linux-kernel - Re: [PATCH v16 03/12] drm: imx: imx-hdmi: convert imx-hdmi to drm

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Date:	Wed, 3 Dec 2014 16:11:22 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Andy Yan <andy.yan@...k-chips.com>
Cc:	airlied@...ux.ie, Philipp Zabel <p.zabel@...gutronix.de>,
	heiko@...ech.de, fabio.estevam@...escale.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Sean Paul <seanpaul@...omium.org>,
	Inki Dae <inki.dae@...sung.com>,
	Dave Airlie <airlied@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	Zubair.Kakakhel@...tec.com, djkurtz@...gle.com, ykk@...k-chips.com,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, jay.xu@...k-chips.com,
	Pawel Moll <pawel.moll@....com>, mark.yao@...k-chips.com,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	vladimir_zapolskiy@...tor.com, Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v16 03/12] drm: imx: imx-hdmi: convert imx-hdmi to
 drm_bridge mode

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.

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