clk: qcom: Add display clock controller driver for QCM2290

Add support for the display clock controller found in QCM2290
based devices. This clock controller feeds the Multimedia Display
SubSystem (MDSS).

It's a porting of dispcc-scuba GPL-2.0 driver from CAF msm-4.19 kernel:
https://source.codeaurora.org/quic/la/kernel/msm-4.19/tree/drivers/clk/qcom/dispcc-scuba.c?h=LE.UM.4.4.1.r3

Global clock name references (parent_names) have been replaced by
parent_data and parent_hws.

Clocks marked enable_safe_config have their clk_rcg2_ops moved to
clk_rcg2_shared_ops.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1644432308-21099-2-git-send-email-loic.poulain@linaro.org

drivers/clk/qcom/Kconfig

@@ -340,6 +340,15 @@ config QCM_GCC_2290
 	  Say Y if you want to use multimedia devices or peripheral
 	  devices such as UART, SPI, I2C, USB, SD/eMMC etc.
 
+config QCM_DISPCC_2290
+	tristate "QCM2290 Display Clock Controller"
+	select QCM_GCC_2290
+	help
+	  Support for the display clock controller on Qualcomm Technologies, Inc
+	  QCM2290 devices.
+	  Say Y if you want to support display devices and functionality such as
+	  splash screen.
+
 config QCS_GCC_404
 	tristate "QCS404 Global Clock Controller"
 	help

drivers/clk/qcom/Makefile

@@ -56,6 +56,7 @@ obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
 obj-$(CONFIG_QCOM_CLK_RPMH) += clk-rpmh.o
 obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
 obj-$(CONFIG_QCM_GCC_2290) += gcc-qcm2290.o
+obj-$(CONFIG_QCM_DISPCC_2290) += dispcc-qcm2290.o
 obj-$(CONFIG_QCS_GCC_404) += gcc-qcs404.o
 obj-$(CONFIG_QCS_Q6SSTOP_404) += q6sstop-qcs404.o
 obj-$(CONFIG_QCS_TURING_404) += turingcc-qcs404.o