linux-kernel - [PATCH v6 17/48] mfd: ti_am335x

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Date:   Fri, 15 Oct 2021 10:14:35 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, linux-iio@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Ryan Barnett <ryan.barnett@...lins.com>,
        linux-kernel@...r.kernel.org
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v6 17/48] mfd: ti_am335x_tscadc: Use driver data

So far every sub-cell parameter in this driver was hardcoded: cell name,
cell compatible, specific clock name and desired clock frequency.

As we are about to introduce support for ADC1/magnetic reader, we need a
bit of flexibility. Let's add a driver data structure which will contain
these information.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/mfd/ti_am335x_tscadc.c       | 22 ++++++++++++++++------
 include/linux/mfd/ti_am335x_tscadc.h |  9 +++++++++
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 2976028d2615..66dfd8790919 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -137,6 +137,8 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	tscadc->data = of_device_get_match_data(&pdev->dev);
+
 	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
 	of_property_read_u32(node, "ti,wires", &tsc_wires);
 	of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
@@ -212,7 +214,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 		goto err_disable_clk;
 	}
 
-	tscadc->clk_div = (clk_get_rate(clk) / ADC_CLK) - 1;
+	tscadc->clk_div = (clk_get_rate(clk) / tscadc->data->target_clk_rate) - 1;
 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
 
 	/* Set the control register bits */
@@ -241,8 +243,8 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	if (tsc_wires > 0) {
 		tscadc->tsc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
-		cell->name = "TI-am335x-tsc";
-		cell->of_compatible = "ti,am3359-tsc";
+		cell->name = tscadc->data->secondary_feature_name;
+		cell->of_compatible = tscadc->data->secondary_feature_compatible;
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
 	}
@@ -251,8 +253,8 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	if (adc_channels > 0) {
 		tscadc->adc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
-		cell->name = "TI-am335x-adc";
-		cell->of_compatible = "ti,am3359-adc";
+		cell->name = tscadc->data->adc_feature_name;
+		cell->of_compatible = tscadc->data->adc_feature_compatible;
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
 	}
@@ -338,8 +340,16 @@ static int __maybe_unused tscadc_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume);
 
+static const struct ti_tscadc_data tscdata = {
+	.adc_feature_name = "TI-am335x-adc",
+	.adc_feature_compatible = "ti,am3359-adc",
+	.secondary_feature_name = "TI-am335x-tsc",
+	.secondary_feature_compatible = "ti,am3359-tsc",
+	.target_clk_rate = ADC_CLK,
+};
+
 static const struct of_device_id ti_tscadc_dt_ids[] = {
-	{ .compatible = "ti,am3359-tscadc", },
+	{ .compatible = "ti,am3359-tscadc", .data = &tscdata },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index ffc091b77633..bb3b56ade3fb 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -162,11 +162,20 @@
 
 #define TSCADC_CELLS		2
 
+struct ti_tscadc_data {
+	char *adc_feature_name;
+	char *adc_feature_compatible;
+	char *secondary_feature_name;
+	char *secondary_feature_compatible;
+	unsigned int target_clk_rate;
+};
+
 struct ti_tscadc_dev {
 	struct device *dev;
 	struct regmap *regmap;
 	void __iomem *tscadc_base;
 	phys_addr_t tscadc_phys_base;
+	const struct ti_tscadc_data *data;
 	int irq;
 	int used_cells;	/* 1-2 */
 	int tsc_wires;
-- 
2.27.0