[PATCH 03/12] i2c: meson: use i2c core for DT clock-frequency parsing

[jbrunet@baylibre.com (Jerome Brunet)]

On Wed, 2017-03-08 at 07:44 +0100, Heiner Kallweit wrote:
> 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>
> ---
> ?drivers/i2c/busses/i2c-meson.c | 13 +++++--------
> ?1 file changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-
> meson.c
> index 50059d09..5e243efa 100644
> --- a/drivers/i2c/busses/i2c-meson.c
> +++ b/drivers/i2c/busses/i2c-meson.c
> @@ -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,
> @@ -73,7 +72,7 @@ enum {
> ? * @error:	Flag set when an error is received
> ? * @lock:	To avoid race conditions between irq handler and
> xfer code
> ? * @done:	Completion used to wait for transfer termination
> - * @frequency:	Operating frequency of I2C bus clock
> + * @timings:	Struct including the bus frequency
> ? * @tokens:	Sequence of tokens to be written to the device
> ? * @num_tokens:	Number of tokens
> ? */
> @@ -92,7 +91,7 @@ struct meson_i2c {
> ?
> ?	spinlock_t		lock;
> ?	struct completion	done;
> -	unsigned int		frequency;
> +	struct i2c_timings	timings;
> ?	u32			tokens[2];
> ?	int			num_tokens;
> ?};
> @@ -136,12 +135,12 @@ static void meson_i2c_set_clk_div(struct
> meson_i2c *i2c)
> ?	unsigned long clk_rate = clk_get_rate(i2c->clk);
> ?	unsigned int div;
> ?
> -	div = DIV_ROUND_UP(clk_rate, i2c->frequency * 4);
> +	div = DIV_ROUND_UP(clk_rate, i2c->timings.bus_freq_hz * 4);
> ?	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK,
> ?			???div << REG_CTRL_CLKDIV_SHIFT);
> ?
> ?	dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n",
> __func__,
> -		clk_rate, i2c->frequency, div);
> +		clk_rate, i2c->timings.bus_freq_hz, div);
> ?}
> ?
> ?static void meson_i2c_get_data(struct meson_i2c *i2c, char *buf, int
> len)
> @@ -396,9 +395,7 @@ static int meson_i2c_probe(struct platform_device
> *pdev)
> ?	if (!i2c)
> ?		return -ENOMEM;
> ?
> -	if (of_property_read_u32(pdev->dev.of_node, "clock-
> frequency",
> -				?&i2c->frequency))
> -		i2c->frequency = DEFAULT_FREQ;
> +	i2c_parse_fw_timings(&pdev->dev, &i2c->timings, true);
> ?
> ?	i2c->dev = &pdev->dev;
> ?	platform_set_drvdata(pdev, i2c);

Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>