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SubjectRe: [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device
Hi Sylwester,

On Sat, May 30, 2020 at 1:33 AM Sylwester Nawrocki
<s.nawrocki@samsung.com> wrote:
>
> This patch adds registration of a child platform device for the exynos
> interconnect driver. It is assumed that the interconnect provider will
> only be needed when #interconnect-cells property is present in the bus
> DT node, hence the child device will be created only when such a property
> is present.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>
> Changes for v5:
> - new patch.
> ---
> drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 8fa8eb5..856e37d 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -24,6 +24,7 @@
>
> struct exynos_bus {
> struct device *dev;
> + struct platform_device *icc_pdev;
>
> struct devfreq *devfreq;
> struct devfreq_event_dev **edev;
> @@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev)
> if (ret < 0)
> dev_warn(dev, "failed to disable the devfreq-event devices\n");
>
> + platform_device_unregister(bus->icc_pdev);
> +
> dev_pm_opp_of_remove_table(dev);
> clk_disable_unprepare(bus->clk);
> if (bus->opp_table) {
> @@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev)
> {
> struct exynos_bus *bus = dev_get_drvdata(dev);
>
> + platform_device_unregister(bus->icc_pdev);
> +
> dev_pm_opp_of_remove_table(dev);
> clk_disable_unprepare(bus->clk);
> }
> @@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
> if (ret < 0)
> goto err;
>
> + /* Create child platform device for the interconnect provider */
> + if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
> + bus->icc_pdev = platform_device_register_data(
> + dev, "exynos-generic-icc",
> + PLATFORM_DEVID_AUTO, NULL, 0);
> +
> + if (IS_ERR(bus->icc_pdev)) {
> + ret = PTR_ERR(bus->icc_pdev);
> + goto err;
> + }
> + }
> +
> max_state = bus->devfreq->profile->max_state;
> min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
> max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
> --
> 2.7.4
>

It looks like very similar like the registering the interconnect
device of imx-bus.c
and I already reviewed and agreed this approach.

Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

nitpick: IMHO, I think that 'exynos-icc' is proper and simple without
'generic' word.
If we need to add new icc compatible int the future, we will add
'exynosXXXX-icc' new compatible.
But, I'm not forcing it. just opinion. Anyway, I agree this approach.

--
Best Regards,
Chanwoo Choi
Samsung Electronics

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