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Message-ID: <1561687972-19319-16-git-send-email-skomatineni@nvidia.com>
Date: Thu, 27 Jun 2019 19:12:49 -0700
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.com>,
<tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <linus.walleij@...aro.org>,
<stefan@...er.ch>, <mark.rutland@....com>
CC: <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
<sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
<josephl@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
<digetx@...il.com>, <devicetree@...r.kernel.org>
Subject: [PATCH V5 15/18] soc/tegra: pmc: Configure core power request polarity
This patch configures polarity of the core power request signal
in PMC control register based on the device tree property.
PMC asserts and de-asserts power request signal based on it polarity
when it need to power-up and power-down the core rail during SC7.
Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
drivers/soc/tegra/pmc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 194100d77243..ed83c0cd09a3 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -56,6 +56,7 @@
#define PMC_CNTRL_SIDE_EFFECT_LP0 BIT(14) /* LP0 when CPU pwr gated */
#define PMC_CNTRL_SYSCLK_OE BIT(11) /* system clock enable */
#define PMC_CNTRL_SYSCLK_POLARITY BIT(10) /* sys clk polarity */
+#define PMC_CNTRL_PWRREQ_POLARITY BIT(8)
#define PMC_CNTRL_MAIN_RST BIT(4)
#define PMC_CNTRL_LATCH_WAKEUPS BIT(5)
@@ -2303,6 +2304,11 @@ static void tegra20_pmc_init(struct tegra_pmc *pmc)
else
value |= PMC_CNTRL_SYSCLK_POLARITY;
+ if (pmc->corereq_high)
+ value &= ~PMC_CNTRL_PWRREQ_POLARITY;
+ else
+ value |= PMC_CNTRL_PWRREQ_POLARITY;
+
/* configure the output polarity while the request is tristated */
tegra_pmc_writel(pmc, value, PMC_CNTRL);
--
2.7.4
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