linux-kernel - Re: [PATCH v4 1/5] mfd: omap-usb-host: Update DT clock binding information

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Date:	Wed, 8 Jan 2014 10:08:08 +0100
From:	Sebastian Reichel <sre@...ian.org>
To:	Roger Quadros <rogerq@...com>
Cc:	bcousson@...libre.com, tony@...mide.com, balbi@...com,
	arnd@...db.de, linux-omap@...r.kernel.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v4 1/5] mfd: omap-usb-host: Update DT clock binding
 information

On Wed, Jan 08, 2014 at 11:45:38AM +0530, Roger Quadros wrote:
> diff --git a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> index b381fa6..5635202 100644
> --- a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> +++ b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> @@ -32,6 +32,10 @@ Optional properties:
>  - single-ulpi-bypass: Must be present if the controller contains a single
>    ULPI bypass control bit. e.g. OMAP3 silicon <= ES2.1
>  
> +- clocks: phandle to 60MHz functional clock to the USB Host module.
> +
> +- clock-names: must be "init_60m_fclk"
> +
>  Required properties if child node exists:
>  
>  - #address-cells: Must be 1

I have some questions:

What about the other clocks acquired in drivers/mfd/omap-usb-host.c? Shouldn't
all of those be provided by via the DT phandle?

Should the clk_get be changed to of_clk_get()/of_clk_get_by_name() in the
driver? This would potentially remove the need of the init_60m_fclk name.

$ grep clk_get drivers/mfd/omap-usb-host.c
    omap->ehci_logic_fck = clk_get(dev, "ehci_logic_fck");
    omap->utmi_p1_gfclk = clk_get(dev, "utmi_p1_gfclk");
    omap->utmi_p2_gfclk = clk_get(dev, "utmi_p2_gfclk");
    omap->xclk60mhsp1_ck = clk_get(dev, "xclk60mhsp1_ck");
    omap->xclk60mhsp2_ck = clk_get(dev, "xclk60mhsp2_ck");
    omap->init_60m_fclk = clk_get(dev, "init_60m_fclk");
    omap->utmi_clk[i] = clk_get(dev, clkname);
    omap->hsic480m_clk[i] = clk_get(dev, clkname);
    omap->hsic60m_clk[i] = clk_get(dev, clkname);

-- Sebastian

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