spi: dw: Add an initialization priority Kconfig option

On Quark SE, SPI might require GPIO to be ready before hand, to emulate
CS, thus providing an option to tweak the intialization priority for SPI
DW driver.

Change-Id: Ifa373948ac8227bf6e4ed1113bcb4dc9139b6663
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

arch/x86/soc/quark_se/Kconfig

@@ -234,6 +234,9 @@ config GPIO_DW_INIT_PRIORITY
 config I2C_INIT_PRIORITY
 	default 60
 
+config SPI_DW_INIT_PRIORITY
+	default 70 # It might require GPIO to be ready first
+
 if UART_NS16550
 
 config UART_NS16550_PORT_0

drivers/spi/Kconfig

@@ -237,6 +237,12 @@ config SPI_DW_CS_GPIO
 	depends on SPI_DW && GPIO
 	default n
 
+config SPI_DW_INIT_PRIORITY
+	int "Init priority"
+	default 60
+	help
+	  Device driver initialization priority.
+
 choice
 depends on SPI_DW
 prompt "DesignWare SPI interrupt trigger condition"

drivers/spi/spi_dw.c

@@ -579,7 +579,7 @@ DECLARE_DEVICE_INIT_CONFIG(spi_dw_port_0, CONFIG_SPI_DW_PORT_0_DRV_NAME,
 			   spi_dw_init, &spi_dw_config_0);
 
 SYS_DEFINE_DEVICE(spi_dw_port_0, &spi_dw_data_port_0, SECONDARY,
-		  CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
+		  CONFIG_SPI_DW_INIT_PRIORITY);
 
 void spi_config_0_irq(void)
 {
@@ -612,7 +612,7 @@ DECLARE_DEVICE_INIT_CONFIG(spi_dw_port_1, CONFIG_SPI_DW_PORT_1_DRV_NAME,
 			   spi_dw_init, &spi_dw_config_1);
 
 SYS_DEFINE_DEVICE(spi_dw_port_1, &spi_dw_data_port_1, SECONDARY,
-		  CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
+		  CONFIG_SPI_DW_INIT_PRIORITY);
 
 void spi_config_1_irq(void)
 {