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From 9de3b340d84b75f93081f871b640a065cba4ded0 Mon Sep 17 00:00:00 2001
From: Peng Ma <peng.ma@nxp.com>
Date: Tue, 26 Nov 2019 16:02:00 +0800
Subject: [PATCH] LF-162: i2c: imx: Defer probing if EDMA not available
EDMA may be not available or defered due to dependencies on
other modules, If these scenarios is encountered, we should
defer probing.
Signed-off-by: Peng Ma <peng.ma@nxp.com>
---
drivers/i2c/busses/i2c-imx.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -369,8 +369,8 @@ static void i2c_imx_reset_regs(struct im
}
/* Functions for DMA support */
-static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
- dma_addr_t phy_addr)
+static int i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
+ dma_addr_t phy_addr)
{
struct imx_i2c_dma *dma;
struct dma_slave_config dma_sconfig;
@@ -379,7 +379,7 @@ static void i2c_imx_dma_request(struct i
dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
if (!dma)
- return;
+ return -ENOMEM;
dma->chan_tx = dma_request_chan(dev, "tx");
if (IS_ERR(dma->chan_tx)) {
@@ -424,7 +424,7 @@ static void i2c_imx_dma_request(struct i
dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n",
dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx));
- return;
+ return 0;
fail_rx:
dma_release_channel(dma->chan_rx);
@@ -432,6 +432,8 @@ fail_tx:
dma_release_channel(dma->chan_tx);
fail_al:
devm_kfree(dev, dma);
+
+ return ret;
}
static void i2c_imx_dma_callback(void *arg)
@@ -1602,10 +1604,14 @@ static int i2c_imx_probe(struct platform
dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
/* Init DMA config if supported */
- i2c_imx_dma_request(i2c_imx, phy_addr);
+ ret = i2c_imx_dma_request(i2c_imx, phy_addr);
+ if (ret == -EPROBE_DEFER)
+ goto i2c_adapter_remove;
return 0; /* Return OK */
+i2c_adapter_remove:
+ i2c_del_adapter(&i2c_imx->adapter);
clk_notifier_unregister:
clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
free_irq(irq, i2c_imx);
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