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From 0eda4c5c7704363f665f4ccf0327349faad245a4 Mon Sep 17 00:00:00 2001
From: Caleb Connolly <caleb.connolly@linaro.org>
Date: Fri, 29 Apr 2022 23:08:56 +0100
Subject: [PATCH] spmi: add a helper to look up an SPMI device from a device
node
The helper function spmi_device_from_of() takes a device node and
returns the SPMI device associated with it.
This is like of_find_device_by_node but for SPMI devices.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220429220904.137297-2-caleb.connolly@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
drivers/spmi/spmi.c | 17 +++++++++++++++++
include/linux/spmi.h | 3 +++
2 files changed, 20 insertions(+)
--- a/drivers/spmi/spmi.c
+++ b/drivers/spmi/spmi.c
@@ -388,6 +388,23 @@ static struct bus_type spmi_bus_type = {
};
/**
+ * spmi_device_from_of() - get the associated SPMI device from a device node
+ *
+ * @np: device node
+ *
+ * Returns the struct spmi_device associated with a device node or NULL.
+ */
+struct spmi_device *spmi_device_from_of(struct device_node *np)
+{
+ struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
+
+ if (dev)
+ return to_spmi_device(dev);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(spmi_device_from_of);
+
+/**
* spmi_controller_alloc() - Allocate a new SPMI device
* @ctrl: associated controller
*
--- a/include/linux/spmi.h
+++ b/include/linux/spmi.h
@@ -164,6 +164,9 @@ static inline void spmi_driver_unregiste
module_driver(__spmi_driver, spmi_driver_register, \
spmi_driver_unregister)
+struct device_node;
+
+struct spmi_device *spmi_device_from_of(struct device_node *np);
int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
size_t len);
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