| Message ID | 1359556069-16962-1-git-send-email-shawn.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 01/30/2013 08:27 AM, Shawn Guo wrote: > As multiplatform build is being adopted by more and more ARM platforms, > initcall function should be used very carefully. For example, when > GENERIC_CPUFREQ_CPU0 is built in the kernel, cpu0_cpufreq_driver_init() > will be called on all the platforms to initialize cpufreq-cpu0 driver. > > To eliminate this undesired the effect, the patch changes cpufreq-cpu0 > driver to have it instantiated as a platform_driver. Then it will only > run on platforms that create the platform_device "cpufreq-cpu0". > > Along with the change, it also changes cpu_dev to be &pdev->dev, > so that managed functions can start working, and module build gets > supported too. > > The highbank-cpufreq driver is also updated accordingly to adapt the > changes on cpufreq-cpu0. > > Signed-off-by: Shawn Guo <shawn.guo@linaro.org> > Cc: Mark Langsdorf <mark.langsdorf@calxeda.com> > Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> > --- Acked-by: Mark Langsdorf <mark.langsdorf@calxeda.com> --Mark Langsdorf Calxeda, Inc. > Changes since v2: > * Leave out omap2/am33xx bits to avoid conflicts with omap tree > > drivers/cpufreq/Kconfig | 2 +- > drivers/cpufreq/cpufreq-cpu0.c | 35 +++++++++++++++++++++++------------ > drivers/cpufreq/highbank-cpufreq.c | 5 +++++ > 3 files changed, 29 insertions(+), 13 deletions(-) > > diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig > index ea512f4..774dc1c 100644 > --- a/drivers/cpufreq/Kconfig > +++ b/drivers/cpufreq/Kconfig > @@ -180,7 +180,7 @@ config CPU_FREQ_GOV_CONSERVATIVE > If in doubt, say N. > > config GENERIC_CPUFREQ_CPU0 > - bool "Generic CPU0 cpufreq driver" > + tristate "Generic CPU0 cpufreq driver" > depends on HAVE_CLK && REGULATOR && PM_OPP && OF > select CPU_FREQ_TABLE > help > diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c > index 90e9d73..519c2f7 100644 > --- a/drivers/cpufreq/cpufreq-cpu0.c > +++ b/drivers/cpufreq/cpufreq-cpu0.c > @@ -12,12 +12,12 @@ > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > #include <linux/clk.h> > -#include <linux/cpu.h> > #include <linux/cpufreq.h> > #include <linux/err.h> > #include <linux/module.h> > #include <linux/of.h> > #include <linux/opp.h> > +#include <linux/platform_device.h> > #include <linux/regulator/consumer.h> > #include <linux/slab.h> > > @@ -174,7 +174,7 @@ static struct cpufreq_driver cpu0_cpufreq_driver = { > .attr = cpu0_cpufreq_attr, > }; > > -static int cpu0_cpufreq_driver_init(void) > +static int cpu0_cpufreq_probe(struct platform_device *pdev) > { > struct device_node *np; > int ret; > @@ -189,23 +189,17 @@ static int cpu0_cpufreq_driver_init(void) > return -ENOENT; > } > > - cpu_dev = get_cpu_device(0); > - if (!cpu_dev) { > - pr_err("failed to get cpu0 device\n"); > - ret = -ENODEV; > - goto out_put_node; > - } > - > + cpu_dev = &pdev->dev; > cpu_dev->of_node = np; > > - cpu_clk = clk_get(cpu_dev, NULL); > + cpu_clk = devm_clk_get(cpu_dev, NULL); > if (IS_ERR(cpu_clk)) { > ret = PTR_ERR(cpu_clk); > pr_err("failed to get cpu0 clock: %d\n", ret); > goto out_put_node; > } > > - cpu_reg = regulator_get(cpu_dev, "cpu0"); > + cpu_reg = devm_regulator_get(cpu_dev, "cpu0"); > if (IS_ERR(cpu_reg)) { > pr_warn("failed to get cpu0 regulator\n"); > cpu_reg = NULL; > @@ -266,7 +260,24 @@ out_put_node: > of_node_put(np); > return ret; > } > -late_initcall(cpu0_cpufreq_driver_init); > + > +static int cpu0_cpufreq_remove(struct platform_device *pdev) > +{ > + cpufreq_unregister_driver(&cpu0_cpufreq_driver); > + opp_free_cpufreq_table(cpu_dev, &freq_table); > + > + return 0; > +} > + > +static struct platform_driver cpu0_cpufreq_platdrv = { > + .driver = { > + .name = "cpufreq-cpu0", > + .owner = THIS_MODULE, > + }, > + .probe = cpu0_cpufreq_probe, > + .remove = cpu0_cpufreq_remove, > +}; > +module_platform_driver(cpu0_cpufreq_platdrv); > > MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); > MODULE_DESCRIPTION("Generic CPU0 cpufreq driver"); > diff --git a/drivers/cpufreq/highbank-cpufreq.c b/drivers/cpufreq/highbank-cpufreq.c > index 2ea6276..0491f1f 100644 > --- a/drivers/cpufreq/highbank-cpufreq.c > +++ b/drivers/cpufreq/highbank-cpufreq.c > @@ -20,6 +20,7 @@ > #include <linux/err.h> > #include <linux/of.h> > #include <linux/mailbox.h> > +#include <linux/platform_device.h> > > #define HB_CPUFREQ_CHANGE_NOTE 0x80000001 > #define HB_CPUFREQ_IPC_LEN 7 > @@ -65,6 +66,7 @@ static struct notifier_block hb_cpufreq_clk_nb = { > > static int hb_cpufreq_driver_init(void) > { > + struct platform_device_info devinfo = { .name = "cpufreq-cpu0", }; > struct device *cpu_dev; > struct clk *cpu_clk; > struct device_node *np; > @@ -104,6 +106,9 @@ static int hb_cpufreq_driver_init(void) > goto out_put_node; > } > > + /* Instantiate cpufreq-cpu0 */ > + platform_device_register_full(&devinfo); > + > out_put_node: > of_node_put(np); > return ret; >
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index ea512f4..774dc1c 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -180,7 +180,7 @@ config CPU_FREQ_GOV_CONSERVATIVE If in doubt, say N. config GENERIC_CPUFREQ_CPU0 - bool "Generic CPU0 cpufreq driver" + tristate "Generic CPU0 cpufreq driver" depends on HAVE_CLK && REGULATOR && PM_OPP && OF select CPU_FREQ_TABLE help diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c index 90e9d73..519c2f7 100644 --- a/drivers/cpufreq/cpufreq-cpu0.c +++ b/drivers/cpufreq/cpufreq-cpu0.c @@ -12,12 +12,12 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/clk.h> -#include <linux/cpu.h> #include <linux/cpufreq.h> #include <linux/err.h> #include <linux/module.h> #include <linux/of.h> #include <linux/opp.h> +#include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> @@ -174,7 +174,7 @@ static struct cpufreq_driver cpu0_cpufreq_driver = { .attr = cpu0_cpufreq_attr, }; -static int cpu0_cpufreq_driver_init(void) +static int cpu0_cpufreq_probe(struct platform_device *pdev) { struct device_node *np; int ret; @@ -189,23 +189,17 @@ static int cpu0_cpufreq_driver_init(void) return -ENOENT; } - cpu_dev = get_cpu_device(0); - if (!cpu_dev) { - pr_err("failed to get cpu0 device\n"); - ret = -ENODEV; - goto out_put_node; - } - + cpu_dev = &pdev->dev; cpu_dev->of_node = np; - cpu_clk = clk_get(cpu_dev, NULL); + cpu_clk = devm_clk_get(cpu_dev, NULL); if (IS_ERR(cpu_clk)) { ret = PTR_ERR(cpu_clk); pr_err("failed to get cpu0 clock: %d\n", ret); goto out_put_node; } - cpu_reg = regulator_get(cpu_dev, "cpu0"); + cpu_reg = devm_regulator_get(cpu_dev, "cpu0"); if (IS_ERR(cpu_reg)) { pr_warn("failed to get cpu0 regulator\n"); cpu_reg = NULL; @@ -266,7 +260,24 @@ out_put_node: of_node_put(np); return ret; } -late_initcall(cpu0_cpufreq_driver_init); + +static int cpu0_cpufreq_remove(struct platform_device *pdev) +{ + cpufreq_unregister_driver(&cpu0_cpufreq_driver); + opp_free_cpufreq_table(cpu_dev, &freq_table); + + return 0; +} + +static struct platform_driver cpu0_cpufreq_platdrv = { + .driver = { + .name = "cpufreq-cpu0", + .owner = THIS_MODULE, + }, + .probe = cpu0_cpufreq_probe, + .remove = cpu0_cpufreq_remove, +}; +module_platform_driver(cpu0_cpufreq_platdrv); MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); MODULE_DESCRIPTION("Generic CPU0 cpufreq driver"); diff --git a/drivers/cpufreq/highbank-cpufreq.c b/drivers/cpufreq/highbank-cpufreq.c index 2ea6276..0491f1f 100644 --- a/drivers/cpufreq/highbank-cpufreq.c +++ b/drivers/cpufreq/highbank-cpufreq.c @@ -20,6 +20,7 @@ #include <linux/err.h> #include <linux/of.h> #include <linux/mailbox.h> +#include <linux/platform_device.h> #define HB_CPUFREQ_CHANGE_NOTE 0x80000001 #define HB_CPUFREQ_IPC_LEN 7 @@ -65,6 +66,7 @@ static struct notifier_block hb_cpufreq_clk_nb = { static int hb_cpufreq_driver_init(void) { + struct platform_device_info devinfo = { .name = "cpufreq-cpu0", }; struct device *cpu_dev; struct clk *cpu_clk; struct device_node *np; @@ -104,6 +106,9 @@ static int hb_cpufreq_driver_init(void) goto out_put_node; } + /* Instantiate cpufreq-cpu0 */ + platform_device_register_full(&devinfo); + out_put_node: of_node_put(np); return ret;