linux-kernel - [PATCH v3 1/5] gpio: syscon: allow fetching syscon from parent node

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Message-Id: <1527737273-8387-2-git-send-email-djw@t-chip.com.cn>
Date:   Thu, 31 May 2018 11:27:49 +0800
From:   djw@...hip.com.cn
To:     linux-rockchip@...ts.infradead.org
Cc:     Wayne Chou <zxf@...hip.com.cn>, Levin Du <djw@...hip.com.cn>,
        Heiko Stuebner <heiko@...ech.de>, linux-gpio@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/5] gpio: syscon: allow fetching syscon from parent node

From: Heiko Stuebner <heiko@...ech.de>

Syscon nodes can be a simple-mfd and the syscon-users then be declared
as children of this node. That way the parent-child structure can be
better represented for devices that are fully embedded in the syscon.

Therefore allow getting the syscon from the parent if neither
a special compatible nor a gpio,syscon-dev property is defined.

Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Levin Du <djw@...hip.com.cn>
---

Changes in v3: None
Changes in v2: None
Changes in v1:
- New: allow fetching syscon from parent node in gpio-syscon driver

 drivers/gpio/gpio-syscon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 537cec7..7325b86 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -205,6 +205,8 @@ static int syscon_gpio_probe(struct platform_device *pdev)
 	} else {
 		priv->syscon =
 			syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
+		if (IS_ERR(priv->syscon) && np->parent)
+			priv->syscon = syscon_node_to_regmap(np->parent);
 		if (IS_ERR(priv->syscon))
 			return PTR_ERR(priv->syscon);
 
-- 
2.7.4