Hi Javier,
You are in a lead of 3 hrs from me..
Surprisingly I send very much same patch just few Mins ago :-)
May be we can merge goods in both :-)
On 28/01/15 10:10, Javier Martinez Canillas wrote:
Many WLAN attached to a SDIO/MMC interface, needs more than one pin for
their reset sequence. For example, is very common for chips to have two
pins: one for reset and one for power enable.
This patch adds support for more reset pins to the pwrseq_simple driver
and instead hardcoding a fixed number, it uses the of_gpio_named_count()
since the MMC power sequence is only built when CONFIG_OF is enabled.
Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
---
drivers/mmc/core/pwrseq_simple.c | 54 ++++++++++++++++++++++++++++++----------
1 file changed, 41 insertions(+), 13 deletions(-)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 0958c696137f..9e51fe1051c5 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -11,6 +11,7 @@
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/err.h>
+#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/mmc/host.h>
@@ -19,34 +20,44 @@
struct mmc_pwrseq_simple {
struct mmc_pwrseq pwrseq;
- struct gpio_desc *reset_gpio;
+ struct gpio_desc **reset_gpio;
May be renaming it to reset_gpios makes more sense..
If you make this struct gpio_desc *reset_gpios[0]; You can aviod an
extra kmalloc and free ..
+ int nr_gpios;
};
static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
{
[...
struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
struct mmc_pwrseq_simple, pwrseq);
+ int i;
- if (!IS_ERR(pwrseq->reset_gpio))
- gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
+ for (i = 0; i < pwrseq->nr_gpios; i++)
+ if (!IS_ERR(pwrseq->reset_gpio[i]))
+ gpiod_set_value_cansleep(pwrseq->reset_gpio[i], 1);
...]
}
static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
{
[...
struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
struct mmc_pwrseq_simple, pwrseq);
+ int i;
- if (!IS_ERR(pwrseq->reset_gpio))
- gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
+ for (i = 0; i < pwrseq->nr_gpios; i++)
+ if (!IS_ERR(pwrseq->reset_gpio[i]))
+ gpiod_set_value_cansleep(pwrseq->reset_gpio[i], 0);
...]
Now that we have more code in mmc_pwrseq_simple_post_power_on() and
mmc_pwrseq_simple_pre_power_on(), Just move most of them into a common
function like:
static void __mmc_pwrseq_simple_power_on_off(struct mmc_host *host,
bool on)
{
struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
struct mmc_pwrseq_simple, pwrseq);
int i;
if (!IS_ERR(pwrseq->reset_gpios)) {
for (i = 0; i < pwrseq->ngpios; i++)
gpiod_set_value_cansleep(pwrseq->reset_gpios[i],
on ? : 0);
}
}
static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
{
__mmc_pwrseq_simple_power_on_off(host, true);
}
static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
{
__mmc_pwrseq_simple_power_on_off(host, false);
}
}
static void mmc_pwrseq_simple_free(struct mmc_host *host)
{
struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
struct mmc_pwrseq_simple, pwrseq);
+ int i;
- if (!IS_ERR(pwrseq->reset_gpio))
- gpiod_put(pwrseq->reset_gpio);
+ if (pwrseq->nr_gpios > 0) {
+ for (i = 0; i < pwrseq->nr_gpios; i++)
+ if (!IS_ERR(pwrseq->reset_gpio[i]))
+ gpiod_put(pwrseq->reset_gpio[i]);
+ kfree(pwrseq->reset_gpio);
+ }
kfree(pwrseq);
host->pwrseq = NULL;
@@ -63,17 +74,27 @@ int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev)
{
struct mmc_pwrseq_simple *pwrseq;
int ret = 0;
+ int i;
pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple), GFP_KERNEL);
if (!pwrseq)
return -ENOMEM;
- pwrseq->reset_gpio = gpiod_get_index(dev, "reset", 0, GPIOD_OUT_HIGH);
- if (IS_ERR(pwrseq->reset_gpio) &&
- PTR_ERR(pwrseq->reset_gpio) != -ENOENT &&
- PTR_ERR(pwrseq->reset_gpio) != -ENOSYS) {
- ret = PTR_ERR(pwrseq->reset_gpio);
- goto free;
+ pwrseq->nr_gpios = of_gpio_named_count(dev->of_node, "reset-gpios");
+ if (pwrseq->nr_gpios > 0) {
What happens if there are no gpios? This fuction should return -ENOENT
and should not even try to allocate pwrseq?
Probably you should do of_gpio_named_count before allocating memory.
+ pwrseq->reset_gpio = kzalloc(sizeof(struct gpio_desc *) *
+ pwrseq->nr_gpios, GFP_KERNEL);
+
+ for (i = 0; i < pwrseq->nr_gpios; i++) {
+ pwrseq->reset_gpio[i] = gpiod_get_index(dev, "reset", i,
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(pwrseq->reset_gpio[i]) &&
+ PTR_ERR(pwrseq->reset_gpio[i]) != -ENOENT &&
+ PTR_ERR(pwrseq->reset_gpio[i]) != -ENOSYS) {
+ ret = PTR_ERR(pwrseq->reset_gpio[i]);
is simple to add:
while(--i)
gpiod_put(pwrseq->reset_gpio[i])
+ goto free;
+ }
+ }
}
pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
@@ -81,6 +102,13 @@ int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev)
return 0;
free:
+ if (pwrseq->nr_gpios > 0) {
+ for (i = 0; i < pwrseq->nr_gpios; i++)
+ if (!IS_ERR_OR_NULL(pwrseq->reset_gpio[i]))
+ gpiod_put(pwrseq->reset_gpio[i]);
+ kfree(pwrseq->reset_gpio);
+ }
+
kfree(pwrseq);
return ret;
}
I get a feeling that am just dumping my patch here.. If possible could
you have look at it too.
Thanks,
srini
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