linux-kernel - [PATCH v1 6/7] soc: imx: gpcv2: add quirks to domains

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Date:   Wed,  7 Apr 2021 23:21:21 +0200
From:   Adrien Grassein <adrien.grassein@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     robh+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        l.stach@...gutronix.de, Anson.Huang@....com, krzk@...nel.org,
        peng.fan@....com, aisheng.dong@....com, qiangqing.zhang@....com,
        alice.guo@....com, aford173@...il.com, agx@...xcpu.org,
        andrew.smirnov@...il.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Adrien Grassein <adrien.grassein@...il.com>
Subject: [PATCH v1 6/7] soc: imx: gpcv2: add quirks to domains

Some domains need quirks during their operation.
For example, on i.MX8MM, USB domains should not be powered off.

Signed-off-by: Adrien Grassein <adrien.grassein@...il.com>
---
 drivers/soc/imx/gpcv2.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 571d0381dd87..592b9808dcd4 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -119,6 +119,10 @@
 
 #define GPC_CLK_MAX		6
 
+/* Quirks */
+//Refuse to poweroff the domain
+#define GPC_QUIRKS_DONT_POWEROFF BIT(0)
+
 static DEFINE_MUTEX(gpc_pd_mutex);
 
 struct imx_pgc_domain {
@@ -139,6 +143,7 @@ struct imx_pgc_domain {
 
 	const int voltage;
 	struct device *dev;
+	const unsigned int quirks;
 };
 
 struct imx_pgc_domain_data {
@@ -263,6 +268,9 @@ static int imx_gpc_pu_pgc_sw_pdn_req(struct generic_pm_domain *genpd)
 	int i, ret = 0;
 	u32 value;
 
+	if (domain->quirks & GPC_QUIRKS_DONT_POWEROFF)
+		return 0;
+
 	mutex_lock(&gpc_pd_mutex);
 
 	/* Enable reset clocks for all devices in the domain */
@@ -606,6 +614,7 @@ static const struct imx_pgc_domain imx8mm_pgc_domains[] = {
 			.map = IMX8MM_OTG1_A53_DOMAIN,
 		},
 		.pgc        = IMX8MM_PGC_OTG1,
+		.quirks     = GPC_QUIRKS_DONT_POWEROFF,
 	},
 
 	[IMX8MM_POWER_DOMAIN_USB_OTG2] = {
@@ -617,6 +626,7 @@ static const struct imx_pgc_domain imx8mm_pgc_domains[] = {
 			.map = IMX8MM_OTG2_A53_DOMAIN,
 		},
 		.pgc        = IMX8MM_PGC_OTG2,
+		.quirks     = GPC_QUIRKS_DONT_POWEROFF,
 	},
 };
 
-- 
2.25.1