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[v3,2/7] pinctrl: samsung: Ensure that pad retention is disabled on driver init

Message ID 1485779908-32147-3-git-send-email-m.szyprowski@samsung.com
State Accepted
Commit 8fe9bf074268323353c4e44d6fdfff10204e14ba
Headers show
Series Pad retentions support for Exynos5433 | expand

Commit Message

Marek Szyprowski Jan. 30, 2017, 12:38 p.m. UTC
When pin controller device is a part of power domain, there is no guarantee
that the power domain was not turned off and then on during boot process
before probing of the pin control driver. If it happened, then pin control
driver should ensure that pad retention is turned off during its probe call.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>

 drivers/pinctrl/samsung/pinctrl-exynos.c | 5 +++++
 1 file changed, 5 insertions(+)


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diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index 63e51b56a22a..fa3802970570 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.c
@@ -777,6 +777,7 @@  static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
 	struct samsung_retention_ctrl *ctrl;
 	struct regmap *pmu_regs;
+	int i;
 	ctrl = devm_kzalloc(drvdata->dev, sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl)
@@ -794,6 +795,10 @@  static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
 	ctrl->enable = exynos_retention_enable;
 	ctrl->disable = exynos_retention_disable;
+	/* Ensure that retention is disabled on driver init */
+	for (i = 0; i < ctrl->nr_regs; i++)
+		regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
 	return ctrl;