lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1431618155-3132-5-git-send-email-sudeep.holla@arm.com>
Date:	Thu, 14 May 2015 16:42:34 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH v2 4/5] clk: scpi: add support for cpufreq virtual device

The clocks for the CPUs are provided by SCP and are managed by this
clock driver. So the cpufreq device needs to be added only after the
clock get registered and removed when this driver is unloaded.

This patch manages the cpufreq virtual device based on the clock
availability.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Cc: Mike Turquette <mturquette@...aro.org>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Liviu Dudau <Liviu.Dudau@....com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Jon Medhurst (Tixy) <tixy@...aro.org>
Cc: linux-clk@...r.kernel.org
---
 drivers/clk/clk-scpi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/clk/clk-scpi.c b/drivers/clk/clk-scpi.c
index 208f68d14214..092b4231b1de 100644
--- a/drivers/clk/clk-scpi.c
+++ b/drivers/clk/clk-scpi.c
@@ -37,6 +37,7 @@ struct scpi_clk {
 #define to_scpi_clk(clk) container_of(clk, struct scpi_clk, hw)
 
 static struct scpi_ops *scpi_ops;
+static struct platform_device *cpufreq_dev;
 
 static unsigned long scpi_clk_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
@@ -247,6 +248,11 @@ static int scpi_clocks_remove(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *child, *np = dev->of_node;
 
+	if (cpufreq_dev) {
+		platform_device_unregister(cpufreq_dev);
+		cpufreq_dev = NULL;
+	}
+
 	for_each_available_child_of_node(np, child)
 		of_clk_del_provider(np);
 	scpi_ops = NULL;
@@ -270,6 +276,12 @@ static int scpi_clocks_probe(struct platform_device *pdev)
 			return ret;
 		}
 	}
+	/* Add the virtual cpufreq device */
+	cpufreq_dev = platform_device_register_simple("scpi-cpufreq",
+						      -1, NULL, 0);
+	if (!cpufreq_dev)
+		pr_warn("unable to register cpufreq device");
+
 	return 0;
 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ