From 26e6aaafc8a1e862437003d6e06ba748e7177ea8 Mon Sep 17 00:00:00 2001 From: Rhyland Klein Date: Thu, 7 Apr 2016 17:37:08 -0400 Subject: pinctrl: tegra: clear park bit for all pins Parking bits might not be cleared by the bootloader properly (if for instance it doesn't use the device configured by that pin). Clear the park bits for all the pins during pinctrl probe. This is present on T210 platforms but not earlier ones, so for earlier generations, set parked_reg = -1 to disable. The park bit is used to prevent glitching when reprogramming pinctrl registers. Based on work by: Shravani Dingari Signed-off-by: Rhyland Klein Acked-by: Stephen Warren Signed-off-by: Linus Walleij --- drivers/pinctrl/tegra/pinctrl-tegra.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/pinctrl/tegra/pinctrl-tegra.c') diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c index 3f7fce9075ab..053d62016e5a 100644 --- a/drivers/pinctrl/tegra/pinctrl-tegra.c +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c @@ -625,6 +625,22 @@ static struct pinctrl_desc tegra_pinctrl_desc = { .owner = THIS_MODULE, }; +static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx) +{ + int i = 0; + const struct tegra_pingroup *g; + u32 val; + + for (i = 0; i < pmx->soc->ngroups; ++i) { + if (pmx->soc->groups[i].parked_reg >= 0) { + g = &pmx->soc->groups[i]; + val = pmx_readl(pmx, g->parked_bank, g->parked_reg); + val &= ~(1 << g->parked_bit); + pmx_writel(pmx, val, g->parked_bank, g->parked_reg); + } + } +} + static bool gpio_node_has_range(void) { struct device_node *np; @@ -725,6 +741,8 @@ int tegra_pinctrl_probe(struct platform_device *pdev, return PTR_ERR(pmx->pctl); } + tegra_pinctrl_clear_parked_bits(pmx); + if (!gpio_node_has_range()) pinctrl_add_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range); -- cgit