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authorAlexandre Courbot <acourbot@nvidia.com>2013-02-02 20:29:24 +0400
committerGrant Likely <grant.likely@secretlab.ca>2013-02-09 13:20:12 +0400
commit1a989d0f1de8f5a150b35e1e8181cc1abc139162 (patch)
tree5d1a3b1009d2ec1ee84abf3d2a120a46b4748f87 /include/asm-generic/gpio.h
parent0fa2fd9a0d4f1305a54a396d44975894e90eed7b (diff)
downloadlinux-1a989d0f1de8f5a150b35e1e8181cc1abc139162.tar.xz
gpiolib: link all gpio_chips using a list
Add a list member to gpio_chip that allows all chips to be parsed quickly. The current method requires parsing the entire GPIO integer space, which is painfully slow. Using a list makes many chip operations that involve lookup or parsing faster, and also simplifies the code. It is also necessary to eventually get rid of the global gpio_desc[] array. The list of gpio_chips is always ordered by base GPIO number to ensure chips traversal is done in the right order. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/asm-generic/gpio.h')
-rw-r--r--include/asm-generic/gpio.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 2034e691c7ab..b562f95cdc2f 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -53,6 +53,7 @@ struct device_node;
* @label: for diagnostics
* @dev: optional device providing the GPIOs
* @owner: helps prevent removal of modules exporting active GPIOs
+ * @list: links gpio_chips together for traversal
* @request: optional hook for chip-specific activation, such as
* enabling module power and clock; may sleep
* @free: optional hook for chip-specific deactivation, such as
@@ -98,6 +99,7 @@ struct gpio_chip {
const char *label;
struct device *dev;
struct module *owner;
+ struct list_head list;
int (*request)(struct gpio_chip *chip,
unsigned offset);