linux-kernel - Re: [PATCH] regulator: core: add regulator_get_linear

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Date:	Fri, 7 Jun 2013 10:11:51 +0000 (UTC)
From:	Paul Walmsley <pwalmsley@...dia.com>
To:	Mark Brown <broonie@...nel.org>
cc:	Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, Andrew Chew <achew@...dia.com>,
	Matthew Longnecker <mlongnecker@...dia.com>
Subject: Re: [PATCH] regulator: core: add regulator_get_linear_step()

On Fri, 7 Jun 2013, Paul Walmsley wrote:

> The IP block has an I2C controller embedded in it that autonomously sends 
> set-voltage commands (across a range of voltages) to the PMIC.  To enable 
> that, the driver must first initialize the IP block with a 
> voltage-to-selector table.

Here's the table loading code -

+/**
+ * _load_lut - load voltage lookup table into DFLL RAM
+ * @pdev: DFLL instance
+ *
+ * Load the voltage-to-PMIC register value lookup table into the DFLL
+ * IP block LUT memory.  td->lut_min and td->lut_max are used to cap
+ * the minimum and maximum voltage requested.  This function shouldn't
+ * be called directly by code other than dfll_load_lut(), since this
+ * function doesn't handle the necessary pre- and post-requisites.  No
+ * return value.
+ */
+static void _load_lut(struct platform_device *pdev)
+{
+	struct tegra_dfll *td = dev_get_drvdata(&pdev->dev);
+	int i;
+	u32 val;
+
+	val = td->out_map[td->lut_min]->reg_value;
+	for (i = 0; i <= td->lut_min; i++)
+		dfll_writel(td, val, DFLL_OUTPUT_LUT + i * 4);
+
+	for (; i < td->lut_max; i++) {
+		val = td->out_map[i]->reg_value;
+		dfll_writel(td, val, DFLL_OUTPUT_LUT + i * 4);
+	}
+
+	val = td->out_map[td->lut_max]->reg_value;
+	for (; i < td->num_voltages; i++)
+		dfll_writel(td, val, DFLL_OUTPUT_LUT + i * 4);
+
+	dfll_wmb(td);
+}



- Paul
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