i2c: at91: convert to dma_request_slave_channel_compat()

Use generic DMA DT helper. Platforms booting with or without DT populated are
both supported.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 25 insertions, 24 deletions

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 2fcd2755233d..6bb839b688be 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -605,11 +605,16 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
 MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
 #endif
 
-static bool filter(struct dma_chan *chan, void *slave)
+static bool filter(struct dma_chan *chan, void *pdata)
 {
-        struct at_dma_slave *sl = slave;
+        struct at91_twi_pdata *sl_pdata = pdata;
+        struct at_dma_slave *sl;
 
-        if (sl->dma_dev == chan->device->dev) {
+        if (!sl_pdata)
+                return false;
+
+        sl = &sl_pdata->dma_slave;
+        if (sl && (sl->dma_dev == chan->device->dev)) {
                 chan->private = sl;
                 return true;
         } else {
@@ -620,11 +625,10 @@ static bool filter(struct dma_chan *chan, void *slave)
 static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
 {
         int ret = 0;
-        struct at_dma_slave *sdata;
+        struct at91_twi_pdata *pdata = dev->pdata;
         struct dma_slave_config slave_config;
         struct at91_twi_dma *dma = &dev->dma;
-
-        sdata = &dev->pdata->dma_slave;
+        dma_cap_mask_t mask;
 
         memset(&slave_config, 0, sizeof(slave_config));
         slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
@@ -635,25 +639,22 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
         slave_config.dst_maxburst = 1;
         slave_config.device_fc = false;
 
-        if (sdata && sdata->dma_dev) {
-                dma_cap_mask_t mask;
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
 
-                dma_cap_zero(mask);
-                dma_cap_set(DMA_SLAVE, mask);
-                dma->chan_tx = dma_request_channel(mask, filter, sdata);
-                if (!dma->chan_tx) {
-                        dev_err(dev->dev, "no DMA channel available for tx\n");
-                        ret = -EBUSY;
-                        goto error;
-                }
-                dma->chan_rx = dma_request_channel(mask, filter, sdata);
-                if (!dma->chan_rx) {
-                        dev_err(dev->dev, "no DMA channel available for rx\n");
-                        ret = -EBUSY;
-                        goto error;
-                }
-        } else {
-                ret = -EINVAL;
+        dma->chan_tx = dma_request_slave_channel_compat(mask, filter, pdata,
+                                                        dev->dev, "tx");
+        if (!dma->chan_tx) {
+                dev_err(dev->dev, "can't get a DMA channel for tx\n");
+                ret = -EBUSY;
+                goto error;
+        }
+
+        dma->chan_rx = dma_request_slave_channel_compat(mask, filter, pdata,
+                                                        dev->dev, "rx");
+        if (!dma->chan_rx) {
+                dev_err(dev->dev, "can't get a DMA channel for rx\n");
+                ret = -EBUSY;
                 goto error;
         }