[PATCH 03/18] mfd: mfd-core: match device tree node against reg property
From: Michael Walle <hidden>
Date: 2020-03-17 20:50:55
Also in:
linux-arm-kernel, linux-gpio, linux-hwmon, linux-pwm, linux-watchdog, lkml
Subsystem:
multifunction devices (mfd), the rest · Maintainers:
Lee Jones, Linus Torvalds
There might be multiple children with the device tree compatible, for example if a MFD has multiple instances of the same function. In this case only the first is matched and the other children get a wrong of_node reference. We distinguish them by looking at the reg property and match it against the mfd_cell id element if the latter is non-zero and the reg property exists in the device tree node. Signed-off-by: Michael Walle <redacted> --- drivers/mfd/mfd-core.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index e735565969b3..0e718e6cdbde 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c@@ -117,6 +117,7 @@ static int mfd_add_device(struct device *parent, int id, struct device_node *np = NULL; int ret = -ENOMEM; int platform_id; + u32 of_id; int r; if (id == PLATFORM_DEVID_AUTO)
@@ -151,16 +152,23 @@ static int mfd_add_device(struct device *parent, int id, if (parent->of_node && cell->of_compatible) { for_each_child_of_node(parent->of_node, np) { - if (of_device_is_compatible(np, cell->of_compatible)) { - if (!of_device_is_available(np)) { - /* Ignore disabled devices error free */ - ret = 0; - goto fail_alias; - } - pdev->dev.of_node = np; - pdev->dev.fwnode = &np->fwnode; - break; + if (!of_device_is_compatible(np, cell->of_compatible)) + continue; + + /* match the reg property to the id */ + if (!of_property_read_u32(np, "reg", &of_id)) + if (cell->id && cell->id != of_id) + continue; + + if (!of_device_is_available(np)) { + /* Ignore disabled devices error free */ + ret = 0; + goto fail_alias; } + + pdev->dev.of_node = np; + pdev->dev.fwnode = &np->fwnode; + break; } }
--
2.20.1