linux-kernel - Re: [PATCH v2 1/2] clk: qcom: gcc-msm8960: add child devices support.

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Date:	Fri, 30 Jan 2015 14:00:25 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Eduardo Valentin <edubezval@...il.com>, nrajan@...eaurora.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 1/2] clk: qcom: gcc-msm8960: add child devices support.

On Fri, Jan 30, 2015 at 1:16 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 01/30/15 10:06, Srinivas Kandagatla wrote:
[..]
>> Stephen Any comments?
>
> I don't understand any of this. We should be making a specific tsens
> device directly in the gcc driver probe and not doing any sort of
> of_platform_populate(). This is what I had, but it probably could be
> done better so that we can assign the struct device's of_node pointer
> before registering on the platform bus.
>
>         platform_device_register_data(&pdev->dev, "tsens8960-tm", -1,
>                         &pdev->dev.of_node, sizeof(&pdev->dev.of_node));
>
> Then if we need to add any properties like #sensor-cells or coefficients
> the tsens driver can use the same of_node that gcc is using.
>

That makes sense and the dt will describe the hardware nicely, but how
do you get access to the register space from the tsens driver?

Will dev_get_regmap(pdev->dev.parent, NULL); find the mmio regmap of
gcc perhaps?

Regards,
Bjorn
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