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Message-ID: <CAPDyKFozvt-LdxwkCB9C+t-mR-CZ37HigsB88z9Tj_SzKfRBLg@mail.gmail.com>
Date: Tue, 4 Feb 2020 17:22:31 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Thara Gopinath <thara.gopinath@...aro.org>
Cc: Eduardo Valentin <edubezval@...il.com>,
Zhang Rui <rui.zhang@...el.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Andy Gross <agross@...nel.org>,
Amit Kucheria <amit.kucheria@...durent.com>,
Mark Rutland <mark.rutland@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Linux PM <linux-pm@...r.kernel.org>,
DTML <devicetree@...r.kernel.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Patch v4 3/7] thermal: core: Allow cooling devices to register a parent.
On Wed, 20 Nov 2019 at 13:56, Thara Gopinath <thara.gopinath@...aro.org> wrote:
>
> With introduction of power domain warming devices, devices that control the
> power domain are registered as the parent of the cooling device so that the
> device-genpd hierarchy in kernel is maintained intact. To enable this,
> introduce a new API thermal_of_cooling_device_parent_register that takes a
> parent device pointer as input. Also, modify
> __thermal_cooling_device_register to register parent of a newly created
> cooling device, if specified.
I am not sure I understand the reasons why you need this, can you
please elaborate?
I remember we talked about using a "parent" device to deal with device
attaching to PM domains (genpd). However, since the DT bindings for
"warming devices" was concluded to consist by a single property
("#cooling-cells") as a part of the PM domain provider node, this
seems not to be needed.
By looking at patch 4/7, you are attaching devices via
of_genpd_add_device() and I don't see any need for using a "parent" in
there.
Can $subject patch be dropped or what am I missing?
Kind regards
Uffe
>
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
> drivers/thermal/thermal_core.c | 22 +++++++++++++++++++---
> include/linux/thermal.h | 15 +++++++++++++++
> 2 files changed, 34 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index d4481cc..912ba75 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -947,6 +947,7 @@ static void bind_cdev(struct thermal_cooling_device *cdev)
> */
> static struct thermal_cooling_device *
> __thermal_cooling_device_register(struct device_node *np,
> + struct device *parent,
> const char *type, void *devdata,
> const struct thermal_cooling_device_ops *ops)
> {
> @@ -979,6 +980,8 @@ __thermal_cooling_device_register(struct device_node *np,
> cdev->ops = ops;
> cdev->updated = false;
> cdev->device.class = &thermal_class;
> + if (parent)
> + cdev->device.parent = parent;
> cdev->devdata = devdata;
> thermal_cooling_device_setup_sysfs(cdev);
> dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
> @@ -1024,7 +1027,8 @@ struct thermal_cooling_device *
> thermal_cooling_device_register(const char *type, void *devdata,
> const struct thermal_cooling_device_ops *ops)
> {
> - return __thermal_cooling_device_register(NULL, type, devdata, ops);
> + return __thermal_cooling_device_register(NULL, NULL, type,
> + devdata, ops);
> }
> EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
>
> @@ -1048,10 +1052,22 @@ thermal_of_cooling_device_register(struct device_node *np,
> const char *type, void *devdata,
> const struct thermal_cooling_device_ops *ops)
> {
> - return __thermal_cooling_device_register(np, type, devdata, ops);
> + return __thermal_cooling_device_register(np, NULL, type, devdata, ops);
> }
> EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
>
> +struct thermal_cooling_device *
> +thermal_of_cooling_device_parent_register(struct device_node *np,
> + struct device *parent,
> + const char *type, void *devdata,
> + const struct
> + thermal_cooling_device_ops *ops)
> +{
> + return __thermal_cooling_device_register(np, parent, type,
> + devdata, ops);
> +}
> +EXPORT_SYMBOL_GPL(thermal_of_cooling_device_parent_register);
> +
> static void thermal_cooling_device_release(struct device *dev, void *res)
> {
> thermal_cooling_device_unregister(
> @@ -1088,7 +1104,7 @@ devm_thermal_of_cooling_device_register(struct device *dev,
> if (!ptr)
> return ERR_PTR(-ENOMEM);
>
> - tcd = __thermal_cooling_device_register(np, type, devdata, ops);
> + tcd = __thermal_cooling_device_register(np, NULL, type, devdata, ops);
> if (IS_ERR(tcd)) {
> devres_free(ptr);
> return tcd;
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index e45659c..ac5f268 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -448,6 +448,11 @@ struct thermal_cooling_device *
> thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
> const struct thermal_cooling_device_ops *);
> struct thermal_cooling_device *
> +thermal_of_cooling_device_parent_register(struct device_node *np,
> + struct device *parent,
> + const char *, void *, const struct
> + thermal_cooling_device_ops *);
> +struct thermal_cooling_device *
> devm_thermal_of_cooling_device_register(struct device *dev,
> struct device_node *np,
> char *type, void *devdata,
> @@ -508,6 +513,16 @@ static inline struct thermal_cooling_device *
> thermal_of_cooling_device_register(struct device_node *np,
> char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
> { return ERR_PTR(-ENODEV); }
> +
> +static inline struct thermal_cooling_device *
> +thermal_of_cooling_device_parent_register(struct device_node *np,
> + struct device *parent,
> + const char *, void *, const struct
> + thermal_cooling_device_ops *)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> static inline struct thermal_cooling_device *
> devm_thermal_of_cooling_device_register(struct device *dev,
> struct device_node *np,
> --
> 2.1.4
>
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