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58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
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From 0eda4c5c7704363f665f4ccf0327349faad245a4 Mon Sep 17 00:00:00 2001
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From: Caleb Connolly <caleb.connolly@linaro.org>
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Date: Fri, 29 Apr 2022 23:08:56 +0100
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Subject: [PATCH] spmi: add a helper to look up an SPMI device from a device
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node
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The helper function spmi_device_from_of() takes a device node and
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returns the SPMI device associated with it.
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This is like of_find_device_by_node but for SPMI devices.
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Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
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Acked-by: Stephen Boyd <sboyd@kernel.org>
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Link: https://lore.kernel.org/r/20220429220904.137297-2-caleb.connolly@linaro.org
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Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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---
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drivers/spmi/spmi.c | 17 +++++++++++++++++
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include/linux/spmi.h | 3 +++
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2 files changed, 20 insertions(+)
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--- a/drivers/spmi/spmi.c
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+++ b/drivers/spmi/spmi.c
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@@ -387,6 +387,23 @@ static struct bus_type spmi_bus_type = {
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};
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/**
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+ * spmi_device_from_of() - get the associated SPMI device from a device node
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+ *
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+ * @np: device node
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+ *
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+ * Returns the struct spmi_device associated with a device node or NULL.
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+ */
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+struct spmi_device *spmi_device_from_of(struct device_node *np)
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+{
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+ struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
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+
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+ if (dev)
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+ return to_spmi_device(dev);
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+ return NULL;
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+}
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+EXPORT_SYMBOL_GPL(spmi_device_from_of);
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+
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+/**
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* spmi_controller_alloc() - Allocate a new SPMI device
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* @ctrl: associated controller
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*
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--- a/include/linux/spmi.h
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+++ b/include/linux/spmi.h
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@@ -164,6 +164,9 @@ static inline void spmi_driver_unregiste
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module_driver(__spmi_driver, spmi_driver_register, \
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spmi_driver_unregister)
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+struct device_node;
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+
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+struct spmi_device *spmi_device_from_of(struct device_node *np);
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int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
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int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
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size_t len);
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