On 24.10.2014 17:39, Mikko Perttunen wrote:
> From: Tuomas Tynkkynen <[email protected]>
>
> With closed loop support, the clock rate of the DFLL can be adjusted.
>
> The oscillator itself in the DFLL is a free-running oscillator whose
> rate is directly determined the supply voltage. However, the DFLL
> module contains logic to compare the DFLL output rate to a fixed
> reference clock (51 MHz) and make a decision to either lower or raise
> the DFLL supply voltage. The DFLL module can then autonomously change
> the supply voltage by communicating with an off-chip PMIC via either I2C
> or PWM signals. This driver currently supports only I2C.
>
> Signed-off-by: Tuomas Tynkkynen <[email protected]>
> Signed-off-by: Mikko Perttunen <[email protected]>
> ---
> drivers/clk/tegra/clk-dfll.c | 657
> ++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 654 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
> index 358c5d4..e71f4fb 100644
> --- a/drivers/clk/tegra/clk-dfll.c
> +++ b/drivers/clk/tegra/clk-dfll.c
[snip]
> +/**
> * dfll_fetch_common_params - read DFLL parameters from the device tree
> * @td: DFLL instance
> *
> @@ -923,6 +1563,13 @@ static int dfll_fetch_common_params(struct tegra_dfll
> *td)
> bool ok = true;
>
> ok &= read_dt_param(td, "nvidia,droop-ctrl", &td->droop_ctrl);
> + ok &= read_dt_param(td, "nvidia,sample-rate", &td->sample_rate);
> + ok &= read_dt_param(td, "nvidia,force-mode", &td->force_mode);
> + ok &= read_dt_param(td, "nvidia,cf", &td->cf);
> + ok &= read_dt_param(td, "nvidia,ci", &td->ci);
> + ok &= read_dt_param(td, "nvidia,cg", &td->cg);
> + td->cg_scale = of_property_read_bool(td->dev->of_node,
> + "nvidia,cg-scale");
Oh, I see here you exploit read_dt_param() intensively.
> if (of_property_read_string(td->dev->of_node, "clock-output-names",
> &td->output_clock_name)) {
> @@ -978,6 +1625,10 @@ int tegra_dfll_register(struct platform_device *pdev,
> return ret;
> }
>
> + ret = dfll_fetch_i2c_params(td);
> + if (ret)
> + return ret;
> +
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!mem) {
> dev_err(td->dev, "no control register resource\n");
>
--
With best wishes,
Vladimir
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