On Friday 27 April 2018 05:47 PM, Alex Elder wrote:
On 04/27/2018 05:52 AM, Arvind Yadav wrote:
Replace the manual validity checks for the GPIO with the
gpio_is_valid().
I haven't looked through the code paths very closely, but I
think that get_named_gpio() might return -EPROBE_DEFER, which
would be something we want to pass to the caller.
Yes of_get_name_gpio() can return other error value apart from
-EPROBE_DEFER.
So rather than returning -ENODEV and hiding the reason the
call to of_get_named_gpio() failed, you should continue
returning the errno it supplies (if not a valid gpio number).
-Alex
I have return -ENODEV because invalid gpio pin can be positive.
static inline bool gpio_is_valid(int number)
{
return number >= 0 && number < ARCH_NR_GPIOS;
}
Here if number > ARCH_NR_GPIOS then it's invalid but return value
will be positive.
We can return like this
" return (gpio > 0) ? -ENODEV: gpio;"
But not sure this is worth to handle this.
~arvind
Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
---
drivers/staging/greybus/arche-platform.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index 83254a7..fc6bf60 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -448,9 +448,9 @@ static int arche_platform_probe(struct platform_device *pdev)
arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
"svc,reset-gpio",
0);
- if (arche_pdata->svc_reset_gpio < 0) {
+ if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
dev_err(dev, "failed to get reset-gpio\n");
- return arche_pdata->svc_reset_gpio;
+ return -ENODEV;
}
ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
if (ret) {
@@ -468,9 +468,9 @@ static int arche_platform_probe(struct platform_device *pdev)
arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
"svc,sysboot-gpio",
0);
- if (arche_pdata->svc_sysboot_gpio < 0) {
+ if (!gpio_is_valid(arche_pdata->svc_sysboot_gpio)) {
dev_err(dev, "failed to get sysboot gpio\n");
- return arche_pdata->svc_sysboot_gpio;
+ return -ENODEV;
}
ret = devm_gpio_request(dev, arche_pdata->svc_sysboot_gpio, "sysboot0");
if (ret) {
@@ -487,9 +487,9 @@ static int arche_platform_probe(struct platform_device *pdev)
arche_pdata->svc_refclk_req = of_get_named_gpio(np,
"svc,refclk-req-gpio",
0);
- if (arche_pdata->svc_refclk_req < 0) {
+ if (!gpio_is_valid(arche_pdata->svc_refclk_req)) {
dev_err(dev, "failed to get svc clock-req gpio\n");
- return arche_pdata->svc_refclk_req;
+ return -ENODEV;
}
ret = devm_gpio_request(dev, arche_pdata->svc_refclk_req,
"svc-clk-req");
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