[U-Boot] [PATCH v1 2/2] x86: acpi: Add DMA descriptors for I2C1 on Intel Tangier

Andy Shevchenko andriy.shevchenko at linux.intel.com
Tue Feb 26 11:43:15 UTC 2019


Intel Tangier SoC has a general purpose DMA which can serve to speed up
communications on SPI and I2C serial buses.

Provide DMA descriptors to utilize this capability in the future.

Note, I2C6, which is available to user, has no DMA request lines connected.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
 .../include/asm/arch-tangier/acpi/southcluster.asl    | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/include/asm/arch-tangier/acpi/southcluster.asl b/arch/x86/include/asm/arch-tangier/acpi/southcluster.asl
index e4d876ab78..1f940511a1 100644
--- a/arch/x86/include/asm/arch-tangier/acpi/southcluster.asl
+++ b/arch/x86/include/asm/arch-tangier/acpi/southcluster.asl
@@ -232,6 +232,17 @@ Device (PCI0)
         {
             Return (STA_VISIBLE)
         }
+
+        Name (RBUF, ResourceTemplate()
+        {
+            FixedDMA(0x0009, 0x0000, Width32bit, )
+            FixedDMA(0x0008, 0x0001, Width32bit, )
+        })
+
+        Method (_CRS, 0, NotSerialized)
+        {
+            Return (RBUF)
+        }
     }
 
     Device (I2C6)
-- 
2.20.1



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