diff options
| author | Fugang Duan <fugang.duan@nxp.com> | 2017-06-15 16:45:29 +0800 |
|---|---|---|
| committer | Dong Aisheng <aisheng.dong@nxp.com> | 2019-11-25 15:45:05 +0800 |
| commit | 80fcea5b45b35bc34e2663af883a9e25005f6ca3 (patch) | |
| tree | 58e11e6e38aac08925b27abe90be29b3931b6aa7 | |
| parent | bc1f879da9bdc046f12e0192f0d2e58dbf32a977 (diff) | |
MLK-15092 reset: gpio-reset: add post reset delay
Some devices need to wait for some milliseconds after reset, so add
post reset delay in the gpio-reset chip.
The post reset delay is optional.
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Arulpandiyan Vadivel <arulpandiyan_vadivel@mentor.com>
| -rw-r--r-- | Documentation/devicetree/bindings/reset/gpio-reset.txt | 1 | ||||
| -rw-r--r-- | drivers/reset/gpio-reset.c | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/reset/gpio-reset.txt b/Documentation/devicetree/bindings/reset/gpio-reset.txt index bca5348a5131..7d45d8b810ea 100644 --- a/Documentation/devicetree/bindings/reset/gpio-reset.txt +++ b/Documentation/devicetree/bindings/reset/gpio-reset.txt @@ -14,6 +14,7 @@ Required properties: Optional properties: - reset-delay-us: delay in microseconds. The gpio reset line will be asserted for this duration to reset. +- reset-post-delay-ms: delay in milliseconds to wait after reset. - initially-in-reset: boolean. If not set, the initial state should be a deasserted reset line. If this property exists, the reset line should be kept in reset. diff --git a/drivers/reset/gpio-reset.c b/drivers/reset/gpio-reset.c index 3049b2202073..9dc768aa6f33 100644 --- a/drivers/reset/gpio-reset.c +++ b/drivers/reset/gpio-reset.c @@ -21,6 +21,7 @@ struct gpio_reset_data { unsigned int gpio; bool active_low; s32 delay_us; + s32 post_delay_ms; }; static void gpio_reset_set(struct reset_controller_dev *rcdev, int asserted) @@ -47,6 +48,10 @@ static int gpio_reset(struct reset_controller_dev *rcdev, unsigned long id) udelay(drvdata->delay_us); gpio_reset_set(rcdev, 0); + if (drvdata->post_delay_ms < 0) + return 0; + + msleep(drvdata->post_delay_ms); return 0; } @@ -116,6 +121,13 @@ static int gpio_reset_probe(struct platform_device *pdev) else if (drvdata->delay_us < 0) dev_warn(&pdev->dev, "reset delay too high\n"); + /* It is optional. + * Some devices need some milliseconds to wait after reset. + */ + ret = of_property_read_u32(np, "reset-post-delay-ms", &drvdata->post_delay_ms); + if (ret < 0) + drvdata->post_delay_ms = -1; + initially_in_reset = of_property_read_bool(np, "initially-in-reset"); if (drvdata->active_low ^ initially_in_reset) gpio_flags = GPIOF_OUT_INIT_HIGH; |