linux-kernel - [PATCH 6/9] soc: ti: omap-prm: Add pm

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Message-Id: <20201026111049.54835-7-tony@atomide.com>
Date:   Mon, 26 Oct 2020 13:10:46 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     "Andrew F . Davis" <afd@...com>, Dave Gerlach <d-gerlach@...com>,
        Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        linux-remoteproc@...r.kernel.org
Subject: [PATCH 6/9] soc: ti: omap-prm: Add pm_clk for genpd

In order to probe l3 and l4 interconnects with simple-pm-bus, we want
genpd to manage the clocks for the interconnects. For interconnect target
modules, we already have ti-sysc manage the clocks so let's skipe managing
clocks for ti-sysc modules.

Cc: Santosh Shilimkar <ssantosh@...nel.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/soc/ti/omap_prm.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c
--- a/drivers/soc/ti/omap_prm.c
+++ b/drivers/soc/ti/omap_prm.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -14,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_clock.h>
 #include <linux/pm_domain.h>
 #include <linux/reset-controller.h>
 #include <linux/delay.h>
@@ -325,6 +327,35 @@ static int omap_prm_domain_power_off(struct generic_pm_domain *domain)
 	return 0;
 }
 
+/*
+ * Note that ti-sysc already manages the module clocks separately so
+ * no need to manage those. Interconnect instances need clocks managed
+ * for simple-pm-bus.
+ */
+static int omap_prm_domain_attach_clock(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	int error;
+
+	if (of_device_is_compatible(np, "ti-sysc"))
+		return 0;
+
+	if (!of_property_read_bool(np, "clocks"))
+		return 0;
+
+	error = pm_clk_create(dev);
+	if (error)
+		return error;
+
+	error = of_pm_clk_add_clks(dev);
+	if (error < 0) {
+		pm_clk_destroy(dev);
+		return error;
+	}
+
+	return 0;
+}
+
 static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
 				      struct device *dev)
 {
@@ -349,6 +380,10 @@ static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
 	genpd_data = dev_gpd_data(dev);
 	genpd_data->data = NULL;
 
+	ret = omap_prm_domain_attach_clock(dev);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -357,6 +392,7 @@ static void omap_prm_domain_detach_dev(struct generic_pm_domain *domain,
 {
 	struct generic_pm_domain_data *genpd_data;
 
+	pm_clk_destroy(dev);
 	genpd_data = dev_gpd_data(dev);
 	genpd_data->data = NULL;
 }
@@ -393,6 +429,7 @@ static int omap_prm_domain_init(struct device *dev, struct omap_prm *prm)
 	prmd->pd.power_off = omap_prm_domain_power_off;
 	prmd->pd.attach_dev = omap_prm_domain_attach_dev;
 	prmd->pd.detach_dev = omap_prm_domain_detach_dev;
+	prmd->pd.flags = GENPD_FLAG_PM_CLK;
 
 	pm_genpd_init(&prmd->pd, NULL, true);
 	error = of_genpd_add_provider_simple(np, &prmd->pd);
-- 
2.29.1