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authorWolfram Sang <wsa+renesas@sang-engineering.com>2020-04-01 21:30:18 +0200
committerWolfram Sang <wsa@the-dreams.de>2020-04-15 12:53:57 +0200
commitdef00b32f02729eb55088f83b0f6e076cdbb3bc3 (patch)
treeba124e7fa15b2f7c9ff47168081c1128e043c265 /drivers/i2c/i2c-core-base.c
parentf27237c174fd9653033330e4e532cd9d153ce824 (diff)
downloadlinux-def00b32f02729eb55088f83b0f6e076cdbb3bc3.tar.bz2
i2c: refactor parsing of timings
When I wanted to print the chosen values to debug output, I concluded that a helper function to parse one timing would be helpful. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/i2c-core-base.c')
-rw-r--r--drivers/i2c/i2c-core-base.c69
1 files changed, 30 insertions, 39 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 5cc0b0ec5570..a7c21d4cbd90 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1588,6 +1588,18 @@ void i2c_del_adapter(struct i2c_adapter *adap)
}
EXPORT_SYMBOL(i2c_del_adapter);
+static void i2c_parse_timing(struct device *dev, char *prop_name, u32 *cur_val_p,
+ u32 def_val, bool use_def)
+{
+ int ret;
+
+ ret = device_property_read_u32(dev, prop_name, cur_val_p);
+ if (ret && use_def)
+ *cur_val_p = def_val;
+
+ dev_dbg(dev, "%s: %u\n", prop_name, *cur_val_p);
+}
+
/**
* i2c_parse_fw_timings - get I2C related timing parameters from firmware
* @dev: The device to scan for I2C timing properties
@@ -1606,49 +1618,28 @@ EXPORT_SYMBOL(i2c_del_adapter);
*/
void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults)
{
- int ret;
-
- ret = device_property_read_u32(dev, "clock-frequency", &t->bus_freq_hz);
- if (ret && use_defaults)
- t->bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
-
- ret = device_property_read_u32(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns);
- if (ret && use_defaults) {
- if (t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ)
- t->scl_rise_ns = 1000;
- else if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ)
- t->scl_rise_ns = 300;
- else
- t->scl_rise_ns = 120;
- }
-
- ret = device_property_read_u32(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns);
- if (ret && use_defaults) {
- if (t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ)
- t->scl_fall_ns = 300;
- else
- t->scl_fall_ns = 120;
- }
-
- ret = device_property_read_u32(dev, "i2c-scl-internal-delay-ns", &t->scl_int_delay_ns);
- if (ret && use_defaults)
- t->scl_int_delay_ns = 0;
+ bool u = use_defaults;
+ u32 d;
- ret = device_property_read_u32(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns);
- if (ret && use_defaults)
- t->sda_fall_ns = t->scl_fall_ns;
+ i2c_parse_timing(dev, "clock-frequency", &t->bus_freq_hz,
+ I2C_MAX_STANDARD_MODE_FREQ, u);
- ret = device_property_read_u32(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns);
- if (ret && use_defaults)
- t->sda_hold_ns = 0;
+ d = t->bus_freq_hz <= I2C_MAX_STANDARD_MODE_FREQ ? 1000 :
+ t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
+ i2c_parse_timing(dev, "i2c-scl-rising-time-ns", &t->scl_rise_ns, d, u);
- ret = device_property_read_u32(dev, "i2c-digital-filter-width-ns", &t->digital_filter_width_ns);
- if (ret && use_defaults)
- t->digital_filter_width_ns = 0;
+ d = t->bus_freq_hz <= I2C_MAX_FAST_MODE_FREQ ? 300 : 120;
+ i2c_parse_timing(dev, "i2c-scl-falling-time-ns", &t->scl_fall_ns, d, u);
- ret = device_property_read_u32(dev, "i2c-analog-filter-cutoff-frequency", &t->analog_filter_cutoff_freq_hz);
- if (ret && use_defaults)
- t->analog_filter_cutoff_freq_hz = 0;
+ i2c_parse_timing(dev, "i2c-scl-internal-delay-ns",
+ &t->scl_int_delay_ns, 0, u);
+ i2c_parse_timing(dev, "i2c-sda-falling-time-ns", &t->sda_fall_ns,
+ t->scl_fall_ns, u);
+ i2c_parse_timing(dev, "i2c-sda-hold-time-ns", &t->sda_hold_ns, 0, u);
+ i2c_parse_timing(dev, "i2c-digital-filter-width-ns",
+ &t->digital_filter_width_ns, 0, u);
+ i2c_parse_timing(dev, "i2c-analog-filter-cutoff-frequency",
+ &t->analog_filter_cutoff_freq_hz, 0, u);
}
EXPORT_SYMBOL_GPL(i2c_parse_fw_timings);