linux-kernel - Re: [RFC v2 5/8] ARM: tegra: Add auxiliary data for nvhost

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Message-ID: <50B45EA8.7000502@nvidia.com>
Date:	Tue, 27 Nov 2012 08:33:12 +0200
From:	Terje Bergström <tbergstrom@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: Re: [RFC v2 5/8] ARM: tegra: Add auxiliary data for nvhost

On 27.11.2012 01:39, Stephen Warren wrote:
> Clock names shouldn't be passed in platform data; instead, clk_get()
> should be passed the device object and device-relative (i.e. not global)
> clock name. I expect if the driver is fixed to make this change, the
> changes to tegra*_clocks_data.c won't be needed either.

Isn't this code doing exactly that - getting a device relative clock,
nvhost_module_init() in nvhost.acm.c:

(...)
	/* initialize clocks to known state */
	while (pdata->clocks[i].name && i < NVHOST_MODULE_MAX_CLOCKS) {
		long rate = pdata->clocks[i].default_rate;
		struct clk *c;

		c = devm_clk_get(&dev->dev, pdata->clocks[i].name);
		if (IS_ERR_OR_NULL(c)) {
			dev_err(&dev->dev, "Cannot get clock %s\n",
					pdata->clocks[i].name);
			return -ENODEV;
		}

		rate = clk_round_rate(c, rate);
		clk_prepare_enable(c);
		clk_set_rate(c, rate);
		clk_disable_unprepare(c);
		pdata->clk[i] = c;
		i++;
	}
(...)

Without the clock changes, the clocks in board files are now assigned to
devid "tegra_grhost". I guess the correct way to do this would be to
assign them to "tegra-gr2d" (2d, epp) and "host1x" - except if we also
want to drop "tegra-" from the device name.

Terje
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