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115 lines
3.6 KiB
Diff
115 lines
3.6 KiB
Diff
From edeec420de2407618de097977e76b572d9de1bcf Mon Sep 17 00:00:00 2001
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From: Viresh Kumar <viresh.kumar@linaro.org>
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Date: Wed, 16 Aug 2017 11:07:27 +0530
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Subject: cpufreq: dt-platdev: Automatically create cpufreq device with OPP v2
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The initial idea of creating the cpufreq-dt-platdev.c file was to keep a
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list of platforms that use the "operating-points" (V1) bindings and
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create cpufreq device for them only, as we weren't sure which platforms
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would want the device to get created automatically as some had their own
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cpufreq drivers as well, or wanted to initialize cpufreq after doing
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some stuff from platform code.
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But that wasn't the case with platforms using "operating-points-v2"
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property. We wanted the device to get created automatically without the
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need of adding them to the whitelist. Though, we will still have some
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exceptions where we don't want to create the device automatically.
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Rename the earlier platform list as *whitelist* and create a new
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*blacklist* as well.
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The cpufreq-dt device will get created if:
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- The platform is there in the whitelist OR
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- The platform has "operating-points-v2" property in CPU0's DT node and
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isn't part of the blacklist .
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Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
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Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Tested-by: Simon Horman <horms+renesas@verge.net.au>
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Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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---
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drivers/cpufreq/cpufreq-dt-platdev.c | 45 ++++++++++++++++++++++++++++++++----
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1 file changed, 40 insertions(+), 5 deletions(-)
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diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
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index 8b88768..7c67a6c 100644
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--- a/drivers/cpufreq/cpufreq-dt-platdev.c
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+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
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@@ -9,11 +9,16 @@
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#include <linux/err.h>
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#include <linux/of.h>
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+#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include "cpufreq-dt.h"
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-static const struct of_device_id machines[] __initconst = {
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+/*
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+ * Machines for which the cpufreq device is *always* created, mostly used for
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+ * platforms using "operating-points" (V1) property.
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+ */
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+static const struct of_device_id whitelist[] __initconst = {
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{ .compatible = "allwinner,sun4i-a10", },
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{ .compatible = "allwinner,sun5i-a10s", },
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{ .compatible = "allwinner,sun5i-a13", },
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@@ -107,21 +112,51 @@ static const struct of_device_id machines[] __initconst = {
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{ }
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};
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+/*
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+ * Machines for which the cpufreq device is *not* created, mostly used for
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+ * platforms using "operating-points-v2" property.
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+ */
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+static const struct of_device_id blacklist[] __initconst = {
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+ { }
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+};
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+
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+static bool __init cpu0_node_has_opp_v2_prop(void)
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+{
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+ struct device_node *np = of_cpu_device_node_get(0);
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+ bool ret = false;
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+
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+ if (of_get_property(np, "operating-points-v2", NULL))
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+ ret = true;
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+
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+ of_node_put(np);
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+ return ret;
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+}
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+
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static int __init cpufreq_dt_platdev_init(void)
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{
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struct device_node *np = of_find_node_by_path("/");
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const struct of_device_id *match;
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+ const void *data = NULL;
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if (!np)
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return -ENODEV;
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- match = of_match_node(machines, np);
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+ match = of_match_node(whitelist, np);
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+ if (match) {
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+ data = match->data;
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+ goto create_pdev;
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+ }
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+
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+ if (cpu0_node_has_opp_v2_prop() && !of_match_node(blacklist, np))
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+ goto create_pdev;
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+
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of_node_put(np);
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- if (!match)
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- return -ENODEV;
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+ return -ENODEV;
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+create_pdev:
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+ of_node_put(np);
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return PTR_ERR_OR_ZERO(platform_device_register_data(NULL, "cpufreq-dt",
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- -1, match->data,
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+ -1, data,
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sizeof(struct cpufreq_dt_platform_data)));
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}
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device_initcall(cpufreq_dt_platdev_init);
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--
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cgit v1.1
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