git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 0eda4c5c7704363f665f4ccf0327349faad245a4 Mon Sep 17 00:00:00 2001
   2 From: Caleb Connolly <caleb.connolly@linaro.org>
   3 Date: Fri, 29 Apr 2022 23:08:56 +0100
   4 Subject: [PATCH] spmi: add a helper to look up an SPMI device from a device
   5  node
   6
   7 The helper function spmi_device_from_of() takes a device node and
   8 returns the SPMI device associated with it.
   9 This is like of_find_device_by_node but for SPMI devices.
  10
  11 Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
  12 Acked-by: Stephen Boyd <sboyd@kernel.org>
  13 Link: https://lore.kernel.org/r/20220429220904.137297-2-caleb.connolly@linaro.org
  14 Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
  15 ---
  16  drivers/spmi/spmi.c  | 17 +++++++++++++++++
  17  include/linux/spmi.h |  3 +++
  18  2 files changed, 20 insertions(+)
  19
  20 --- a/drivers/spmi/spmi.c
  21 +++ b/drivers/spmi/spmi.c
  22 @@ -388,6 +388,23 @@ static struct bus_type spmi_bus_type = {
  23  };
  24
  25  /**
  26 + * spmi_device_from_of() - get the associated SPMI device from a device node
  27 + *
  28 + * @np:                device node
  29 + *
  30 + * Returns the struct spmi_device associated with a device node or NULL.
  31 + */
  32 +struct spmi_device *spmi_device_from_of(struct device_node *np)
  33 +{
  34 +       struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
  35 +
  36 +       if (dev)
  37 +               return to_spmi_device(dev);
  38 +       return NULL;
  39 +}
  40 +EXPORT_SYMBOL_GPL(spmi_device_from_of);
  41 +
  42 +/**
  43   * spmi_controller_alloc() - Allocate a new SPMI device
  44   * @ctrl:      associated controller
  45   *
  46 --- a/include/linux/spmi.h
  47 +++ b/include/linux/spmi.h
  48 @@ -164,6 +164,9 @@ static inline void spmi_driver_unregiste
  49         module_driver(__spmi_driver, spmi_driver_register, \
  50                         spmi_driver_unregister)
  51
  52 +struct device_node;
  53 +
  54 +struct spmi_device *spmi_device_from_of(struct device_node *np);
  55  int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
  56  int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
  57                            size_t len);