Use i2c_timings struct and corresponding methods to get bus clock frequency
Signed-off-by: Akhil R akhilrajeev@nvidia.com Suggested-by: Andy Shevchenko andy.shevchenko@gmail.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com --- drivers/i2c/busses/i2c-tegra.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-)
v1->v2: Added temp var for i2c_timings struct in function.
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index a5be8f0..4cbe89b 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -246,7 +246,7 @@ struct tegra_i2c_hw_feature { * @msg_buf: pointer to current message data * @msg_buf_remaining: size of unsent data in the message buffer * @msg_read: indicates that the transfer is a read access - * @bus_clk_rate: current I2C bus clock rate + * @timings: i2c timings information like bus frequency * @multimaster_mode: indicates that I2C controller is in multi-master mode * @tx_dma_chan: DMA transmit channel * @rx_dma_chan: DMA receive channel @@ -273,7 +273,7 @@ struct tegra_i2c_dev { unsigned int nclocks;
struct clk *div_clk; - u32 bus_clk_rate; + struct i2c_timings timings;
struct completion msg_complete; size_t msg_buf_remaining; @@ -610,6 +610,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) { u32 val, clk_divisor, clk_multiplier, tsu_thd, tlow, thigh, non_hs_mode; acpi_handle handle = ACPI_HANDLE(i2c_dev->dev); + struct i2c_timings *t = &i2c_dev->timings; int err;
/* @@ -642,14 +643,14 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) if (i2c_dev->is_vi) tegra_i2c_vi_init(i2c_dev);
- switch (i2c_dev->bus_clk_rate) { + switch (t->bus_freq_hz) { case I2C_MAX_STANDARD_MODE_FREQ + 1 ... I2C_MAX_FAST_MODE_PLUS_FREQ: default: tlow = i2c_dev->hw->tlow_fast_fastplus_mode; thigh = i2c_dev->hw->thigh_fast_fastplus_mode; tsu_thd = i2c_dev->hw->setup_hold_time_fast_fast_plus_mode;
- if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ) + if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) non_hs_mode = i2c_dev->hw->clk_divisor_fast_plus_mode; else non_hs_mode = i2c_dev->hw->clk_divisor_fast_mode; @@ -685,7 +686,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) clk_multiplier = (tlow + thigh + 2) * (non_hs_mode + 1);
err = clk_set_rate(i2c_dev->div_clk, - i2c_dev->bus_clk_rate * clk_multiplier); + t->bus_freq_hz * clk_multiplier); if (err) { dev_err(i2c_dev->dev, "failed to set div-clk rate: %d\n", err); return err; @@ -724,7 +725,7 @@ static int tegra_i2c_disable_packet_mode(struct tegra_i2c_dev *i2c_dev) * before disabling the controller so that the STOP condition has * been delivered properly. */ - udelay(DIV_ROUND_UP(2 * 1000000, i2c_dev->bus_clk_rate)); + udelay(DIV_ROUND_UP(2 * 1000000, i2c_dev->timings.bus_freq_hz));
cnfg = i2c_readl(i2c_dev, I2C_CNFG); if (cnfg & I2C_CNFG_PACKET_MODE_EN) @@ -1254,7 +1255,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, * Total bits = 9 bits per byte (including ACK bit) + Start & stop bits */ xfer_time += DIV_ROUND_CLOSEST(((xfer_size * 9) + 2) * MSEC_PER_SEC, - i2c_dev->bus_clk_rate); + i2c_dev->timings.bus_freq_hz);
int_mask = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST; tegra_i2c_unmask_irq(i2c_dev, int_mask); @@ -1633,10 +1634,7 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev) bool multi_mode; int err;
- err = device_property_read_u32(i2c_dev->dev, "clock-frequency", - &i2c_dev->bus_clk_rate); - if (err) - i2c_dev->bus_clk_rate = I2C_MAX_STANDARD_MODE_FREQ; + i2c_parse_fw_timings(i2c_dev->dev, &i2c_dev->timings, true);
multi_mode = device_property_read_bool(i2c_dev->dev, "multi-master"); i2c_dev->multimaster_mode = multi_mode;