diff mbox series

[26/40] mfd: ti_am335x_tscadc: Introduce has_tsc

Message ID 20210825152518.379386-27-miquel.raynal@bootlin.com (mailing list archive)
State New, archived
Headers show
Series TI AM437X ADC1 | expand

Commit Message

Miquel Raynal Aug. 25, 2021, 3:25 p.m. UTC 
One way of knowing which hardware we are dealing with is to check its
compatible. When this must be done at several places, it's best to use a
proper boolean for that. ->has_tsc indicates if there is a touchscreen
controller available (meaning it's a am33xx-like ADC) or not but does
not indicate if it is actually used (that is the purpose of the use_tsc
boolean in the probe).

Introducing this boolean 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 <miquel.raynal@bootlin.com>
---
 drivers/mfd/ti_am335x_tscadc.c       | 37 +++++++++++++++++-----------
 include/linux/mfd/ti_am335x_tscadc.h |  1 +
 2 files changed, 23 insertions(+), 15 deletions(-)

Comments

Jonathan Cameron Aug. 30, 2021, 2:02 p.m. UTC | #1 
On Wed, 25 Aug 2021 17:25:04 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> One way of knowing which hardware we are dealing with is to check its
> compatible. When this must be done at several places, it's best to use a
> proper boolean for that. ->has_tsc indicates if there is a touchscreen
> controller available (meaning it's a am33xx-like ADC) or not but does
> not indicate if it is actually used (that is the purpose of the use_tsc
> boolean in the probe).
> 
> Introducing this boolean 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 <miquel.raynal@bootlin.com>
Seems sensible to me.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/mfd/ti_am335x_tscadc.c       | 37 +++++++++++++++++-----------
>  include/linux/mfd/ti_am335x_tscadc.h |  1 +
>  2 files changed, 23 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index 30f53cdb41f8..a40091830cea 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 (tscadc->data->has_tsc)
> +		idleconfig |= STEPCONFIG_YNN | STEPCONFIG_YPN;
>  
>  	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
>  }
> @@ -139,11 +140,13 @@ 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);
> -	if (tscmag_wires)
> -		use_tsc = true;
> +	if (tscadc->data->has_tsc) {
> +		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);
> +		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) {
> @@ -218,15 +221,18 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
>  	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
>  
>  	/* Set the control register bits */
> -	tscadc->ctrl = CNTRLREG_TSC_STEPCONFIGWRT | CNTRLREG_STEPID;
> -	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
> +	tscadc->ctrl = CNTRLREG_STEPID;
> +	if (tscadc->data->has_tsc) {
> +		tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT;
> +		regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
> +		if (use_tsc) {
> +			tscadc->ctrl |= CNTRLREG_TSC_ENB;
> +			if (tscmag_wires == 5)
> +				tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
> +			else
> +				tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
> +		}
>  
> -	if (use_tsc) {
> -		tscadc->ctrl |= CNTRLREG_TSC_ENB;
> -		if (tscmag_wires == 5)
> -			tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
> -		else
> -			tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
>  	}
>  
>  	tscadc_idle_config(tscadc);
> @@ -321,6 +327,7 @@ 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 = {
> +	.has_tsc = true,
>  	.name_tscmag = "TI-am335x-tsc",
>  	.compat_tscmag = "ti,am3359-tsc",
>  	.name_adc = "TI-am335x-adc",
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index d5e2ff8dc84a..082b2af94263 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -163,6 +163,7 @@
>  #define TSCADC_CELLS		2
>  
>  struct ti_tscadc_data {
> +	bool has_tsc;
>  	char *name_tscmag;
>  	char *compat_tscmag;
>  	char *name_adc;
diff mbox series

Patch

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 30f53cdb41f8..a40091830cea 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 (tscadc->data->has_tsc)
+		idleconfig |= STEPCONFIG_YNN | STEPCONFIG_YPN;
 
 	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
 }
@@ -139,11 +140,13 @@  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);
-	if (tscmag_wires)
-		use_tsc = true;
+	if (tscadc->data->has_tsc) {
+		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);
+		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) {
@@ -218,15 +221,18 @@  static	int ti_tscadc_probe(struct platform_device *pdev)
 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
 
 	/* Set the control register bits */
-	tscadc->ctrl = CNTRLREG_TSC_STEPCONFIGWRT | CNTRLREG_STEPID;
-	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
+	tscadc->ctrl = CNTRLREG_STEPID;
+	if (tscadc->data->has_tsc) {
+		tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT;
+		regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
+		if (use_tsc) {
+			tscadc->ctrl |= CNTRLREG_TSC_ENB;
+			if (tscmag_wires == 5)
+				tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
+			else
+				tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
+		}
 
-	if (use_tsc) {
-		tscadc->ctrl |= CNTRLREG_TSC_ENB;
-		if (tscmag_wires == 5)
-			tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
-		else
-			tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
 	}
 
 	tscadc_idle_config(tscadc);
@@ -321,6 +327,7 @@  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 = {
+	.has_tsc = true,
 	.name_tscmag = "TI-am335x-tsc",
 	.compat_tscmag = "ti,am3359-tsc",
 	.name_adc = "TI-am335x-adc",
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index d5e2ff8dc84a..082b2af94263 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -163,6 +163,7 @@ 
 #define TSCADC_CELLS		2
 
 struct ti_tscadc_data {
+	bool has_tsc;
 	char *name_tscmag;
 	char *compat_tscmag;
 	char *name_adc;