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Date: Tue, 2 Jun 2020 07:28:13 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Sandipan Patra <spatra@...dia.com>
Cc: treding@...dia.com, jonathanh@...dia.com, kamil@...as.org,
jdelvare@...e.com, robh+dt@...nel.org,
u.kleine-koenig@...gutronix.de, bbasu@...dia.com,
bbiswas@...dia.com, kyarlagadda@...dia.com,
linux-pwm@...r.kernel.org, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/2] hwmon: pwm-fan: Add profile support and add
remove module support
On Mon, Jun 01, 2020 at 11:49:13AM +0530, Sandipan Patra wrote:
> Add support for profiles mode settings.
> This allows different fan settings for trip point temp/hyst/pwm.
> Tegra194 has multiple fan-profiles support.
>
> Signed-off-by: Sandipan Patra <spatra@...dia.com>
The subject says "remove module support". What is this supposed to be
about ?
The code adds support for multiple cooling "profiles" but, unless I am
really missing something, no means to actually select a profile.
This adds a lot of complexity to the code with zero value.
Either case, and I may have mentioned this before, functionality like this
should really reside in the thermal core and not in individual drivers.
> ---
>
> PATCH V2:
> Cleaned pwm_fan_remove support as it is not required.
>
> drivers/hwmon/pwm-fan.c | 92 ++++++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 80 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> index 30b7b3e..1d2a416 100644
> --- a/drivers/hwmon/pwm-fan.c
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -3,8 +3,10 @@
> * pwm-fan.c - Hwmon driver for fans connected to PWM lines.
> *
> * Copyright (c) 2014 Samsung Electronics Co., Ltd.
> + * Copyright (c) 2020, NVIDIA Corporation.
> *
> * Author: Kamil Debski <k.debski@...sung.com>
> + * Author: Sandipan Patra <spatra@...dia.com>
You can not claim authorship for a driver by adding a few lines of code
to it.
> */
>
> #include <linux/hwmon.h>
> @@ -21,6 +23,8 @@
> #include <linux/timer.h>
>
> #define MAX_PWM 255
> +/* Based on OF max device tree node name length */
> +#define MAX_PROFILE_NAME_LENGTH 31
>
> struct pwm_fan_ctx {
> struct mutex lock;
> @@ -38,6 +42,12 @@ struct pwm_fan_ctx {
> unsigned int pwm_fan_state;
> unsigned int pwm_fan_max_state;
> unsigned int *pwm_fan_cooling_levels;
> +
> + unsigned int pwm_fan_profiles;
> + const char **fan_profile_names;
> + unsigned int **fan_profile_cooling_levels;
> + unsigned int fan_current_profile;
> +
> struct thermal_cooling_device *cdev;
> };
>
> @@ -227,28 +237,86 @@ static int pwm_fan_of_get_cooling_data(struct device *dev,
> struct pwm_fan_ctx *ctx)
> {
> struct device_node *np = dev->of_node;
> + struct device_node *base_profile = NULL;
> + struct device_node *profile_np = NULL;
> + const char *default_profile = NULL;
> int num, i, ret;
>
> - if (!of_find_property(np, "cooling-levels", NULL))
> - return 0;
> + num = of_property_count_u32_elems(np, "cooling-levels");
> + if (num <= 0) {
> + base_profile = of_get_child_by_name(np, "profiles");
You can not just add new properties like this without documenting it
and getting approval by devicetree maintainers.
Guenter
> + if (!base_profile) {
> + dev_err(dev, "Wrong Data\n");
> + return -EINVAL;
> + }
> + }
> +
> + if (base_profile) {
> + ctx->pwm_fan_profiles =
> + of_get_available_child_count(base_profile);
>
> - ret = of_property_count_u32_elems(np, "cooling-levels");
> - if (ret <= 0) {
> - dev_err(dev, "Wrong data!\n");
> - return ret ? : -EINVAL;
> + if (ctx->pwm_fan_profiles <= 0) {
> + dev_err(dev, "Profiles used but not defined\n");
> + return -EINVAL;
> + }
> +
> + ctx->fan_profile_names = devm_kzalloc(dev,
> + sizeof(const char *) * ctx->pwm_fan_profiles,
> + GFP_KERNEL);
> + ctx->fan_profile_cooling_levels = devm_kzalloc(dev,
> + sizeof(int *) * ctx->pwm_fan_profiles,
> + GFP_KERNEL);
> +
> + if (!ctx->fan_profile_names
> + || !ctx->fan_profile_cooling_levels)
> + return -ENOMEM;
> +
> + ctx->fan_current_profile = 0;
> + i = 0;
> + for_each_available_child_of_node(base_profile, profile_np) {
> + num = of_property_count_u32_elems(profile_np,
> + "cooling-levels");
> + if (num <= 0) {
> + dev_err(dev, "No data in cooling-levels inside profile node!\n");
> + return -EINVAL;
> + }
> +
> + of_property_read_string(profile_np, "name",
> + &ctx->fan_profile_names[i]);
> + if (default_profile &&
> + !strncmp(default_profile,
> + ctx->fan_profile_names[i],
> + MAX_PROFILE_NAME_LENGTH))
> + ctx->fan_current_profile = i;
> +
> + ctx->fan_profile_cooling_levels[i] =
> + devm_kzalloc(dev, sizeof(int) * num,
> + GFP_KERNEL);
> + if (!ctx->fan_profile_cooling_levels[i])
> + return -ENOMEM;
> +
> + of_property_read_u32_array(profile_np, "cooling-levels",
> + ctx->fan_profile_cooling_levels[i], num);
> + i++;
> + }
> }
>
> - num = ret;
> ctx->pwm_fan_cooling_levels = devm_kcalloc(dev, num, sizeof(u32),
> GFP_KERNEL);
> if (!ctx->pwm_fan_cooling_levels)
> return -ENOMEM;
>
> - ret = of_property_read_u32_array(np, "cooling-levels",
> - ctx->pwm_fan_cooling_levels, num);
> - if (ret) {
> - dev_err(dev, "Property 'cooling-levels' cannot be read!\n");
> - return ret;
> + if (base_profile) {
> + memcpy(ctx->pwm_fan_cooling_levels,
> + ctx->fan_profile_cooling_levels[ctx->fan_current_profile],
> + num);
> + } else {
> + ret = of_property_read_u32_array(np, "cooling-levels",
> + ctx->pwm_fan_cooling_levels, num);
> + if (ret) {
> + dev_err(dev, "Property 'cooling-levels' cannot be read!\n");
> + return -EINVAL;
> + }
> }
>
> for (i = 0; i < num; i++) {
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