clk: mmp: pxa1908: Instantiate power driver through auxiliary bus

The power domain driver shares the APMU clock controller's registers.
Instantiate the power domain driver through the APMU clock driver using
the auxiliary bus.

Also create a separate Kconfig entry for the PXA1908 clock driver to
allow (de)selecting the driver at will and selecting
CONFIG_AUXILIARY_BUS.

Signed-off-by: Duje Mihanović <duje@dujemihanovic.xyz>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

4 files changed, 22 insertions, 1 deletions

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 4d56475f94fc..68a9641fc649 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -511,6 +511,7 @@ source "drivers/clk/imx/Kconfig"
 source "drivers/clk/ingenic/Kconfig"
 source "drivers/clk/keystone/Kconfig"
 source "drivers/clk/mediatek/Kconfig"
+source "drivers/clk/mmp/Kconfig"
 source "drivers/clk/meson/Kconfig"
 source "drivers/clk/mstar/Kconfig"
 source "drivers/clk/microchip/Kconfig"
diff --git a/drivers/clk/mmp/Kconfig b/drivers/clk/mmp/Kconfig
new file mode 100644
index 000000000000..b0d2fea3cda5
--- /dev/null
+++ b/drivers/clk/mmp/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config COMMON_CLK_PXA1908
+	bool "Clock driver for Marvell PXA1908"
+	depends on ARCH_MMP || COMPILE_TEST
+	depends on OF
+	default y if ARCH_MMP && ARM64
+	select AUXILIARY_BUS
+	help
+	  This driver supports the Marvell PXA1908 SoC clocks.
diff --git a/drivers/clk/mmp/Makefile b/drivers/clk/mmp/Makefile
index 062cd87fa8dd..0a94f2f08563 100644
--- a/drivers/clk/mmp/Makefile
+++ b/drivers/clk/mmp/Makefile
@@ -11,4 +11,7 @@ obj-$(CONFIG_MACH_MMP_DT) += clk-of-pxa168.o clk-of-pxa910.o
 obj-$(CONFIG_COMMON_CLK_MMP2) += clk-of-mmp2.o clk-pll.o pwr-island.o
 obj-$(CONFIG_COMMON_CLK_MMP2_AUDIO) += clk-audio.o
 
-obj-$(CONFIG_ARCH_MMP) += clk-of-pxa1928.o clk-pxa1908-apbc.o clk-pxa1908-apbcp.o clk-pxa1908-apmu.o clk-pxa1908-mpmu.o
+obj-$(CONFIG_COMMON_CLK_PXA1908) += clk-pxa1908-apbc.o clk-pxa1908-apbcp.o \
+	clk-pxa1908-mpmu.o clk-pxa1908-apmu.o
+
+obj-$(CONFIG_ARCH_MMP) += clk-of-pxa1928.o
diff --git a/drivers/clk/mmp/clk-pxa1908-apmu.c b/drivers/clk/mmp/clk-pxa1908-apmu.c
index d3a070687fc5..7594a495a009 100644
--- a/drivers/clk/mmp/clk-pxa1908-apmu.c
+++ b/drivers/clk/mmp/clk-pxa1908-apmu.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#include <linux/auxiliary_bus.h>
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -85,6 +86,7 @@ static void pxa1908_axi_periph_clk_init(struct pxa1908_clk_unit *pxa_unit)
 static int pxa1908_apmu_probe(struct platform_device *pdev)
 {
 	struct pxa1908_clk_unit *pxa_unit;
+	struct auxiliary_device *adev;
 
 	pxa_unit = devm_kzalloc(&pdev->dev, sizeof(*pxa_unit), GFP_KERNEL);
 	if (!pxa_unit)
@@ -94,6 +96,11 @@ static int pxa1908_apmu_probe(struct platform_device *pdev)
 	if (IS_ERR(pxa_unit->base))
 		return PTR_ERR(pxa_unit->base);
 
+	adev = devm_auxiliary_device_create(&pdev->dev, "power", NULL);
+	if (IS_ERR(adev))
+		return dev_err_probe(&pdev->dev, PTR_ERR(adev),
+				     "Failed to register power controller\n");
+
 	mmp_clk_init(pdev->dev.of_node, &pxa_unit->unit, APMU_NR_CLKS);
 
 	pxa1908_axi_periph_clk_init(pxa_unit);