linux-kernel - [PATCH v3 7/8] reset: imx8mp-audiomix: Add support for DSP run/stall

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Message-ID: <20250225102005.408773-8-daniel.baluta@nxp.com>
Date: Tue, 25 Feb 2025 12:20:04 +0200
From: Daniel Baluta <daniel.baluta@....com>
To: p.zabel@...gutronix.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	shawnguo@...nel.org,
	mathieu.poirier@...aro.org
Cc: conor+dt@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-remoteproc@...r.kernel.org,
	andersson@...nel.org,
	Frank.Li@....com,
	peng.fan@....com,
	laurentiu.mihalcea@....com,
	iuliana.prodan@....com,
	Daniel Baluta <daniel.baluta@....com>
Subject: [PATCH v3 7/8] reset: imx8mp-audiomix: Add support for DSP run/stall

We can Run/Stall the DSP via audio block control bits found in audiomix.
Implement this functionality using the reset controller and use assert
for Stall and deassert for Run.

Signed-off-by: Daniel Baluta <daniel.baluta@....com>
Reviewed-by: Frank Li <Frank.Li@....com>
---
 drivers/reset/reset-imx8mp-audiomix.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
index 558da232ed8e..6e0bc477778c 100644
--- a/drivers/reset/reset-imx8mp-audiomix.c
+++ b/drivers/reset/reset-imx8mp-audiomix.c
@@ -17,6 +17,9 @@
 #define IMX8MP_AUDIOMIX_EARC_RESET_MASK		BIT(1)
 #define IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK	BIT(2)
 
+#define IMX8MP_AUDIOMIX_DSP_OFFSET		0x108
+#define IMX8MP_AUDIOMIX_DSP_RUNSTALL_MASK	BIT(5)
+
 struct imx8mp_reset_map {
 	unsigned int offset;
 	unsigned int mask;
@@ -34,6 +37,11 @@ static const struct imx8mp_reset_map reset_map[] = {
 		.mask	= IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK,
 		.active_low = true,
 	},
+	[IMX8MP_AUDIOMIX_DSP] = {
+		.offset	= IMX8MP_AUDIOMIX_DSP_OFFSET,
+		.mask	= IMX8MP_AUDIOMIX_DSP_RUNSTALL_MASK,
+		.active_low = false,
+	},
 };
 
 struct imx8mp_audiomix_reset {
-- 
2.43.0