linux-kernel - [PATCH] mfd: stmpe: Support disabling sub-functions

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Message-Id: <20201226094722.16580-1-oleksandr.suvorov@toradex.com>
Date:   Sat, 26 Dec 2020 11:47:22 +0200
From:   Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
To:     linux-next@...r.kernel.org
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Igor Opaniuk <igor.opaniuk@...adex.com>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH] mfd: stmpe: Support disabling sub-functions

Add support of sub-functions disabling. It allows one to define
an stmpe sub-function device in devicetree, but keep it disabled.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
---

 drivers/mfd/stmpe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 90f3292230c9..2182607b75f6 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1358,6 +1358,9 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
 	pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
 
 	for_each_child_of_node(np, child) {
+		/* skip disabled sub-function */
+		if (!of_device_is_available(child))
+			continue;
 		if (of_node_name_eq(child, "stmpe_gpio")) {
 			pdata->blocks |= STMPE_BLOCK_GPIO;
 		} else if (of_node_name_eq(child, "stmpe_keypad")) {
-- 
2.29.2