linux-kernel - [PATCH] pwm: imx-tpm: reset module on probe

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Date: Thu,  1 Feb 2024 14:22:42 +0200
From: "Viorel Suman (OSS)" <viorel.suman@....nxp.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	linux-pwm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Viorel Suman <viorel.suman@....nxp.com>,
	Viorel Suman <viorel.suman@....com>
Subject: [PATCH] pwm: imx-tpm: reset module on probe

From: Viorel Suman <viorel.suman@....com>

Reset Timer PWM module on probe so that the module
takes the default state after probe is finished.

Signed-off-by: Viorel Suman <viorel.suman@....com>
Signed-off-by: Florin Leotescu <florin.leotescu@....com>
---
 drivers/pwm/pwm-imx-tpm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c
index 9fc290e647e1..27e6a5342693 100644
--- a/drivers/pwm/pwm-imx-tpm.c
+++ b/drivers/pwm/pwm-imx-tpm.c
@@ -33,6 +33,7 @@
 #define PWM_IMX_TPM_CnV(n)	(0x24 + (n) * 0x8)
 
 #define PWM_IMX_TPM_PARAM_CHAN			GENMASK(7, 0)
+#define PWM_IMX_TPM_GLOBAL_RST			BIT(1)
 
 #define PWM_IMX_TPM_SC_PS			GENMASK(2, 0)
 #define PWM_IMX_TPM_SC_CMOD			GENMASK(4, 3)
@@ -362,6 +363,10 @@ static int pwm_imx_tpm_probe(struct platform_device *pdev)
 	val = readl(tpm->base + PWM_IMX_TPM_PARAM);
 	tpm->chip.npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val);
 
+	/* Resets all internal logic and registers */
+	writel(PWM_IMX_TPM_GLOBAL_RST, tpm->base + PWM_IMX_TPM_GLOBAL);
+	writel(0, tpm->base + PWM_IMX_TPM_GLOBAL);
+
 	mutex_init(&tpm->lock);
 
 	ret = devm_pwmchip_add(&pdev->dev, &tpm->chip);
-- 
2.34.1