From 0a1233031c16d8575be6b864e6fd353b6fd758c4 Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Fri, 15 Oct 2021 10:14:54 +0200 Subject: mfd: ti_am335x_tscadc: Add ADC1/magnetic reader support Introduce a new compatible that has another set of driver data, targeting am437x SoCs with a magnetic reader instead of the touchscreen and a more featureful set of registers. Signed-off-by: Miquel Raynal Reviewed-by: Jonathan Cameron Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20211015081506.933180-37-miquel.raynal@bootlin.com --- drivers/mfd/ti_am335x_tscadc.c | 37 ++++++++++++++++++++++++++++++------- 1 file changed, 30 insertions(+), 7 deletions(-) (limited to 'drivers/mfd') diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index 4f76b5498077..bfbc8288a71e 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -121,11 +121,11 @@ static int ti_tscadc_probe(struct platform_device *pdev) struct mfd_cell *cell; struct property *prop; const __be32 *cur; - bool use_tsc = false; + bool use_tsc = false, use_mag = false; u32 val; int err; int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels; - int readouts = 0; + int readouts = 0, mag_tracks = 0; /* Allocate memory for device */ tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL); @@ -148,6 +148,16 @@ static int ti_tscadc_probe(struct platform_device *pdev) of_node_put(node); if (tscmag_wires) use_tsc = true; + } else { + /* + * When adding support for the magnetic stripe reader, here is + * the place to look for the number of tracks used from device + * tree. Let's default to 0 for now. + */ + mag_tracks = 0; + tscmag_wires = mag_tracks * 2; + if (tscmag_wires) + use_mag = true; } node = of_get_child_by_name(pdev->dev.of_node, "adc"); @@ -209,8 +219,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) * The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK. * ADCs produce a 12-bit sample every 15 ADC_CLK cycles. * am33xx ADCs expect to capture 200ksps. - * We need the ADC clocks to run at 3MHz. - * This frequency is valid since TSC_ADC_SS controller design + * am47xx ADCs expect to capture 867ksps. + * We need ADC clocks respectively running at 3MHz and 13MHz. + * These frequencies are valid since TSC_ADC_SS controller design * assumes the OCP clock is at least 6x faster than the ADC clock. */ clk = devm_clk_get(&pdev->dev, NULL); @@ -238,6 +249,9 @@ static int ti_tscadc_probe(struct platform_device *pdev) else tscadc->ctrl |= CNTRLREG_TSC_4WIRE; } + } else { + tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN | + CNTRLREG_MAG_PREAMP_BYPASS; } regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); @@ -246,8 +260,8 @@ static int ti_tscadc_probe(struct platform_device *pdev) /* Enable the TSC module enable bit */ regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB); - /* TSC Cell */ - if (tscmag_wires > 0) { + /* TSC or MAG Cell */ + if (use_tsc || use_mag) { cell = &tscadc->cells[cell_idx++]; cell->name = tscadc->data->secondary_feature_name; cell->of_compatible = tscadc->data->secondary_feature_compatible; @@ -340,8 +354,17 @@ static const struct ti_tscadc_data tscdata = { .target_clk_rate = TSC_ADC_CLK, }; +static const struct ti_tscadc_data magdata = { + .adc_feature_name = "TI-am43xx-adc", + .adc_feature_compatible = "ti,am4372-adc", + .secondary_feature_name = "TI-am43xx-mag", + .secondary_feature_compatible = "ti,am4372-mag", + .target_clk_rate = MAG_ADC_CLK, +}; + static const struct of_device_id ti_tscadc_dt_ids[] = { { .compatible = "ti,am3359-tscadc", .data = &tscdata }, + { .compatible = "ti,am4372-magadc", .data = &magdata }, { } }; MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids); @@ -359,6 +382,6 @@ static struct platform_driver ti_tscadc_driver = { module_platform_driver(ti_tscadc_driver); -MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); +MODULE_DESCRIPTION("TI touchscreen/magnetic stripe reader/ADC MFD controller driver"); MODULE_AUTHOR("Rachna Patil "); MODULE_LICENSE("GPL"); -- cgit v1.2.3-59-g8ed1b