korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-12 13:34:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

i2c: meson: use i2c core for DT clock-frequency parsing

Browse Source 
We don't have to parse the DT manually to retrieve the bus frequency
and we don't have to maintain an own default for the bus frequency.
Let the i2c core do this for us.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Heiner Kallweit 2017-03-25 14:06:35 +01:00 committed by Wolfram Sang
parent 09af1c2fa4
commit 39b2ca6853
2 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/i2c/i2c-meson.txt
View File

@ -8,6 +8,8 @@ Required properties:
- #address-cells: should be <1>
- #size-cells: should be <0>
For details regarding the following core I2C bindings see also i2c.txt.
Optional properties:
- clock-frequency: the desired I2C bus clock frequency in Hz; in
absence of this property the default value is used (100 kHz).

8
drivers/i2c/busses/i2c-meson.c
View File

@ -38,7 +38,6 @@
#define REG_CTRL_CLKDIV_MASK ((BIT(10) - 1) << REG_CTRL_CLKDIV_SHIFT)
#define I2C_TIMEOUT_MS 500
#define DEFAULT_FREQ 100000
enum {
TOKEN_END = 0,
@ -387,15 +386,14 @@ static int meson_i2c_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct meson_i2c *i2c;
struct resource *mem;
u32 freq;
struct i2c_timings timings;
int irq, ret = 0;
i2c = devm_kzalloc(&pdev->dev, sizeof(struct meson_i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", &freq))
freq = DEFAULT_FREQ;
i2c_parse_fw_timings(&pdev->dev, &timings, true);
i2c->dev = &pdev->dev;
platform_set_drvdata(pdev, i2c);
@ -452,7 +450,7 @@ static int meson_i2c_probe(struct platform_device *pdev)
return ret;
}
meson_i2c_set_clk_div(i2c, freq);
meson_i2c_set_clk_div(i2c, timings.bus_freq_hz);
return 0;
}