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Date:   Wed, 11 Dec 2019 17:34:13 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/15] firmware: arm_scmi: Update scmi_prot_init_fn_t to
 use device instead of handle

On 10/12/2019 14:53, Sudeep Holla wrote:
> The scmi bus now supports multiple device per protocol. So, in order to
> initialise each device and it's attributes, it's better to pass scmi_device
> pointer to the protocol initialise function rather than scmi_handle.
> scmi_handle can be still fetched from the scmi_device pointer.
> 
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/firmware/arm_scmi/bus.c     | 6 +++---
>  drivers/firmware/arm_scmi/clock.c   | 3 ++-
>  drivers/firmware/arm_scmi/perf.c    | 3 ++-
>  drivers/firmware/arm_scmi/power.c   | 3 ++-
>  drivers/firmware/arm_scmi/reset.c   | 3 ++-
>  drivers/firmware/arm_scmi/sensors.c | 3 ++-
>  include/linux/scmi_protocol.h       | 2 +-
>  7 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
> index 3714e6307b05..f619da2634a6 100644
> --- a/drivers/firmware/arm_scmi/bus.c
> +++ b/drivers/firmware/arm_scmi/bus.c
> @@ -51,13 +51,13 @@ static int scmi_dev_match(struct device *dev, struct device_driver *drv)
>  	return 0;
>  }
> 
> -static int scmi_protocol_init(int protocol_id, struct scmi_handle *handle)
> +static int scmi_protocol_init(int protocol_id, struct scmi_device *dev)
>  {
>  	scmi_prot_init_fn_t fn = idr_find(&scmi_protocols, protocol_id);
> 
>  	if (unlikely(!fn))
>  		return -EINVAL;
> -	return fn(handle);
> +	return fn(dev);
>  }
> 

As talked offline, for the same reasons of comments in 03/15, it seems to me
that here we are slipping device specific initialization stuff into the
protocol_init function which should be called once for all for every protocol.

BTW, scmi_dev is used just to extract the handle here, beside version caching
in following patches.

Cheers

Cristian
>  static int scmi_dev_probe(struct device *dev)
> @@ -74,7 +74,7 @@ static int scmi_dev_probe(struct device *dev)
>  	if (!scmi_dev->handle)
>  		return -EPROBE_DEFER;
> 
> -	ret = scmi_protocol_init(scmi_dev->protocol_id, scmi_dev->handle);
> +	ret = scmi_protocol_init(scmi_dev->protocol_id, scmi_dev);
>  	if (ret)
>  		return ret;
> 
> diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
> index 922b22aaaf84..6c24eb8a4e68 100644
> --- a/drivers/firmware/arm_scmi/clock.c
> +++ b/drivers/firmware/arm_scmi/clock.c
> @@ -310,11 +310,12 @@ static struct scmi_clk_ops clk_ops = {
>  	.disable = scmi_clock_disable,
>  };
> 
> -static int scmi_clock_protocol_init(struct scmi_handle *handle)
> +static int scmi_clock_protocol_init(struct scmi_device *dev)
>  {
>  	u32 version;
>  	int clkid, ret;
>  	struct clock_info *cinfo;
> +	struct scmi_handle *handle = dev->handle;
> 
>  	if (handle->clk_ops && handle->clk_priv)
>  		return 0; /* initialised already for the first device */
> diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
> index 55c2a4c21ccb..4f02bfba98ba 100644
> --- a/drivers/firmware/arm_scmi/perf.c
> +++ b/drivers/firmware/arm_scmi/perf.c
> @@ -704,11 +704,12 @@ static struct scmi_perf_ops perf_ops = {
>  	.est_power_get = scmi_dvfs_est_power_get,
>  };
> 
> -static int scmi_perf_protocol_init(struct scmi_handle *handle)
> +static int scmi_perf_protocol_init(struct scmi_device *dev)
>  {
>  	int domain;
>  	u32 version;
>  	struct scmi_perf_info *pinfo;
> +	struct scmi_handle *handle = dev->handle;
> 
>  	if (handle->perf_ops && handle->perf_priv)
>  		return 0; /* initialised already for the first device */
> diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
> index 9a7593238b8f..5a8faa369d82 100644
> --- a/drivers/firmware/arm_scmi/power.c
> +++ b/drivers/firmware/arm_scmi/power.c
> @@ -179,11 +179,12 @@ static struct scmi_power_ops power_ops = {
>  	.state_get = scmi_power_state_get,
>  };
> 
> -static int scmi_power_protocol_init(struct scmi_handle *handle)
> +static int scmi_power_protocol_init(struct scmi_device *dev)
>  {
>  	int domain;
>  	u32 version;
>  	struct scmi_power_info *pinfo;
> +	struct scmi_handle *handle = dev->handle;
> 
>  	if (handle->power_ops && handle->power_priv)
>  		return 0; /* initialised already for the first device */
> diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
> index 809dc8faee1e..438d74a2c80a 100644
> --- a/drivers/firmware/arm_scmi/reset.c
> +++ b/drivers/firmware/arm_scmi/reset.c
> @@ -189,11 +189,12 @@ static struct scmi_reset_ops reset_ops = {
>  	.deassert = scmi_reset_domain_deassert,
>  };
> 
> -static int scmi_reset_protocol_init(struct scmi_handle *handle)
> +static int scmi_reset_protocol_init(struct scmi_device *dev)
>  {
>  	int domain;
>  	u32 version;
>  	struct scmi_reset_info *pinfo;
> +	struct scmi_handle *handle = dev->handle;
> 
>  	if (handle->reset_ops && handle->reset_priv)
>  		return 0; /* initialised already for the first device */
> diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> index b7f92c37c8a4..afa51bedfa5d 100644
> --- a/drivers/firmware/arm_scmi/sensors.c
> +++ b/drivers/firmware/arm_scmi/sensors.c
> @@ -271,10 +271,11 @@ static struct scmi_sensor_ops sensor_ops = {
>  	.reading_get = scmi_sensor_reading_get,
>  };
> 
> -static int scmi_sensors_protocol_init(struct scmi_handle *handle)
> +static int scmi_sensors_protocol_init(struct scmi_device *dev)
>  {
>  	u32 version;
>  	struct sensors_info *sinfo;
> +	struct scmi_handle *handle = dev->handle;
> 
>  	if (handle->sensor_ops && handle->sensor_priv)
>  		return 0; /* initialised already for the first device */
> diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
> index 5c873a59b387..b676825e6eb0 100644
> --- a/include/linux/scmi_protocol.h
> +++ b/include/linux/scmi_protocol.h
> @@ -316,6 +316,6 @@ static inline void scmi_driver_unregister(struct scmi_driver *driver) {}
>  #define module_scmi_driver(__scmi_driver)	\
>  	module_driver(__scmi_driver, scmi_register, scmi_unregister)
> 
> -typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
> +typedef int (*scmi_prot_init_fn_t)(struct scmi_device *);
>  int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
>  void scmi_protocol_unregister(int protocol_id);
> --
> 2.17.1
>

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