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>

diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 05ef56d5a7101a0d6b493b9f24c1e4d118677bcc..67d00fbc2e0e29e7bd426ed8f7d21b22bf6772fc 100644 (file)
--- 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);