[PATCH v6 31/35] i2c: tegra: Clean up variable names

From: Dmitry Osipenko
Date: Mon Sep 07 2020 - 22:14:15 EST

Rename "ret" variables to "err" in order to make code a bit more
expressive, emphasizing that the returned value is an error code.

Rename variable "reg" to "val" in order to better reflect the actual
usage of the variable in the code and to make naming consistent with
the rest of the code.

Use briefer names for a few members of the tegra_i2c_dev structure in
order to improve readability of the code.

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/i2c/busses/i2c-tegra.c | 109 ++++++++++++++++-----------------
1 file changed, 54 insertions(+), 55 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 62c7334fe601..44c75595a173 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -247,15 +247,15 @@ struct tegra_i2c_hw_feature {
* @msg_buf_remaining: size of unsent data in the message buffer
* @msg_read: identifies read transfers
* @bus_clk_rate: current I2C bus clock rate
- * @is_multimaster_mode: track if I2C controller is in multi-master mode
+ * @multimaster_mode: indicates that I2C controller is in multi-master mode
* @tx_dma_chan: DMA transmit channel
* @rx_dma_chan: DMA receive channel
* @dma_phys: handle to DMA resources
* @dma_buf: pointer to allocated DMA buffer
* @dma_buf_size: DMA buffer size
- * @is_curr_dma_xfer: indicates active DMA transfer
+ * @dma_mode: indicates active DMA transfer
* @dma_complete: DMA completion notifier
- * @is_curr_atomic_xfer: indicates active atomic transfer
+ * @atomic_mode: indicates active atomic transfer
*/
struct tegra_i2c_dev {
struct device *dev;
@@ -287,9 +287,9 @@ struct tegra_i2c_dev {
dma_addr_t dma_phys;
u32 *dma_buf;

- bool is_multimaster_mode;
- bool is_curr_atomic_xfer;
- bool is_curr_dma_xfer;
+ bool multimaster_mode;
+ bool atomic_mode;
+ bool dma_mode;
bool msg_read;
bool is_dvc;
bool is_vi;
@@ -525,7 +525,7 @@ static int tegra_i2c_poll_register(struct tegra_i2c_dev *i2c_dev,
void __iomem *addr = i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg);
u32 val;

- if (!i2c_dev->is_curr_atomic_xfer)
+ if (!i2c_dev->atomic_mode)
return readl_relaxed_poll_timeout(addr, val, !(val & mask),
delay_us, timeout_us);

@@ -673,7 +673,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
if (err)
return err;

- if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
+ if (i2c_dev->multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE);

err = tegra_i2c_wait_for_config_load(i2c_dev);
@@ -859,7 +859,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
if (i2c_dev->hw->supports_bus_clear && (status & I2C_INT_BUS_CLR_DONE))
goto err;

- if (!i2c_dev->is_curr_dma_xfer) {
+ if (!i2c_dev->dma_mode) {
if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
/*
@@ -893,7 +893,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
* so forcing msg_buf_remaining to 0 in DMA mode.
*/
if (status & I2C_INT_PACKET_XFER_COMPLETE) {
- if (i2c_dev->is_curr_dma_xfer)
+ if (i2c_dev->dma_mode)
i2c_dev->msg_buf_remaining = 0;
/*
* Underflow error condition: XFER_COMPLETE before message
@@ -917,7 +917,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
if (i2c_dev->is_dvc)
dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (i2c_dev->msg_read)
dmaengine_terminate_async(i2c_dev->rx_dma_chan);
else
@@ -936,14 +936,14 @@ static int tegra_i2c_config_fifo_trig(struct tegra_i2c_dev *i2c_dev, size_t len)
struct dma_slave_config slv_config = {0};
u32 val, reg, dma_burst, reg_offset;
struct dma_chan *chan;
- int ret;
+ int err;

if (i2c_dev->hw->has_mst_fifo)
reg = I2C_MST_FIFO_CONTROL;
else
reg = I2C_FIFO_CONTROL;

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (len & 0xF)
dma_burst = 1;
else if (len & 0x10)
@@ -976,11 +976,11 @@ static int tegra_i2c_config_fifo_trig(struct tegra_i2c_dev *i2c_dev, size_t len)
}

slv_config.device_fc = true;
- ret = dmaengine_slave_config(chan, &slv_config);
- if (ret) {
+ err = dmaengine_slave_config(chan, &slv_config);
+ if (err) {
dev_err(i2c_dev->dev, "DMA slave config failed: %d\n",
- ret);
- return ret;
+ err);
+ return err;
}

goto out;
@@ -1030,7 +1030,7 @@ static unsigned long tegra_i2c_wait_completion(struct tegra_i2c_dev *i2c_dev,
{
unsigned long ret;

- if (i2c_dev->is_curr_atomic_xfer) {
+ if (i2c_dev->atomic_mode) {
ret = tegra_i2c_poll_completion(i2c_dev, complete, timeout_ms);
} else {
enable_irq(i2c_dev->irq);
@@ -1058,20 +1058,20 @@ static unsigned long tegra_i2c_wait_completion(struct tegra_i2c_dev *i2c_dev,
static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
{
struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
- u32 reg, time_left;
+ u32 val, time_left;
int err;

reinit_completion(&i2c_dev->msg_complete);
- reg = FIELD_PREP(I2C_BC_SCLK_THRESHOLD, 9) | I2C_BC_STOP_COND |
+ val = FIELD_PREP(I2C_BC_SCLK_THRESHOLD, 9) | I2C_BC_STOP_COND |
I2C_BC_TERMINATE;
- i2c_writel(i2c_dev, reg, I2C_BUS_CLEAR_CNFG);
+ i2c_writel(i2c_dev, val, I2C_BUS_CLEAR_CNFG);

err = tegra_i2c_wait_for_config_load(i2c_dev);
if (err)
return err;

- reg |= I2C_BC_ENABLE;
- i2c_writel(i2c_dev, reg, I2C_BUS_CLEAR_CNFG);
+ val |= I2C_BC_ENABLE;
+ i2c_writel(i2c_dev, val, I2C_BUS_CLEAR_CNFG);
tegra_i2c_unmask_irq(i2c_dev, I2C_INT_BUS_CLR_DONE);

time_left = tegra_i2c_wait_completion(i2c_dev, &i2c_dev->msg_complete,
@@ -1083,8 +1083,8 @@ static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
return -ETIMEDOUT;
}

- reg = i2c_readl(i2c_dev, I2C_BUS_CLEAR_STATUS);
- if (!(reg & I2C_BC_STATUS)) {
+ val = i2c_readl(i2c_dev, I2C_BUS_CLEAR_STATUS);
+ if (!(val & I2C_BC_STATUS)) {
dev_err(i2c_dev->dev,
"un-recovered arbitration lost\n");
return -EIO;
@@ -1106,14 +1106,14 @@ static void tegra_i2c_push_packet_header(struct tegra_i2c_dev *i2c_dev,
FIELD_PREP(PACKET_HEADER0_CONT_ID, i2c_dev->cont_id) |
FIELD_PREP(PACKET_HEADER0_PACKET_ID, 1);

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);

packet_header = msg->len - 1;

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
@@ -1138,7 +1138,7 @@ static void tegra_i2c_push_packet_header(struct tegra_i2c_dev *i2c_dev,
if (msg->flags & I2C_M_RD)
packet_header |= I2C_HEADER_READ;

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
@@ -1154,7 +1154,7 @@ static int tegra_i2c_error_recover(struct tegra_i2c_dev *i2c_dev,

/* start recovery upon arbitration loss in single master mode */
if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) {
- if (!i2c_dev->is_multimaster_mode)
+ if (!i2c_dev->multimaster_mode)
return i2c_recover_bus(&i2c_dev->adapter);

return -EAGAIN;
@@ -1195,9 +1195,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
xfer_size = msg->len + I2C_PACKET_HEADER_SIZE;

xfer_size = ALIGN(xfer_size, BYTES_PER_FIFO_WORD);
- i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_PREFERRED_LEN) &&
- i2c_dev->dma_buf &&
- !i2c_dev->is_curr_atomic_xfer;
+ i2c_dev->dma_mode = (xfer_size > I2C_PIO_MODE_PREFERRED_LEN) &&
+ i2c_dev->dma_buf && !i2c_dev->atomic_mode;

err = tegra_i2c_config_fifo_trig(i2c_dev, xfer_size);
if (err)
@@ -1212,7 +1211,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,

int_mask = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
tegra_i2c_unmask_irq(i2c_dev, int_mask);
- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (i2c_dev->msg_read) {
dma_sync_single_for_device(i2c_dev->dev,
i2c_dev->dma_phys,
@@ -1237,7 +1236,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
tegra_i2c_push_packet_header(i2c_dev, msg, end_state);

if (!i2c_dev->msg_read) {
- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
memcpy(i2c_dev->dma_buf, msg->buf, msg->len);
dma_sync_single_for_device(i2c_dev->dev,
i2c_dev->dma_phys,
@@ -1257,7 +1256,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,

if (i2c_dev->hw->has_per_pkt_xfer_complete_irq)
int_mask |= I2C_INT_PACKET_XFER_COMPLETE;
- if (!i2c_dev->is_curr_dma_xfer) {
+ if (!i2c_dev->dma_mode) {
if (msg->flags & I2C_M_RD)
int_mask |= I2C_INT_RX_FIFO_DATA_REQ;
else if (i2c_dev->msg_buf_remaining)
@@ -1268,7 +1267,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
dev_dbg(i2c_dev->dev, "unmasked irq: %02x\n",
i2c_readl(i2c_dev, I2C_INT_MASK));

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
time_left = tegra_i2c_wait_completion(i2c_dev,
&i2c_dev->dma_complete,
xfer_time);
@@ -1317,7 +1316,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
time_left, completion_done(&i2c_dev->msg_complete),
i2c_dev->msg_err);

- i2c_dev->is_curr_dma_xfer = false;
+ i2c_dev->dma_mode = false;

err = tegra_i2c_error_recover(i2c_dev, msg);
if (err)
@@ -1369,9 +1368,9 @@ static int tegra_i2c_xfer_atomic(struct i2c_adapter *adap,
struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
int ret;

- i2c_dev->is_curr_atomic_xfer = true;
+ i2c_dev->atomic_mode = true;
ret = tegra_i2c_xfer(adap, msgs, num);
- i2c_dev->is_curr_atomic_xfer = false;
+ i2c_dev->atomic_mode = false;

return ret;
}
@@ -1596,15 +1595,15 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
{
struct device_node *np = i2c_dev->dev->of_node;
bool multi_mode;
- int ret;
+ int err;

- ret = of_property_read_u32(np, "clock-frequency",
+ err = of_property_read_u32(np, "clock-frequency",
&i2c_dev->bus_clk_rate);
- if (ret)
+ if (err)
i2c_dev->bus_clk_rate = I2C_MAX_STANDARD_MODE_FREQ; /* default clock rate */

multi_mode = of_property_read_bool(np, "multi-master");
- i2c_dev->is_multimaster_mode = multi_mode;
+ i2c_dev->multimaster_mode = multi_mode;

if (of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc"))
i2c_dev->is_dvc = true;
@@ -1635,7 +1634,7 @@ static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)
}
}

- if (!i2c_dev->is_multimaster_mode)
+ if (!i2c_dev->multimaster_mode)
return 0;

err = clk_enable(i2c_dev->div_clk);
@@ -1654,7 +1653,7 @@ static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)

static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
{
- if (i2c_dev->is_multimaster_mode)
+ if (i2c_dev->multimaster_mode)
clk_disable(i2c_dev->div_clk);

clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
@@ -1798,15 +1797,15 @@ static int tegra_i2c_remove(struct platform_device *pdev)
static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
{
struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
- int ret;
+ int err;

- ret = pinctrl_pm_select_default_state(i2c_dev->dev);
- if (ret)
- return ret;
+ err = pinctrl_pm_select_default_state(i2c_dev->dev);
+ if (err)
+ return err;

- ret = clk_bulk_enable(i2c_dev->nclocks, i2c_dev->clocks);
- if (ret)
- return ret;
+ err = clk_bulk_enable(i2c_dev->nclocks, i2c_dev->clocks);
+ if (err)
+ return err;

/*
* VI I2C device is attached to VE power domain which goes through
@@ -1815,8 +1814,8 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
* domain ON.
*/
if (i2c_dev->is_vi) {
- ret = tegra_i2c_init(i2c_dev);
- if (ret)
+ err = tegra_i2c_init(i2c_dev);
+ if (err)
goto disable_clocks;
}

@@ -1825,7 +1824,7 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
disable_clocks:
clk_bulk_disable(i2c_dev->nclocks, i2c_dev->clocks);

- return ret;
+ return err;
}

static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
--
2.27.0