device to struct platform_device.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170117082910.27023-8-laurent.pinchart+renesas@ideasonboard.com

drivers/gpu/drm/bridge/dw-hdmi.c

@@ -1843,14 +1843,16 @@ static int dw_hdmi_register(struct drm_encoder *encoder, struct dw_hdmi *hdmi)
 	return 0;
 }
 
-int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
-		 struct resource *iores, int irq,
+int dw_hdmi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
 		 const struct dw_hdmi_plat_data *plat_data)
 {
+	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct platform_device_info pdevinfo;
 	struct device_node *ddc_node;
 	struct dw_hdmi *hdmi;
+	struct resource *iores;
+	int irq;
 	int ret;
 	u32 val = 1;
 	u8 config0;
@@ -1903,6 +1905,7 @@ int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
 		dev_dbg(hdmi->dev, "no ddc property found\n");
 	}
 
+	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	hdmi->regs = devm_ioremap_resource(dev, iores);
 	if (IS_ERR(hdmi->regs)) {
 		ret = PTR_ERR(hdmi->regs);
@@ -1945,6 +1948,10 @@ int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
 
 	initialize_hdmi_ih_mutes(hdmi);
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		goto err_iahb;
+
 	ret = devm_request_threaded_irq(dev, irq, dw_hdmi_hardirq,
 					dw_hdmi_irq, IRQF_SHARED,
 					dev_name(dev), hdmi);
@@ -2025,7 +2032,7 @@ int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
 	if (hdmi->i2c)
 		dw_hdmi_i2c_init(hdmi);
 
-	dev_set_drvdata(dev, hdmi);
+	platform_set_drvdata(pdev, hdmi);
 
 	return 0;
 

drivers/gpu/drm/imx/dw_hdmi-imx.c

@@ -207,8 +207,6 @@ static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 	struct drm_device *drm = data;
 	struct drm_encoder *encoder;
 	struct imx_hdmi *hdmi;
-	struct resource *iores;
-	int irq;
 	int ret;
 
 	if (!pdev->dev.of_node)
@@ -223,14 +221,6 @@ static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 	hdmi->dev = &pdev->dev;
 	encoder = &hdmi->encoder;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
-
-	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!iores)
-		return -ENXIO;
-
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 	/*
 	 * If we failed to find the CRTC(s) which this encoder is
@@ -249,7 +239,7 @@ static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 	drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
 			 DRM_MODE_ENCODER_TMDS, NULL);
 
-	ret = dw_hdmi_bind(dev, encoder, iores, irq, plat_data);
+	ret = dw_hdmi_bind(pdev, encoder, plat_data);
 
 	/*
 	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),

drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -257,8 +257,6 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 	struct drm_device *drm = data;
 	struct drm_encoder *encoder;
 	struct rockchip_hdmi *hdmi;
-	struct resource *iores;
-	int irq;
 	int ret;
 
 	if (!pdev->dev.of_node)
@@ -273,14 +271,6 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 	hdmi->dev = &pdev->dev;
 	encoder = &hdmi->encoder;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
-
-	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!iores)
-		return -ENXIO;
-
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 	/*
 	 * If we failed to find the CRTC(s) which this encoder is
@@ -301,7 +291,7 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 	drm_encoder_init(drm, encoder, &dw_hdmi_rockchip_encoder_funcs,
 			 DRM_MODE_ENCODER_TMDS, NULL);
 
-	ret = dw_hdmi_bind(dev, encoder, iores, irq, plat_data);
+	ret = dw_hdmi_bind(pdev, encoder, plat_data);
 
 	/*
 	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),

include/drm/bridge/dw_hdmi.h

@@ -57,8 +57,7 @@ struct dw_hdmi_plat_data {
 };
 
 void dw_hdmi_unbind(struct device *dev);
-int dw_hdmi_bind(struct device *dev, struct drm_encoder *encoder,
-		 struct resource *iores, int irq,
+int dw_hdmi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
 		 const struct dw_hdmi_plat_data *plat_data);
 
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);