dmaengine: dw_dma: add Device Tree probing capability

SPEAr platforms now support DT and so must convert all drivers to support DT.
This patch adds DT probing support for Synopsys DMA controller and updates its
documentation too.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/dma/snps-dma.txt b/Documentation/devicetree/bindings/dma/snps-dma.txt
new file mode 100644 (file)
index 0000000..c0d85db
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
@@ -0,0 +1,17 @@
+* Synopsys Designware DMA Controller
+
+Required properties:
+- compatible: "snps,dma-spear1340"
+- reg: Address range of the DMAC registers
+- interrupt-parent: Should be the phandle for the interrupt controller
+  that services interrupts for this device
+- interrupt: Should contain the DMAC interrupt number
+
+Example:
+
+       dma@fc000000 {
+               compatible = "snps,dma-spear1340";
+               reg = <0xfc000000 0x1000>;
+               interrupt-parent = <&vic1>;
+               interrupts = <12>;
+       };

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 300d976b66617e1ac02f0de059a8b0c5a736c554..13b92983b241e4921af97d2ab3706ac23a473729 100644 (file)
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -1592,12 +1593,21 @@ static const struct dev_pm_ops dw_dev_pm_ops = {
        .poweroff_noirq = dw_suspend_noirq,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id dw_dma_id_table[] = {
+       { .compatible = "snps,dma-spear1340" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, dw_dma_id_table);
+#endif
+
 static struct platform_driver dw_driver = {
        .remove         = __exit_p(dw_remove),
        .shutdown       = dw_shutdown,
        .driver = {
                .name   = "dw_dmac",
                .pm     = &dw_dev_pm_ops,
+               .of_match_table = of_match_ptr(dw_dma_id_table),
        },
 };