linux-kernel - [PATCH v2 2/5] mfd: stmpe: Probe sub-function by compatible

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Date:   Tue, 12 Jul 2022 18:33:42 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: [PATCH v2 2/5] 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 56086b5e804f ("ARM: dts: imx6qdl-apalis: Avoid underscore in node name")

Suggested-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
v2:
 - remove define usage for compatible strings
 - moved rotator removal from probe to a separate patch
---
 drivers/mfd/stmpe.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 4aa4ac2ff406..987e251d90ae 100644
--- a/drivers/mfd/stmpe.c
+++ b/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;
-		}
 	}
 }
 
-- 
2.25.1