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 23:40:00 +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 12:56:24AM +0800, Andy Yan wrote:
> Hi Russell:
> On 2014年12月04日 00:33, Russell King - ARM Linux wrote:
> >On Thu, Dec 04, 2014 at 12:30:23AM +0800, Andy Yan wrote:
> >>On 2014年12月04日 00:11, Russell King - ARM Linux wrote:
> >>>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?
> >If the device has a device tree node associated with it, it will have a
> >non-NULL dev->of_node - which is part of the generic device structure.
> >
>   so , I just need get the resource and irq number in the
> dw_hdmi-imx/rockchip ,than
>   pass them to imx_hdmi_bind, as the properties ddc-i2c-bus, reg-io-width,
> iahb,isfr, they
>   are still can be handled in imx_hdmi_bind ?

Basically, what I'm suggesting is just this change to imx_hdmi_bind():

 int imx_hdmi_bind(struct device *dev, struct device *master,
		  void *data, struct drm_encoder *encoder,
+		  const struct resource *iores, int irq,
		  const struct imx_hdmi_plat_data *plat_data)
 {
-	struct platform_device *pdev = to_platform_device(dev);
...
	}

-	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;
...
		return ret;

-	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hdmi->regs = devm_ioremap_resource(dev, iores);
	if (IS_ERR(hdmi->regs))

and supplying those as arguments from the caller.

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