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Input: imx6ul_tsc - set glitch threshold by DTS property

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Set the glitch threshold by DTS property and keep the existing default
behavior if the 'debounce-delay-us' is not present.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250923143746.2857292-7-dario.binacchi@amarulasolutions.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dario Binacchi
2025-09-23 16:37:37 +02:00
committed by Dmitry Torokhov
parent 3fccd1f955
commit 5042e57d39
1 changed files with 23 additions and 2 deletions
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25
drivers/input/touchscreen/imx6ul_tsc.c
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@@ -79,7 +79,7 @@
#define MEASURE_SIG_EN BIT(0)
#define VALID_SIG_EN BIT(8)
#define DE_GLITCH_MASK GENMASK(30, 29)
#define DE_GLITCH_2 0x02
#define DE_GLITCH_DEF 0x02
#define START_SENSE BIT(12)
#define TSC_DISABLE BIT(16)
#define DETECT_MODE 0x2
@@ -98,6 +98,7 @@ struct imx6ul_tsc {
u32 pre_charge_time;
bool average_enable;
u32 average_select;
u32 de_glitch;
struct completion completion;
};
@@ -205,7 +206,7 @@ static void imx6ul_tsc_set(struct imx6ul_tsc *tsc)
basic_setting |= AUTO_MEASURE;
writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETTING);
debug_mode2 = FIELD_PREP(DE_GLITCH_MASK, DE_GLITCH_2);
debug_mode2 = FIELD_PREP(DE_GLITCH_MASK, tsc->de_glitch);
writel(debug_mode2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
writel(tsc->pre_charge_time, tsc->tsc_regs + REG_TSC_PRE_CHARGE_TIME);
@@ -391,6 +392,7 @@ static int imx6ul_tsc_probe(struct platform_device *pdev)
int tsc_irq;
int adc_irq;
u32 average_samples;
u32 de_glitch;
tsc = devm_kzalloc(&pdev->dev, sizeof(*tsc), GFP_KERNEL);
if (!tsc)
@@ -513,6 +515,25 @@ static int imx6ul_tsc_probe(struct platform_device *pdev)
return -EINVAL;
}
err = of_property_read_u32(np, "debounce-delay-us", &de_glitch);
if (err) {
tsc->de_glitch = DE_GLITCH_DEF;
} else {
u64 cycles;
unsigned long rate = clk_get_rate(tsc->tsc_clk);
cycles = DIV64_U64_ROUND_UP((u64)de_glitch * rate, USEC_PER_SEC);
if (cycles <= 0x3ff)
tsc->de_glitch = 3;
else if (cycles <= 0x7ff)
tsc->de_glitch = 2;
else if (cycles <= 0xfff)
tsc->de_glitch = 1;
else
tsc->de_glitch = 0;
}
err = input_register_device(tsc->input);
if (err) {
dev_err(&pdev->dev,