From: Tony Prisk <linux@prisktech.co.nz> To: Linus Walleij <linus.walleij@linaro.org> Cc: linux-arm-kernel@lists.infradead.org, vt8500-wm8505-linux-kernel@googlegroups.com, swarren@wwwdotorg.org, arnd@arndb.de, olof@lixom.net, linux-kernel@vger.kernel.org, Tony Prisk <linux@prisktech.co.nz> Subject: [PATCHv3 1/6] of: Add support for reading a u32 from a multi-value property. Date: Thu, 28 Mar 2013 19:10:44 +1300 [thread overview] Message-ID: <1364451049-2981-2-git-send-email-linux@prisktech.co.nz> (raw) In-Reply-To: <1364451049-2981-1-git-send-email-linux@prisktech.co.nz> This patch adds an of_property_read_u32_index() function to allow reading a single indexed u32 value from a property containing multiple u32 values. Signed-off-by: Tony Prisk <linux@prisktech.co.nz> --- drivers/of/base.c | 33 +++++++++++++++++++++++++++++++++ include/linux/of.h | 9 +++++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 321d3ef..7dc001e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -746,6 +746,39 @@ struct device_node *of_find_node_by_phandle(phandle handle) EXPORT_SYMBOL(of_find_node_by_phandle); /** + * of_property_read_u32_index - Find and read a u32 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u32 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 32-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid u32 value can be decoded. + */ +int of_property_read_u32_index(const struct device_node *np, + const char *propname, + u32 index, u32 *out_value) +{ + struct property *prop = of_find_property(np, propname, NULL); + + if (!prop) + return -EINVAL; + if (!prop->value) + return -ENODATA; + if ((index * sizeof(*out_value)) > prop->length) + return -EOVERFLOW; + + *out_value = be32_to_cpup(((__be32 *)prop->value) + index); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u32_index); + +/** * of_property_read_u8_array - Find and read an array of u8 from a property. * * @np: device node from which the property value is to be read. diff --git a/include/linux/of.h b/include/linux/of.h index a0f1292..c0747a4 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -235,6 +235,9 @@ extern struct device_node *of_find_node_with_property( extern struct property *of_find_property(const struct device_node *np, const char *name, int *lenp); +extern int of_property_read_u32_index(const struct device_node *np, + const char *propname, + u32 index, u32 *out_value); extern int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz); extern int of_property_read_u16_array(const struct device_node *np, @@ -394,6 +397,12 @@ static inline struct device_node *of_find_compatible_node( return NULL; } +static inline int of_property_read_u32_index(const struct device_node *np, + const char *propname, u32 index, u32 *out_value) +{ + return -ENOSYS; +} + static inline int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz) { -- 1.7.9.5
WARNING: multiple messages have this Message-ID (diff)
From: linux@prisktech.co.nz (Tony Prisk) To: linux-arm-kernel@lists.infradead.org Subject: [PATCHv3 1/6] of: Add support for reading a u32 from a multi-value property. Date: Thu, 28 Mar 2013 19:10:44 +1300 [thread overview] Message-ID: <1364451049-2981-2-git-send-email-linux@prisktech.co.nz> (raw) In-Reply-To: <1364451049-2981-1-git-send-email-linux@prisktech.co.nz> This patch adds an of_property_read_u32_index() function to allow reading a single indexed u32 value from a property containing multiple u32 values. Signed-off-by: Tony Prisk <linux@prisktech.co.nz> --- drivers/of/base.c | 33 +++++++++++++++++++++++++++++++++ include/linux/of.h | 9 +++++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 321d3ef..7dc001e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -746,6 +746,39 @@ struct device_node *of_find_node_by_phandle(phandle handle) EXPORT_SYMBOL(of_find_node_by_phandle); /** + * of_property_read_u32_index - Find and read a u32 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u32 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 32-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid u32 value can be decoded. + */ +int of_property_read_u32_index(const struct device_node *np, + const char *propname, + u32 index, u32 *out_value) +{ + struct property *prop = of_find_property(np, propname, NULL); + + if (!prop) + return -EINVAL; + if (!prop->value) + return -ENODATA; + if ((index * sizeof(*out_value)) > prop->length) + return -EOVERFLOW; + + *out_value = be32_to_cpup(((__be32 *)prop->value) + index); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u32_index); + +/** * of_property_read_u8_array - Find and read an array of u8 from a property. * * @np: device node from which the property value is to be read. diff --git a/include/linux/of.h b/include/linux/of.h index a0f1292..c0747a4 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -235,6 +235,9 @@ extern struct device_node *of_find_node_with_property( extern struct property *of_find_property(const struct device_node *np, const char *name, int *lenp); +extern int of_property_read_u32_index(const struct device_node *np, + const char *propname, + u32 index, u32 *out_value); extern int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz); extern int of_property_read_u16_array(const struct device_node *np, @@ -394,6 +397,12 @@ static inline struct device_node *of_find_compatible_node( return NULL; } +static inline int of_property_read_u32_index(const struct device_node *np, + const char *propname, u32 index, u32 *out_value) +{ + return -ENOSYS; +} + static inline int of_property_read_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz) { -- 1.7.9.5
next prev parent reply other threads:[~2013-03-28 6:10 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-03-28 6:10 [PATCHv3 0/6] arm: vt8500: Add support for pinctrl/gpio module Tony Prisk 2013-03-28 6:10 ` Tony Prisk 2013-03-28 6:10 ` Tony Prisk [this message] 2013-03-28 6:10 ` [PATCHv3 1/6] of: Add support for reading a u32 from a multi-value property Tony Prisk 2013-04-01 16:49 ` Stephen Warren 2013-04-01 16:49 ` Stephen Warren 2013-03-28 6:10 ` [PATCHv3 2/6] arm: vt8500: Increase available GPIOs on arch-vt8500 Tony Prisk 2013-03-28 6:10 ` Tony Prisk 2013-03-28 6:10 ` [PATCHv3 3/6] pinctrl: gpio: vt8500: Add pincontrol driver for arch-vt8500 Tony Prisk 2013-03-28 6:10 ` Tony Prisk 2013-04-01 17:06 ` Stephen Warren 2013-04-01 17:06 ` Stephen Warren 2013-04-01 18:59 ` Tony Prisk 2013-04-01 18:59 ` Tony Prisk 2013-04-01 19:02 ` Stephen Warren 2013-04-01 19:02 ` Stephen Warren 2013-03-28 6:10 ` [PATCHv3 4/6] arm: dts: vt8500: Update Wondermedia SoC dtsi files for pinctrl driver Tony Prisk 2013-03-28 6:10 ` Tony Prisk 2013-03-28 6:10 ` [PATCHv3 5/6] arm: vt8500: Remove gpio devicetree nodes Tony Prisk 2013-03-28 6:10 ` Tony Prisk 2013-03-28 6:10 ` [PATCHv3 6/6] gpio: vt8500: Remove arch-vt8500 gpio driver Tony Prisk 2013-03-28 6:10 ` Tony Prisk
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