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SubjectRe: [PATCH v4 2/3] OPP: Add support for bandwidth OPP tables
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Hi Saravana,

On 7/27/19 02:15, Saravana Kannan wrote:
> Not all devices quantify their performance points in terms of frequency.
> Devices like interconnects quantify their performance points in terms of
> bandwidth. We need a way to represent these bandwidth levels in OPP. So,
> add support for parsing bandwidth OPPs from DT.
>
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> ---
> drivers/opp/of.c | 41 ++++++++++++++++++++++++++++++++---------
> drivers/opp/opp.h | 4 +++-
> 2 files changed, 35 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index b313aca9894f..ac73512f4416 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -523,6 +523,35 @@ void dev_pm_opp_of_remove_table(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
>
> +static int _read_opp_key(struct dev_pm_opp *new_opp, struct device_node *np)
> +{
> + int ret;
> + u64 rate;
> + u32 bw;
> +
> + ret = of_property_read_u64(np, "opp-hz", &rate);
> + if (!ret) {
> + /*
> + * Rate is defined as an unsigned long in clk API, and so
> + * casting explicitly to its type. Must be fixed once rate is 64
> + * bit guaranteed in clk API.
> + */
> + new_opp->rate = (unsigned long)rate;
> + return 0;

So we can't have a single OPP table with both frequency and bandwidth?

> + }
> +
> + ret = of_property_read_u32(np, "opp-peak-KBps", &bw);
> + if (ret)
> + return ret;
> + new_opp->rate = (unsigned long) bw;
> +
> + ret = of_property_read_u32(np, "opp-avg-KBps", &bw);
> + if (!ret)
> + new_opp->avg_bw = (unsigned long) bw;
> +
> + return 0;
> +}
> +
> /**
> * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
> * @opp_table: OPP table
> @@ -560,22 +589,16 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
> if (!new_opp)
> return ERR_PTR(-ENOMEM);
>
> - ret = of_property_read_u64(np, "opp-hz", &rate);
> + ret = _read_opp_key(new_opp, np);
> if (ret < 0) {
> /* "opp-hz" is optional for devices like power domains. */
> if (!opp_table->is_genpd) {
> - dev_err(dev, "%s: opp-hz not found\n", __func__);
> + dev_err(dev, "%s: opp-hz or opp-peak-bw not found\n",

s/opp-peak-bw/opp-peak-kBps/

Thanks,
Georgi

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