diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-03-21 12:36:34 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2019-03-27 14:09:53 +0100 |
| commit | 265bd824e17f4d390c4c05a791bc79b745a565b2 (patch) | |
| tree | 9409c907932d55c709e813036ebbc20140d20f5c /drivers/i2c | |
| parent | 529766e0a0114438887382a68d97341fbf8349fb (diff) | |
| download | linux-265bd824e17f4d390c4c05a791bc79b745a565b2.tar.bz2 | |
i2c: at91: Convert to use struct i2c_timings
Instead of using custom variables and parser, convert the driver to use
the ones provided by I2C core.
No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-at91-master.c | 23 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-at91.h | 1 |
2 files changed, 8 insertions, 16 deletions
diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c index 2fca78711f81..e87232f2e708 100644 --- a/drivers/i2c/busses/i2c-at91-master.c +++ b/drivers/i2c/busses/i2c-at91-master.c @@ -43,16 +43,18 @@ void at91_init_twi_bus_master(struct at91_twi_dev *dev) * Calculate symmetric clock as stated in datasheet: * twi_clk = F_MAIN / (2 * (cdiv * (1 << ckdiv) + offset)) */ -static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk) +static void at91_calc_twi_clock(struct at91_twi_dev *dev) { int ckdiv, cdiv, div, hold = 0; struct at91_twi_pdata *pdata = dev->pdata; int offset = pdata->clk_offset; int max_ckdiv = pdata->clk_max_div; - u32 twd_hold_time_ns = 0; + struct i2c_timings timings, *t = &timings; + + i2c_parse_fw_timings(dev->dev, t, true); div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk), - 2 * twi_clk) - offset); + 2 * t->bus_freq_hz) - offset); ckdiv = fls(div >> 8); cdiv = div >> ckdiv; @@ -64,15 +66,12 @@ static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk) } if (pdata->has_hold_field) { - of_property_read_u32(dev->dev->of_node, "i2c-sda-hold-time-ns", - &twd_hold_time_ns); - /* * hold time = HOLD + 3 x T_peripheral_clock * Use clk rate in kHz to prevent overflows when computing * hold. */ - hold = DIV_ROUND_UP(twd_hold_time_ns + hold = DIV_ROUND_UP(t->sda_hold_ns * (clk_get_rate(dev->clk) / 1000), 1000000); hold -= 3; if (hold < 0) @@ -89,7 +88,7 @@ static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk) | AT91_TWI_CWGR_HOLD(hold); dev_dbg(dev->dev, "cdiv %d ckdiv %d hold %d (%d ns)\n", - cdiv, ckdiv, hold, twd_hold_time_ns); + cdiv, ckdiv, hold, t->sda_hold_ns); } static void at91_twi_dma_cleanup(struct at91_twi_dev *dev) @@ -772,7 +771,6 @@ int at91_twi_probe_master(struct platform_device *pdev, u32 phy_addr, struct at91_twi_dev *dev) { int rc; - u32 bus_clk_rate; init_completion(&dev->cmd_complete); @@ -794,12 +792,7 @@ int at91_twi_probe_master(struct platform_device *pdev, dev_info(dev->dev, "Using FIFO (%u data)\n", dev->fifo_size); } - rc = of_property_read_u32(dev->dev->of_node, "clock-frequency", - &bus_clk_rate); - if (rc) - bus_clk_rate = DEFAULT_TWI_CLK_HZ; - - at91_calc_twi_clock(dev, bus_clk_rate); + at91_calc_twi_clock(dev); dev->adapter.algo = &at91_twi_algorithm; dev->adapter.quirks = &at91_twi_quirks; diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h index be0e7afda529..499b506f6128 100644 --- a/drivers/i2c/busses/i2c-at91.h +++ b/drivers/i2c/busses/i2c-at91.h @@ -21,7 +21,6 @@ #include <linux/platform_data/dma-atmel.h> #include <linux/platform_device.h> -#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */ #define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */ #define AT91_I2C_DMA_THRESHOLD 8 /* enable DMA if transfer size is bigger than this threshold */ #define AUTOSUSPEND_TIMEOUT 2000 |