linux-kernel - [PATCH] firmware: arm_scmi: add clock management to the SCMI power domain

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Message-ID: <5q88n947-pon-4940-3or6-s54o4r361o5s@onlyvoer.pbz>
Date:   Fri, 7 May 2021 16:20:36 -0400 (EDT)
From:   Nicolas Pitre <npitre@...libre.com>
To:     Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>
cc:     Dien Pham <dien.pham.ry@...esas.com>,
        Gaku Inami <gaku.inami.xh@...esas.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] firmware: arm_scmi: add clock management to the SCMI power
 domain

Clocks requiring non-atomic contexts are supported by the generic clock
PM layer since commit 0bfa0820c274 ("PM: clk: make PM clock layer
compatible with clocks that must sleep"). That means we can have
SCMI-based clocks be managed by the SCMI power domain now.

Signed-off-by: Nicolas Pitre <npitre@...libre.com>
Tested-by: Dien Pham <dien.pham.ry@...esas.com>
Reviewed-by: Gaku Inami <gaku.inami.xh@...esas.com>

diff --git a/drivers/firmware/arm_scmi/scmi_pm_domain.c b/drivers/firmware/arm_scmi/scmi_pm_domain.c
index 9d36d5c062..4371fdcd5a 100644
--- a/drivers/firmware/arm_scmi/scmi_pm_domain.c
+++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c
@@ -8,6 +8,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/pm_clock.h>
 #include <linux/pm_domain.h>
 #include <linux/scmi_protocol.h>
 
@@ -52,6 +53,27 @@ static int scmi_pd_power_off(struct generic_pm_domain *domain)
 	return scmi_pd_power(domain, false);
 }
 
+static int scmi_pd_attach_dev(struct generic_pm_domain *pd, struct device *dev)
+{
+	int ret;
+
+	ret = pm_clk_create(dev);
+	if (ret)
+		return ret;
+
+	ret = of_pm_clk_add_clks(dev);
+	if (ret >= 0)
+		return 0;
+
+	pm_clk_destroy(dev);
+	return ret;
+}
+
+static void scmi_pd_detach_dev(struct generic_pm_domain *pd, struct device *dev)
+{
+	pm_clk_destroy(dev);
+}
+
 static int scmi_pm_domain_probe(struct scmi_device *sdev)
 {
 	int num_domains, i;
@@ -102,6 +124,10 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev)
 		scmi_pd->genpd.name = scmi_pd->name;
 		scmi_pd->genpd.power_off = scmi_pd_power_off;
 		scmi_pd->genpd.power_on = scmi_pd_power_on;
+		scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;
+		scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;
+		scmi_pd->genpd.flags = GENPD_FLAG_PM_CLK |
+				       GENPD_FLAG_ACTIVE_WAKEUP;
 
 		pm_genpd_init(&scmi_pd->genpd, NULL,
 			      state == SCMI_POWER_STATE_GENERIC_OFF);