4.5-stable review patch. If anyone has any objections, please let me know.
------------------ From: Sudeep Holla <[email protected]> commit 2482bc31ca8096241b8fa97610ef23154ce55f45 upstream. The sti-cpufreq does unconditional registration of the cpufreq-dt driver which causes issue on an multi-platform build. For example, on Vexpress TC2 platform, we get the following error on boot: cpu cpu0: OPP-v2 not supported cpu cpu0: Not doing voltage scaling cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table for cpu:0, -19 cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6) ... arm_big_little: bL_cpufreq_register: Failed registering platform driver: vexpress-spc, err: -17 The actual driver fails to initialise as cpufreq-dt is probed successfully, which is incorrect. This issue can happen to any platform not using cpufreq-dt in a multi-platform build. This patch adds a check to do selective initialization of the driver. Fixes: ab0ea257fc58 (cpufreq: st: Provide runtime initialised driver for ST's platforms) Signed-off-by: Sudeep Holla <[email protected]> Acked-by: Viresh Kumar <[email protected]> Acked-by: Lee Jones <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/cpufreq/sti-cpufreq.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/cpufreq/sti-cpufreq.c +++ b/drivers/cpufreq/sti-cpufreq.c @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void) { int ret; + if ((!of_machine_is_compatible("st,stih407")) && + (!of_machine_is_compatible("st,stih410"))) + return -ENODEV; + ddata.cpu = get_cpu_device(0); if (!ddata.cpu) { dev_err(ddata.cpu, "Failed to get device for CPU0\n");
