linux-kernel - [PATCH 1/2] clocksource/drivers/imx-tpm: correct some registers operation flow

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Message-ID: <1522050461-19043-1-git-send-email-Anson.Huang@nxp.com>
Date:   Mon, 26 Mar 2018 15:47:40 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     <daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <aisheng.dong@....com>
CC:     <Linux-imx@....com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH 1/2] clocksource/drivers/imx-tpm: correct some registers operation flow

According to i.MX7ULP reference manual, TPM_SC_CPWMS can ONLY be
written when counter is disabled, TPM_SC_TOF is write-1-clear,
TPM_C0SC_CHF is also write-1-clear, correct these registers
initialization flow;

Replace incorret clock name igp with ipg.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt |  2 +-
 drivers/clocksource/timer-imx-tpm.c                       | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt b/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
index b4aa7dd..f82087b 100644
--- a/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
+++ b/Documentation/devicetree/bindings/timer/nxp,tpm-timer.txt
@@ -15,7 +15,7 @@ Required properties:
 - interrupts :	Should be the clock event device interrupt.
 - clocks :	The clocks provided by the SoC to drive the timer, must contain
 		an entry for each entry in clock-names.
-- clock-names : Must include the following entries: "igp" and "per".
+- clock-names : Must include the following entries: "ipg" and "per".
 
 Example:
 tpm5: tpm@...60000 {
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index 21bffdc..7403e49 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -20,6 +20,7 @@
 #define TPM_SC				0x10
 #define TPM_SC_CMOD_INC_PER_CNT		(0x1 << 3)
 #define TPM_SC_CMOD_DIV_DEFAULT		0x3
+#define TPM_SC_TOF_MASK			(0x1 << 7)
 #define TPM_CNT				0x14
 #define TPM_MOD				0x18
 #define TPM_STATUS			0x1c
@@ -29,6 +30,7 @@
 #define TPM_C0SC_MODE_SHIFT		2
 #define TPM_C0SC_MODE_MASK		0x3c
 #define TPM_C0SC_MODE_SW_COMPARE	0x4
+#define TPM_C0SC_CHF_MASK		(0x1 << 7)
 #define TPM_C0V				0x24
 
 static void __iomem *timer_base;
@@ -179,7 +181,7 @@ static int __init tpm_timer_init(struct device_node *np)
 	ipg = of_clk_get_by_name(np, "ipg");
 	per = of_clk_get_by_name(np, "per");
 	if (IS_ERR(ipg) || IS_ERR(per)) {
-		pr_err("tpm: failed to get igp or per clk\n");
+		pr_err("tpm: failed to get ipg or per clk\n");
 		ret = -ENODEV;
 		goto err_clk_get;
 	}
@@ -205,9 +207,13 @@ static int __init tpm_timer_init(struct device_node *np)
 	 * 4) Channel0 disabled
 	 * 5) DMA transfers disabled
 	 */
+	/* make sure counter is disabled */
 	writel(0, timer_base + TPM_SC);
+	/* TOF is W1C */
+	writel(TPM_SC_TOF_MASK, timer_base + TPM_SC);
 	writel(0, timer_base + TPM_CNT);
-	writel(0, timer_base + TPM_C0SC);
+	/* CHF is W1C */
+	writel(TPM_C0SC_CHF_MASK, timer_base + TPM_C0SC);
 
 	/* increase per cnt, div 8 by default */
 	writel(TPM_SC_CMOD_INC_PER_CNT | TPM_SC_CMOD_DIV_DEFAULT,
-- 
2.7.4