From: Chanwoo Choi <chanwoo@kernel.org>
To: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: "Georgi Djakov" <georgi.djakov@linaro.org>,
"Chanwoo Choi" <cw00.choi@samsung.com>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Artur Świgoń" <a.swigon@samsung.com>,
"MyungJoo Ham" <myungjoo.ham@samsung.com>,
inki.dae@samsung.com, "Seung-Woo Kim" <sw0312.kim@samsung.com>,
"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device
Date: Sun, 31 May 2020 08:57:54 +0900 [thread overview]
Message-ID: <CAGTfZH1KC=jpQ5GXNtEf1cn7+WqXJdqbbVKmpxr8Snh4GEy8bA@mail.gmail.com> (raw)
In-Reply-To: <20200529163200.18031-4-s.nawrocki@samsung.com>
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
next prev parent reply other threads:[~2020-05-30 23:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200529163213eucas1p1ac148f9238214ac84f3d0cc199c4398b@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 0/6] Exynos: Simple QoS for exynos-bus using interconnect Sylwester Nawrocki
[not found] ` <CGME20200529163219eucas1p2d127fe3936921f53f6fe7902e7d14a3e@eucas1p2.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties Sylwester Nawrocki
2020-05-31 0:01 ` Chanwoo Choi
2020-06-01 9:40 ` Sylwester Nawrocki
2020-06-01 8:19 ` Sylwester Nawrocki
2020-06-02 8:05 ` Krzysztof Kozlowski
[not found] ` <CGME20200529163223eucas1p2f663280abb499b4114b2f2930b43a4e5@eucas1p2.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 2/6] interconnect: Add generic interconnect driver for Exynos SoCs Sylwester Nawrocki
2020-05-31 0:13 ` Chanwoo Choi
2020-06-01 9:57 ` Sylwester Nawrocki
2020-06-02 8:21 ` Krzysztof Kozlowski
2020-06-03 9:24 ` Sylwester Nawrocki
2020-07-01 12:50 ` Georgi Djakov
2020-07-02 12:01 ` Sylwester Nawrocki
2020-07-02 12:33 ` Georgi Djakov
2020-07-02 14:24 ` Sylwester Nawrocki
[not found] ` <CGME20200529163225eucas1p1cfb2233c869dcc3dab84b754bbce17b6@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device Sylwester Nawrocki
2020-05-30 23:57 ` Chanwoo Choi [this message]
2020-06-01 10:04 ` Sylwester Nawrocki
2020-06-02 0:50 ` Chanwoo Choi
[not found] ` <CGME20200529163226eucas1p15bea74bed9cc5d22727c9ba732a5cbb9@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 4/6] ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes Sylwester Nawrocki
2020-05-31 0:02 ` Chanwoo Choi
[not found] ` <CGME20200529163228eucas1p1d05340fef9ffc724f5d3d9f5709a600f@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 5/6] ARM: dts: exynos: Add interconnects to Exynos4412 mixer Sylwester Nawrocki
2020-05-31 0:07 ` Chanwoo Choi
[not found] ` <CGME20200529163229eucas1p2ee6394f184e5eba12599559f8a621fde@eucas1p2.samsung.com>
2020-05-29 16:32 ` [RFC PATCH v5 6/6] drm: exynos: mixer: Add interconnect support Sylwester Nawrocki
2020-06-01 7:58 ` Chanwoo Choi
2020-06-03 10:04 ` Sylwester Nawrocki
2020-06-01 8:17 ` [RFC PATCH v5 0/6] Exynos: Simple QoS for exynos-bus using interconnect Sylwester Nawrocki
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