linux-kernel - [patch v3 2/5] build configuration for AST2500 DMA UART driver

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Date:   Tue, 25 Jun 2019 16:14:33 +0530
From:   "sudheer.v" <open.sudheer@...il.com>
To:     gregkh@...uxfoundation.org, jslaby@...e.com, joel@....id.au,
        andrew@...id.au, benh@...nel.crashing.org, robh+dt@...nel.org,
        mark.rutland@....com,
        shivahshankar.shankarnarayanrao@...eedtech.com,
        shivahshankar@...il.com, sudheer.veliseti@...eedtech.com
Cc:     sudheer veliseti <sudheer.open@...il.com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-aspeed@...ts.ozlabs.org
Subject: [patch v3 2/5] build configuration for AST2500 DMA UART driver

From: sudheer veliseti <sudheer.open@...il.com>

build config for DMA based UART driver in AST2500.
Total Available  UARTs in AST2500 are 4

Signed-off-by: sudheer veliseti <sudheer.open@...il.com>
---

Changes in v3:
- change logs added

drivers/tty/serial/8250/Kconfig  | 35 +++++++++++++++++++++++++++++++-
 drivers/tty/serial/8250/Makefile |  1 +
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 15c2c5463835..c793466a1c47 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -45,7 +45,7 @@ config SERIAL_8250_DEPRECATED_OPTIONS
 	  keep the 8250_core.* options around until they revert the changes
 	  they already did.
 
-	  If 8250 is built as a module, this adds 8250_core alias instead. 
+	  If 8250 is built as a module, this adds 8250_core alias instead.
 
 	  If you did not notice yet and/or you have userspace from pre-3.7, it
 	  is safe (and recommended) to say N here.
@@ -189,6 +189,39 @@ config SERIAL_8250_RUNTIME_UARTS
 	  with the module parameter "nr_uarts", or boot-time parameter
 	  8250.nr_uarts
 
+config  AST_SERIAL_DMA_UART
+        tristate "AST UART driver with DMA"
+        select SERIAL_CORE
+        help
+          UART driver with DMA support for Aspeed BMC AST25XX.
+          this driver supports UARTs in AST2500,AST2600. It uses
+          DMA channel of DMA engines present in these chips.
+          since this dma engine is used only by UARTs it is not
+          added as a separate DMA driver instead added as a layer
+          within UART driver.
+
+
+config AST_NR_DMA_UARTS
+        int "Maximum number of uart dma serial ports"
+        depends on AST_SERIAL_DMA_UART
+        default "4"
+        help
+          Set this to the number of serial ports you want the driver
+          to support.  This includes any ports discovered via ACPI or
+          PCI enumeration and any ports that may be added at run-time
+          via hot-plug, or any ISA multi-port serial cards.
+
+config AST_RUNTIME_DMA_UARTS
+        int "Number of uart dma serial ports to register at runtime"
+        depends on AST_SERIAL_DMA_UART
+        range 0 AST_NR_DMA_UARTS
+        default "4"
+        help
+          Set this to the maximum number of serial ports you want
+          the kernel to register at boot time.  This can be overridden
+          with the module parameter "nr_uarts", or boot-time parameter
+          8250.nr_uarts
+
 config SERIAL_8250_EXTENDED
 	bool "Extended 8250/16550 serial driver options"
 	depends on SERIAL_8250
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 18751bc63a84..54d40e5c6e2a 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_SERIAL_8250_LPSS)		+= 8250_lpss.o
 obj-$(CONFIG_SERIAL_8250_MID)		+= 8250_mid.o
 obj-$(CONFIG_SERIAL_8250_MOXA)		+= 8250_moxa.o
 obj-$(CONFIG_SERIAL_8250_PXA)		+= 8250_pxa.o
+obj-$(CONFIG_AST_SERIAL_DMA_UART)	+= 8250_ast2500_uart_dma.o
 obj-$(CONFIG_SERIAL_OF_PLATFORM)	+= 8250_of.o
 
 CFLAGS_8250_ingenic.o += -I$(srctree)/scripts/dtc/libfdt
-- 
2.17.1