Re: [PATCH v3 1/5] gpio: syscon: allow fetching syscon from parent node

[Linus Walleij]

On Thu, May 31, 2018 at 5:27 AM,   wrote:

> From: Heiko Stuebner 
>
> 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 
> Signed-off-by: Levin Du 

This patch has been sent upstream for v4.18.

Yours,
Linus Walleij

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

[djw]

From: Heiko Stuebner 

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 
Signed-off-by: Levin Du 
---

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