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authorMichael Srba <Michael.Srba@seznam.cz>2022-04-11 10:21:55 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2022-04-19 21:03:57 +0300
commit97d485edc1d9902c9ae3b2242144abdf85edd4c1 (patch)
tree19acfa42005fdd6f808bafce853367017290d2b1 /drivers/bus/Kconfig
parent0b9fe9b7792f31674fbc8eb165c3b22a32d0a434 (diff)
downloadlinux-97d485edc1d9902c9ae3b2242144abdf85edd4c1.tar.xz
bus: add driver for initializing the SSC bus on (some) qcom SoCs
Add bindings for the AHB bus which exposes the SSC (Snapdragon Sensor Core) block in the global address space. This bus (and the SSC block itself) is present on certain qcom SoCs. In typical configuration, this bus (as some of the clocks and registers that we need to manipulate) is not accessible to Linux, and the resources on this bus are indirectly accessed by communicating with a hexagon CPU core residing in the SSC block. In this configuration, the hypervisor is the one performing the bus initialization for the purposes of bringing the hexagon CPU core out of reset. However, it is possible to change the configuration, in which case this driver will initialize the bus. In combination with drivers for resources on the SSC bus, this driver can aid in debugging, and for example with a TLMM driver can be used to directly access SSC-dedicated GPIO pins, removing the need to commit to a particular usecase during hw design. Finally, until open firmware for the hexagon core is available, this approach allows for using sensors hooked up to SSC-dedicated GPIO pins on mainline Linux simply by utilizing the existing in-tree drivers for these sensors. Signed-off-by: Michael Srba <Michael.Srba@seznam.cz> Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20220411072156.24451-5-michael.srba@seznam.cz
Diffstat (limited to 'drivers/bus/Kconfig')
-rw-r--r--drivers/bus/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 3c68e174a113..7bfe998f3514 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -152,6 +152,17 @@ config QCOM_EBI2
Interface 2, which can be used to connect things like NAND Flash,
SRAM, ethernet adapters, FPGAs and LCD displays.
+config QCOM_SSC_BLOCK_BUS
+ bool "Qualcomm SSC Block Bus Init Driver"
+ depends on ARCH_QCOM
+ help
+ Say y here to enable support for initializing the bus that connects
+ the SSC block's internal bus to the cNoC (configurantion NoC) on
+ (some) qcom SoCs.
+ The SSC (Snapdragon Sensor Core) block contains a gpio controller,
+ i2c/spi/uart controllers, a hexagon core, and a clock controller
+ which provides clocks for the above.
+
config SUN50I_DE2_BUS
bool "Allwinner A64 DE2 Bus Driver"
default ARM64