regulator: fixed: add off-on-delay

Depends on board design, the gpio controlling regulator may
connects with a big capacitance. When need off, it takes some time
to let the regulator to be truly off. If not add enough delay, the
regulator might have always been on, so introduce off-on-delay to
handle such case.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/1572311875-22880-3-git-send-email-peng.fan@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index f81533070058e29db66991311ec4bbbec0c32636..bc0bbd99e98d0471b5ce176309d6b8caec28e3a0 100644 (file)
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -123,6 +123,7 @@ of_get_fixed_voltage_config(struct device *dev,
                config->enabled_at_boot = true;
 
        of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
+       of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay);
 
        if (of_find_property(np, "vin-supply", NULL))
                config->input_supply = "vin";
@@ -189,6 +190,7 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
        }
 
        drvdata->desc.enable_time = config->startup_delay;
+       drvdata->desc.off_on_delay = config->off_on_delay;
 
        if (config->input_supply) {
                drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,

diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index d44ce5f18a568a450267215447c4b8e5a8b79ee1..55319943fcc58e9be7def5b921a6628041e10684 100644 (file)
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -36,6 +36,7 @@ struct fixed_voltage_config {
        const char *input_supply;
        int microvolts;
        unsigned startup_delay;
+       unsigned int off_on_delay;
        unsigned enabled_at_boot:1;
        struct regulator_init_data *init_data;
 };