The PXA reset driver still uses the legacy GPIO interface for
configuring and asserting the reset pin.
Convert it to use the GPIO descriptor interface.
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Duje Mihanović <[email protected]>
---
arch/arm/mach-pxa/reset.c | 39 +++++++++++++--------------------------
arch/arm/mach-pxa/reset.h | 3 +--
arch/arm/mach-pxa/spitz.c | 6 +++++-
3 files changed, 19 insertions(+), 29 deletions(-)
diff --git a/arch/arm/mach-pxa/reset.c b/arch/arm/mach-pxa/reset.c
index 27293549f8ad..2bfa66f99555 100644
--- a/arch/arm/mach-pxa/reset.c
+++ b/arch/arm/mach-pxa/reset.c
@@ -2,7 +2,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <asm/proc-fns.h>
#include <asm/system_misc.h>
@@ -14,33 +14,20 @@
static void do_hw_reset(void);
-static int reset_gpio = -1;
+static struct gpio_desc *reset_gpio;
-int init_gpio_reset(int gpio, int output, int level)
+int init_gpio_reset(int output, int level)
{
- int rc;
-
- rc = gpio_request(gpio, "reset generator");
- if (rc) {
- printk(KERN_ERR "Can't request reset_gpio\n");
- goto out;
+ reset_gpio = gpiod_get(NULL, "reset generator", GPIOD_ASIS);
+ if (IS_ERR(reset_gpio)) {
+ pr_err("Can't request reset_gpio: %pe\n", reset_gpio);
+ return PTR_ERR(reset_gpio);
}
if (output)
- rc = gpio_direction_output(gpio, level);
+ return gpiod_direction_output(reset_gpio, level);
else
- rc = gpio_direction_input(gpio);
- if (rc) {
- printk(KERN_ERR "Can't configure reset_gpio\n");
- gpio_free(gpio);
- goto out;
- }
-
-out:
- if (!rc)
- reset_gpio = gpio;
-
- return rc;
+ return gpiod_direction_input(reset_gpio);
}
/*
@@ -50,16 +37,16 @@ int init_gpio_reset(int gpio, int output, int level)
*/
static void do_gpio_reset(void)
{
- BUG_ON(reset_gpio == -1);
+ BUG_ON(IS_ERR(reset_gpio));
/* drive it low */
- gpio_direction_output(reset_gpio, 0);
+ gpiod_direction_output(reset_gpio, 0);
mdelay(2);
/* rising edge or drive high */
- gpio_set_value(reset_gpio, 1);
+ gpiod_set_value(reset_gpio, 1);
mdelay(2);
/* falling edge */
- gpio_set_value(reset_gpio, 0);
+ gpiod_set_value(reset_gpio, 0);
/* give it some time */
mdelay(10);
diff --git a/arch/arm/mach-pxa/reset.h b/arch/arm/mach-pxa/reset.h
index 963dd190bc13..5864f61a0e94 100644
--- a/arch/arm/mach-pxa/reset.h
+++ b/arch/arm/mach-pxa/reset.h
@@ -13,10 +13,9 @@ extern void pxa_register_wdt(unsigned int reset_status);
/**
* init_gpio_reset() - register GPIO as reset generator
- * @gpio: gpio nr
* @output: set gpio as output instead of input during normal work
* @level: output level
*/
-extern int init_gpio_reset(int gpio, int output, int level);
+extern int init_gpio_reset(int output, int level);
#endif /* __ASM_ARCH_RESET_H */
diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index 965354e64c68..701fba130ac4 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -1024,9 +1024,13 @@ static void spitz_restart(enum reboot_mode mode, const char *cmd)
spitz_poweroff();
}
+GPIO_LOOKUP_SINGLE(spitz_reset_gpio_table, NULL, "pxa-gpio",
+ SPITZ_GPIO_ON_RESET, "reset generator", GPIO_ACTIVE_HIGH);
+
static void __init spitz_init(void)
{
- init_gpio_reset(SPITZ_GPIO_ON_RESET, 1, 0);
+ gpiod_add_lookup_table(&spitz_reset_gpio_table);
+ init_gpio_reset(1, 0);
pm_power_off = spitz_poweroff;
PMCR = 0x00;
--
2.42.0
On Sun, Oct 1, 2023 at 5:13 PM Duje Mihanović <[email protected]> wrote:
>
> The PXA reset driver still uses the legacy GPIO interface for
> configuring and asserting the reset pin.
>
> Convert it to use the GPIO descriptor interface.
> Acked-by: Linus Walleij <[email protected]>
I dunno how.
...
> + reset_gpio = gpiod_get(NULL, "reset generator", GPIOD_ASIS);
> + if (IS_ERR(reset_gpio)) {
> + pr_err("Can't request reset_gpio: %pe\n", reset_gpio);
> + return PTR_ERR(reset_gpio);
> }
Here you asked for the GPIO named as "reset generator-gpio(s)" (The
"(s)" part is for new bindings), but you must not use spaces in the
GPIO names. Moreover the string literal there is for labeling, and not
for matching.
...
> +GPIO_LOOKUP_SINGLE(spitz_reset_gpio_table, NULL, "pxa-gpio",
And here should be gpios. That's what you have to request, but because
of the global (device-less) nature of this, you have to be very
careful to avoid any clashes.
> + SPITZ_GPIO_ON_RESET, "reset generator", GPIO_ACTIVE_HIGH);
...
TBH, I don't know how it is supposed to work with your current code
and if Linus really was okay with this.
--
With Best Regards,
Andy Shevchenko
On Sun, Oct 1, 2023 at 5:40 PM Andy Shevchenko
<[email protected]> wrote:
> On Sun, Oct 1, 2023 at 5:13 PM Duje Mihanović <[email protected]> wrote:
...
> TBH, I don't know how it is supposed to work with your current code
> and if Linus really was okay with this.
Okay, it seems I have to refresh my memories about GPIO lookup tables.
First of all, we indeed require a connection ID just to match and no
matter if it has or hasn't the suffix.Second, the key is a label of
the GPIO controller according to the device driver (device tree?) and
pxa-gpio is that one. Seems it should work.
--
With Best Regards,
Andy Shevchenko