Kconfig: reduce the amount of power sequencing noise

Kconfig will ask the user twice about power sequencing: once for the QCom
WCN power sequencing driver and then again for the PCI power control
driver using it.

Let's automate the selection of PCI_PWRCTL by introducing a new hidden
symbol: HAVE_PWRCTL which should be selected by all platforms that have
the need to include PCI power control code (right now: only ARCH_QCOM).

The pwrseq-based PCI pwrctl driver itself will then be selected by the
drivers binding to devices that may require external handling of the
power-up sequence (currently: ath11k and ath12k) based on the value
of HAVE_PWRCTL.

Make all PCI pwrctl Kconfig symbols hidden so that no questions are
asked during configuration.

Fixes: 4565d26 ("PCI/pwrctl: Add PCI power control core code")
Reported-by: Linus Torvalds <[email protected]>
Closes: https://lore.kernel.org/lkml/CAHk-=wjWc5dzcj2O1tEgNHY1rnQW63JwtuZi_vAZPqy6wqpoUQ@mail.gmail.com/
Acked-by: Jeff Johnson <[email protected]> # drivers/net/wireless/ath
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: Bartosz Golaszewski

arch/arm64/Kconfig.platforms

@@ -267,6 +267,7 @@ config ARCH_QCOM
 	bool "Qualcomm Platforms"
 	select GPIOLIB
 	select PINCTRL
+	select HAVE_PWRCTL
 	help
 	  This enables support for the ARMv8 based Qualcomm chipsets.
 

drivers/net/wireless/ath/ath11k/Kconfig

@@ -24,6 +24,7 @@ config ATH11K_PCI
 	select MHI_BUS
 	select QRTR
 	select QRTR_MHI
+	select PCI_PWRCTL_PWRSEQ if HAVE_PWRCTL
 	help
 	  This module adds support for PCIE bus
 

drivers/net/wireless/ath/ath12k/Kconfig

@@ -7,6 +7,7 @@ config ATH12K
 	select MHI_BUS
 	select QRTR
 	select QRTR_MHI
+	select PCI_PWRCTL_PWRSEQ if HAVE_PWRCTL
 	help
 	  Enable support for Qualcomm Technologies Wi-Fi 7 (IEEE
 	  802.11be) family of chipsets, for example WCN7850 and

drivers/pci/pwrctl/Kconfig

@@ -1,17 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-menu "PCI Power control drivers"
+config HAVE_PWRCTL
+	bool
 
 config PCI_PWRCTL
 	tristate
 
 config PCI_PWRCTL_PWRSEQ
-	tristate "PCI Power Control driver using the Power Sequencing subsystem"
+	tristate
 	select POWER_SEQUENCING
 	select PCI_PWRCTL
-	default m if ((ATH11K_PCI || ATH12K) && ARCH_QCOM)
-	help
-	  Enable support for the PCI power control driver for device
-	  drivers using the Power Sequencing subsystem.
-
-endmenu