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authorLinus Torvalds <torvalds@linux-foundation.org>2020-02-07 12:54:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-07 12:54:13 -0800
commit11777ee8b04acab07c96959e9c6ac6a1603d0958 (patch)
tree52a7bf02de5076afd4bac1b351bdd2f7c59ff847 /drivers/nvmem
parented39ba0ec1156407040e7509cb19299b5dda3815 (diff)
parentb49f8e0e7bd17b968129790e40f9e2566f4f95ec (diff)
Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang: "i2c core: - huge improvements and refactorizations of the Linux I2C documentation (lots of thanks to Luca for doing it and Jean for the careful review) - subsystem wide API conversion to i2c_new_client_device() - remove obsolete parport-light driver - smaller core updates (removal of 'extern', enabling more compile testing, use more helper macros) - and quite a bunch of driver updates (new IDs, simplifications, better PM, support of atomic transfers and other improvements) i2c-mux: - The main feature is the idle-state rework of the pca954x driver from Biwen Li at24 driver: - minor maintenance: update the license tag, sort headers - move support for the write-protect pin into nvmem core - add a reference to the new wp-gpios property in nvmem to at25 bindings - add support for regulator and pm_runtime control" * 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (91 commits) i2c: cros-ec-tunnel: Fix ACPI identifier i2c: cros-ec-tunnel: Fix slave device enumeration i2c: stm32f7: add PM_SLEEP suspend/resume support i2c: cadence: Fix wording in i2c-cadence driver i2c: cadence: Fix power management order of operations i2c: cadence: Fix error printing in case of defer i2c: cadence: Handle transfer_size rollover i2c: i801: Add support for Intel Comet Lake PCH-V docs: i2c: writing-clients: properly name the stop condition docs: i2c: i2c-protocol: use same wording as smbus-protocol docs: i2c: rename sections so the overall picture is clearer docs: i2c: old-module-parameters: use monospace instead of "" docs: i2c: old-module-parameters: clarify this is for obsolete kernels docs: i2c: old-module-parameters: fix internal hyperlink docs: i2c: instantiating-devices: use monospace for sysfs attributes docs: i2c: instantiating-devices: rearrange static instatiation docs: i2c: instantiating-devices: fix internal hyperlink docs: i2c: smbus-protocol: improve I2C Block transactions description docs: i2c: smbus-protocol: fix punctuation docs: i2c: smbus-protocol: fix typo ...
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c19
-rw-r--r--drivers/nvmem/nvmem.h2
2 files changed, 19 insertions, 2 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 1e4a798dce6e..ef326f243f36 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/slab.h>
#include "nvmem.h"
@@ -54,8 +55,14 @@ static int nvmem_reg_read(struct nvmem_device *nvmem, unsigned int offset,
static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset,
void *val, size_t bytes)
{
- if (nvmem->reg_write)
- return nvmem->reg_write(nvmem->priv, offset, val, bytes);
+ int ret;
+
+ if (nvmem->reg_write) {
+ gpiod_set_value_cansleep(nvmem->wp_gpio, 0);
+ ret = nvmem->reg_write(nvmem->priv, offset, val, bytes);
+ gpiod_set_value_cansleep(nvmem->wp_gpio, 1);
+ return ret;
+ }
return -EINVAL;
}
@@ -340,6 +347,14 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
kfree(nvmem);
return ERR_PTR(rval);
}
+ if (config->wp_gpio)
+ nvmem->wp_gpio = config->wp_gpio;
+ else
+ nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(nvmem->wp_gpio))
+ return ERR_CAST(nvmem->wp_gpio);
+
kref_init(&nvmem->refcnt);
INIT_LIST_HEAD(&nvmem->cells);
diff --git a/drivers/nvmem/nvmem.h b/drivers/nvmem/nvmem.h
index eb8ed7121fa3..be0d66d75c8a 100644
--- a/drivers/nvmem/nvmem.h
+++ b/drivers/nvmem/nvmem.h
@@ -9,6 +9,7 @@
#include <linux/list.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
+#include <linux/gpio/consumer.h>
struct nvmem_device {
struct module *owner;
@@ -26,6 +27,7 @@ struct nvmem_device {
struct list_head cells;
nvmem_reg_read_t reg_read;
nvmem_reg_write_t reg_write;
+ struct gpio_desc *wp_gpio;
void *priv;
};