spi: spi-mem: add spi_mem_dtr_supports_op()

[linux-2.6-microblaze.git] / drivers / spi / spi-mem.c

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index c64371c..dc713b0 100644 (file)
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -137,8 +137,8 @@ static int spi_check_buswidth_req(struct spi_mem *mem, u8 buswidth, bool tx)
        return -ENOTSUPP;
 }
 
-bool spi_mem_default_supports_op(struct spi_mem *mem,
-                                const struct spi_mem_op *op)
+static bool spi_mem_check_buswidth(struct spi_mem *mem,
+                                  const struct spi_mem_op *op)
 {
        if (spi_check_buswidth_req(mem, op->cmd.buswidth, true))
                return false;
@@ -156,13 +156,29 @@ bool spi_mem_default_supports_op(struct spi_mem *mem,
                                   op->data.dir == SPI_MEM_DATA_OUT))
                return false;
 
+       return true;
+}
+
+bool spi_mem_dtr_supports_op(struct spi_mem *mem,
+                            const struct spi_mem_op *op)
+{
+       if (op->cmd.nbytes != 2)
+               return false;
+
+       return spi_mem_check_buswidth(mem, op);
+}
+EXPORT_SYMBOL_GPL(spi_mem_dtr_supports_op);
+
+bool spi_mem_default_supports_op(struct spi_mem *mem,
+                                const struct spi_mem_op *op)
+{
        if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
                return false;
 
        if (op->cmd.nbytes != 1)
                return false;
 
-       return true;
+       return spi_mem_check_buswidth(mem, op);
 }
 EXPORT_SYMBOL_GPL(spi_mem_default_supports_op);