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Message-ID: <CAJZ5v0jfiv3ARnZoAoWPUN57_JTXbV2DFKSy6Qe3PsYTZA7EXw@mail.gmail.com>
Date: Mon, 13 Jan 2025 20:06:55 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Daniel Scally <djrscally@...il.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Danilo Krummrich <dakr@...nel.org>,
Saravana Kannan <saravanak@...gle.com>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] device property: Split property reading bool and
presence test ops
On Thu, Jan 9, 2025 at 8:42 PM Rob Herring (Arm) <robh@...nel.org> wrote:
>
> The fwnode/device property API currently implement
> (fwnode|device)_property_read_bool() with (fwnode|device)_property_present().
> That does not allow having different behavior depending on the backend.
>
> Specifically, the usage of (fwnode|device)_property_read_bool() on
> non-boolean properties is deprecated on DT. In order to add a warning
> on this deprecated use, these 2 APIs need separate ops for the backend.
>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
and please route this as needed.
> ---
> drivers/acpi/property.c | 1 +
> drivers/base/property.c | 38 ++++++++++++++++++++++++++++++++++++++
> drivers/base/swnode.c | 1 +
> drivers/of/property.c | 7 +++++++
> include/linux/fwnode.h | 3 +++
> include/linux/of.h | 4 +++-
> include/linux/property.h | 15 +++------------
> 7 files changed, 56 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
> index 80a52a4e66dd167e70c80a164a89beb8c834ae13..8c53959ee31e700004de098bdab21dec118cf111 100644
> --- a/drivers/acpi/property.c
> +++ b/drivers/acpi/property.c
> @@ -1656,6 +1656,7 @@ static int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
> acpi_fwnode_device_dma_supported, \
> .device_get_dma_attr = acpi_fwnode_device_get_dma_attr, \
> .property_present = acpi_fwnode_property_present, \
> + .property_read_bool = acpi_fwnode_property_present, \
> .property_read_int_array = \
> acpi_fwnode_property_read_int_array, \
> .property_read_string_array = \
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 837d77e3af2bd5bf655e6fa0f64c10a05b361b90..c1392743df9c3f6c554f093f4efae3ea1ad1fdf2 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -70,6 +70,44 @@ bool fwnode_property_present(const struct fwnode_handle *fwnode,
> }
> EXPORT_SYMBOL_GPL(fwnode_property_present);
>
> +/**
> + * device_property_read_bool - Return the value for a boolean property of a device
> + * @dev: Device whose property is being checked
> + * @propname: Name of the property
> + *
> + * Return if property @propname is true or false in the device firmware description.
> + *
> + * Return: true if property @propname is present. Otherwise, returns false.
> + */
> +bool device_property_read_bool(const struct device *dev, const char *propname)
> +{
> + return fwnode_property_read_bool(dev_fwnode(dev), propname);
> +}
> +EXPORT_SYMBOL_GPL(device_property_read_bool);
> +
> +/**
> + * fwnode_property_read_bool - Return the value for a boolean property of a firmware node
> + * @fwnode: Firmware node whose property to check
> + * @propname: Name of the property
> + *
> + * Return if property @propname is true or false in the firmware description.
> + */
> +bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
> + const char *propname)
> +{
> + bool ret;
> +
> + if (IS_ERR_OR_NULL(fwnode))
> + return false;
> +
> + ret = fwnode_call_bool_op(fwnode, property_read_bool, propname);
> + if (ret)
> + return ret;
> +
> + return fwnode_call_bool_op(fwnode->secondary, property_read_bool, propname);
> +}
> +EXPORT_SYMBOL_GPL(fwnode_property_read_bool);
> +
> /**
> * device_property_read_u8_array - return a u8 array property of a device
> * @dev: Device to get the property of
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index eb6eb25b343bafaa9c03f881b98a528305fa6093..b1726a3515f6fbe13c2186af1f74479263798e42 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -677,6 +677,7 @@ static const struct fwnode_operations software_node_ops = {
> .get = software_node_get,
> .put = software_node_put,
> .property_present = software_node_property_present,
> + .property_read_bool = software_node_property_present,
> .property_read_int_array = software_node_read_int_array,
> .property_read_string_array = software_node_read_string_array,
> .get_name = software_node_get_name,
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 519bf9229e613906547b57d8c68e7b8558eff327..1b46be88cc0498fcbe74e7b988f22a86245c366e 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -965,6 +965,12 @@ of_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode)
>
> static bool of_fwnode_property_present(const struct fwnode_handle *fwnode,
> const char *propname)
> +{
> + return of_property_present(to_of_node(fwnode), propname);
> +}
> +
> +static bool of_fwnode_property_read_bool(const struct fwnode_handle *fwnode,
> + const char *propname)
> {
> return of_property_read_bool(to_of_node(fwnode), propname);
> }
> @@ -1562,6 +1568,7 @@ const struct fwnode_operations of_fwnode_ops = {
> .device_dma_supported = of_fwnode_device_dma_supported,
> .device_get_dma_attr = of_fwnode_device_get_dma_attr,
> .property_present = of_fwnode_property_present,
> + .property_read_bool = of_fwnode_property_read_bool,
> .property_read_int_array = of_fwnode_property_read_int_array,
> .property_read_string_array = of_fwnode_property_read_string_array,
> .get_name = of_fwnode_get_name,
> diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> index 0d79070c5a70f21e9d73751941f28cefb244950d..0731994b9d7c832cae8a30063f3a64194e4f19aa 100644
> --- a/include/linux/fwnode.h
> +++ b/include/linux/fwnode.h
> @@ -112,6 +112,7 @@ struct fwnode_reference_args {
> * @device_is_available: Return true if the device is available.
> * @device_get_match_data: Return the device driver match data.
> * @property_present: Return true if a property is present.
> + * @property_read_bool: Return a boolean property value.
> * @property_read_int_array: Read an array of integer properties. Return zero on
> * success, a negative error code otherwise.
> * @property_read_string_array: Read an array of string properties. Return zero
> @@ -141,6 +142,8 @@ struct fwnode_operations {
> (*device_get_dma_attr)(const struct fwnode_handle *fwnode);
> bool (*property_present)(const struct fwnode_handle *fwnode,
> const char *propname);
> + bool (*property_read_bool)(const struct fwnode_handle *fwnode,
> + const char *propname);
> int (*property_read_int_array)(const struct fwnode_handle *fwnode,
> const char *propname,
> unsigned int elem_size, void *val,
> diff --git a/include/linux/of.h b/include/linux/of.h
> index f921786cb8ac782286ed5ff4425a35668204d050..1cb4eb7fc2eded2246c697c3bcaf1b85d43108ab 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -1271,7 +1271,9 @@ static inline bool of_property_read_bool(const struct device_node *np,
> */
> static inline bool of_property_present(const struct device_node *np, const char *propname)
> {
> - return of_property_read_bool(np, propname);
> + struct property *prop = of_find_property(np, propname, NULL);
> +
> + return prop ? true : false;
> }
>
> /**
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 61fc20e5f81f8da992aa021996ddf68ef3eff0ed..e214ecd241eb4e6d9e0873d094f2c956bbf66c34 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -37,6 +37,7 @@ struct fwnode_handle *__dev_fwnode(struct device *dev);
> struct device *: __dev_fwnode)(dev)
>
> bool device_property_present(const struct device *dev, const char *propname);
> +bool device_property_read_bool(const struct device *dev, const char *propname);
> int device_property_read_u8_array(const struct device *dev, const char *propname,
> u8 *val, size_t nval);
> int device_property_read_u16_array(const struct device *dev, const char *propname,
> @@ -54,6 +55,8 @@ int device_property_match_string(const struct device *dev,
>
> bool fwnode_property_present(const struct fwnode_handle *fwnode,
> const char *propname);
> +bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
> + const char *propname);
> int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
> const char *propname, u8 *val,
> size_t nval);
> @@ -207,12 +210,6 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
>
> unsigned int device_get_child_node_count(const struct device *dev);
>
> -static inline bool device_property_read_bool(const struct device *dev,
> - const char *propname)
> -{
> - return device_property_present(dev, propname);
> -}
> -
> static inline int device_property_read_u8(const struct device *dev,
> const char *propname, u8 *val)
> {
> @@ -263,12 +260,6 @@ static inline int device_property_string_array_count(const struct device *dev,
> return device_property_read_string_array(dev, propname, NULL, 0);
> }
>
> -static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
> - const char *propname)
> -{
> - return fwnode_property_present(fwnode, propname);
> -}
> -
> static inline int fwnode_property_read_u8(const struct fwnode_handle *fwnode,
> const char *propname, u8 *val)
> {
>
> --
> 2.45.2
>
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