From bf0f394c7b1e4d623ca2afdf59b3b4b95cc6f592 Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Fri, 15 Oct 2021 10:14:53 +0200 Subject: mfd: ti_am335x_tscadc: Introduce a helper to deal with the type of hardware One way of knowing which hardware we are dealing with is to check the compatible string. When this must be done at several places, it's best and certainly more clear to use a helper for that. Introduce ti_adc_with_touchscreen() to indicate if there is a touchscreen controller available (meaning it's an am33xx-like ADC). This helper does not indicate if it is actually used (that is the purpose of the use_tsc boolean). Introducing this helper helps making a difference in the code between what is generic to both types of ADCs and what is specific to the am33xx hardware before introducing support for the am437x hardware. Signed-off-by: Miquel Raynal Reviewed-by: Jonathan Cameron Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20211015081506.933180-36-miquel.raynal@bootlin.com --- drivers/mfd/ti_am335x_tscadc.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-) (limited to 'drivers/mfd') diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index f7cfe2016bbc..4f76b5498077 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -105,8 +105,9 @@ static void tscadc_idle_config(struct ti_tscadc_dev *tscadc) { unsigned int idleconfig; - idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM | - STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN; + idleconfig = STEPCONFIG_INM_ADCREFM | STEPCONFIG_INP_ADCREFM; + if (ti_adc_with_touchscreen(tscadc)) + idleconfig |= STEPCONFIG_YNN | STEPCONFIG_YPN; regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig); } @@ -140,12 +141,14 @@ static int ti_tscadc_probe(struct platform_device *pdev) 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", &tscmag_wires); - of_property_read_u32(node, "ti,coordiante-readouts", &readouts); - of_node_put(node); - if (tscmag_wires) - use_tsc = true; + if (ti_adc_with_touchscreen(tscadc)) { + node = of_get_child_by_name(pdev->dev.of_node, "tsc"); + of_property_read_u32(node, "ti,wires", &tscmag_wires); + of_property_read_u32(node, "ti,coordiante-readouts", &readouts); + of_node_put(node); + if (tscmag_wires) + use_tsc = true; + } node = of_get_child_by_name(pdev->dev.of_node, "adc"); of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) { @@ -225,13 +228,16 @@ static int ti_tscadc_probe(struct platform_device *pdev) * of the CTRL register but not the subsystem enable bit which must be * added manually when timely. */ - tscadc->ctrl = CNTRLREG_TSC_STEPCONFIGWRT | CNTRLREG_STEPID; - if (use_tsc) { - tscadc->ctrl |= CNTRLREG_TSC_ENB; - if (tscmag_wires == 5) - tscadc->ctrl |= CNTRLREG_TSC_5WIRE; - else - tscadc->ctrl |= CNTRLREG_TSC_4WIRE; + tscadc->ctrl = CNTRLREG_STEPID; + if (ti_adc_with_touchscreen(tscadc)) { + tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT; + if (use_tsc) { + tscadc->ctrl |= CNTRLREG_TSC_ENB; + if (tscmag_wires == 5) + tscadc->ctrl |= CNTRLREG_TSC_5WIRE; + else + tscadc->ctrl |= CNTRLREG_TSC_4WIRE; + } } regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl); -- cgit