at86rf230: add slp_tr support to start tx

This patch adds support for one of the slp_tr gpio use cases which
indicates the TX_START command without doing some spi bus traffic.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 21 insertions, 6 deletions

diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 05ef56d5a710..67d00fbc2e0e 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -85,6 +85,7 @@ struct at86rf230_local {
         struct ieee802154_hw *hw;
         struct at86rf2xx_chip_data *data;
         struct regmap *regmap;
+        int slp_tr;
 
         struct completion state_complete;
         struct at86rf230_state_change state;
@@ -339,6 +340,14 @@ at86rf230_write_subreg(struct at86rf230_local *lp,
         return regmap_update_bits(lp->regmap, addr, mask, data << shift);
 }
 
+static inline void
+at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
+{
+        gpio_set_value(lp->slp_tr, 1);
+        udelay(1);
+        gpio_set_value(lp->slp_tr, 0);
+}
+
 static bool
 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 {
@@ -940,13 +949,18 @@ at86rf230_write_frame_complete(void *context)
         u8 *buf = ctx->buf;
         int rc;
 
-        buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
-        buf[1] = STATE_BUSY_TX;
         ctx->trx.len = 2;
-        ctx->msg.complete = NULL;
-        rc = spi_async(lp->spi, &ctx->msg);
-        if (rc)
-                at86rf230_async_error(lp, ctx, rc);
+
+        if (gpio_is_valid(lp->slp_tr)) {
+                at86rf230_slp_tr_rising_edge(lp);
+        } else {
+                buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
+                buf[1] = STATE_BUSY_TX;
+                ctx->msg.complete = NULL;
+                rc = spi_async(lp->spi, &ctx->msg);
+                if (rc)
+                        at86rf230_async_error(lp, ctx, rc);
+        }
 }
 
 static void
@@ -1680,6 +1694,7 @@ static int at86rf230_probe(struct spi_device *spi)
         lp = hw->priv;
         lp->hw = hw;
         lp->spi = spi;
+        lp->slp_tr = slp_tr;
         hw->parent = &spi->dev;
         hw->vif_data_size = sizeof(*lp);
         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);