Add bridged amplifiers to cs42l43

Merge series from Charles Keepax <ckeepax@opensource.cirrus.com>:

In some cs42l43 systems a couple of cs35l56 amplifiers are attached
to the cs42l43's SPI and I2S. On Windows the cs42l43 is controlled
by a SDCA class driver and these two amplifiers are controlled by
firmware running on the cs42l43. However, under Linux the decision
was made to interact with the cs42l43 directly, affording the user
greater control over the audio system. However, this has resulted
in an issue where these two bridged cs35l56 amplifiers are not
populated in ACPI and must be added manually. There is at least an
SDCA extension unit DT entry we can key off.

The process of adding this is handled using a software node, firstly the
ability to add native chip selects to software nodes must be added.
Secondly, an additional flag for naming the SPI devices is added this
allows the machine driver to key to the correct amplifier. Then finally,
the cs42l43 SPI driver adds the two amplifiers directly onto its SPI
bus.

An additional series will follow soon to add the audio machine driver
parts (in the sof-sdw driver), however that is fairly orthogonal to
this part of the process, getting the actual amplifiers registered.

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 4cadfd606e8e6..7f0732bc0ccd2 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -65,6 +65,7 @@ static int __init parse_no_stealacc(char *arg)
 
 early_param("no-steal-acc", parse_no_stealacc);
 
+static DEFINE_PER_CPU_READ_MOSTLY(bool, async_pf_enabled);
 static DEFINE_PER_CPU_DECRYPTED(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);
 DEFINE_PER_CPU_DECRYPTED(struct kvm_steal_time, steal_time) __aligned(64) __visible;
 static int has_steal_clock = 0;
@@ -244,7 +245,7 @@ noinstr u32 kvm_read_and_reset_apf_flags(void)
 {
 	u32 flags = 0;
 
-	if (__this_cpu_read(apf_reason.enabled)) {
+	if (__this_cpu_read(async_pf_enabled)) {
 		flags = __this_cpu_read(apf_reason.flags);
 		__this_cpu_write(apf_reason.flags, 0);
 	}
@@ -295,7 +296,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_asyncpf_interrupt)
 
 	inc_irq_stat(irq_hv_callback_count);
 
-	if (__this_cpu_read(apf_reason.enabled)) {
+	if (__this_cpu_read(async_pf_enabled)) {
 		token = __this_cpu_read(apf_reason.token);
 		kvm_async_pf_task_wake(token);
 		__this_cpu_write(apf_reason.token, 0);
@@ -362,7 +363,7 @@ static void kvm_guest_cpu_init(void)
 		wrmsrl(MSR_KVM_ASYNC_PF_INT, HYPERVISOR_CALLBACK_VECTOR);
 
 		wrmsrl(MSR_KVM_ASYNC_PF_EN, pa);
-		__this_cpu_write(apf_reason.enabled, 1);
+		__this_cpu_write(async_pf_enabled, true);
 		pr_debug("setup async PF for cpu %d\n", smp_processor_id());
 	}
 
@@ -383,11 +384,11 @@ static void kvm_guest_cpu_init(void)
 
 static void kvm_pv_disable_apf(void)
 {
-	if (!__this_cpu_read(apf_reason.enabled))
+	if (!__this_cpu_read(async_pf_enabled))
 		return;
 
 	wrmsrl(MSR_KVM_ASYNC_PF_EN, 0);
-	__this_cpu_write(apf_reason.enabled, 0);
+	__this_cpu_write(async_pf_enabled, false);
 
 	pr_debug("disable async PF for cpu %d\n", smp_processor_id());
 }