mfd: stmpe: Probe sub-function by compatible

Use sub-function of_compatible during probe, instead of using the node
name. The code should not rely on the node names during probe, in
addition to that the previously hard-coded node names are not compliant
to the latest naming convention (they are not generic and they use
underscores), and it was broken by mistake already once [1].

[1] commit 56086b5e ("ARM: dts: imx6qdl-apalis: Avoid underscore in node name")
Suggested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220712163345.445811-3-francesco.dolcini@toradex.com

drivers/mfd/stmpe.c

@@ -1362,17 +1362,16 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
 	pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
 
 	for_each_available_child_of_node(np, child) {
-		if (of_node_name_eq(child, "stmpe_gpio")) {
+		if (of_device_is_compatible(child, stmpe_gpio_cell.of_compatible))
 			pdata->blocks |= STMPE_BLOCK_GPIO;
-		} else if (of_node_name_eq(child, "stmpe_keypad")) {
+		else if (of_device_is_compatible(child, stmpe_keypad_cell.of_compatible))
 			pdata->blocks |= STMPE_BLOCK_KEYPAD;
-		} else if (of_node_name_eq(child, "stmpe_touchscreen")) {
+		else if (of_device_is_compatible(child, stmpe_ts_cell.of_compatible))
 			pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
-		} else if (of_node_name_eq(child, "stmpe_adc")) {
+		else if (of_device_is_compatible(child, stmpe_adc_cell.of_compatible))
 			pdata->blocks |= STMPE_BLOCK_ADC;
-		} else if (of_node_name_eq(child, "stmpe_pwm")) {
+		else if (of_device_is_compatible(child, stmpe_pwm_cell.of_compatible))
 			pdata->blocks |= STMPE_BLOCK_PWM;
-		}
 	}
 }