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

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Message-Id: <20211027082155.206449-1-francesco.dolcini@toradex.com>
Date:   Wed, 27 Oct 2021 10:21:55 +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>
Cc:     marcel.ziswiler@...adex.com,
        Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Oleksandr Suvorov <oleksandr.suvorov@...ndries.io>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: stmpe: Support disabling sub-functions

From: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>

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>
Cc: Oleksandr Suvorov <oleksandr.suvorov@...ndries.io>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
Hello,
the main reason for this patch is to allow enabling/disabling sub-fuctions
using DTS overlay to enable more flexibility on SoM/Carrier boards
combinations.
---
 drivers/mfd/stmpe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index e928df95e316..aeb9ea55f97d 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1361,7 +1361,7 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
 
 	pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
 
-	for_each_child_of_node(np, child) {
+	for_each_available_child_of_node(np, child) {
 		if (of_node_name_eq(child, "stmpe_gpio")) {
 			pdata->blocks |= STMPE_BLOCK_GPIO;
 		} else if (of_node_name_eq(child, "stmpe_keypad")) {
-- 
2.25.1