linux-kernel - Re: [PATCH v14 01/10] spmi: add a helper to look up an SPMI device from a device node

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Message-ID: <20220501182323.7b672d8a@jic23-huawei>
Date:   Sun, 1 May 2022 18:23:23 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH v14 01/10] spmi: add a helper to look up an SPMI device
 from a device node

On Fri, 29 Apr 2022 23:08:56 +0100
Caleb Connolly <caleb.connolly@...aro.org> wrote:

> The helper function spmi_device_from_of() takes a device node and
> returns the SPMI device associated with it.
> This is like of_find_device_by_node but for SPMI devices.
> 
> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org> 

Stephen, are you fine with this addition to spmi?

Given bulk of this series in in IIO I'm planning to pick up once
everyone is happy with it.

Thanks,

Jonathan


> ---
>  drivers/spmi/spmi.c  | 17 +++++++++++++++++
>  include/linux/spmi.h |  3 +++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
> index b37ead9e2fad..a456ce5141e1 100644
> --- a/drivers/spmi/spmi.c
> +++ b/drivers/spmi/spmi.c
> @@ -386,6 +386,23 @@ static struct bus_type spmi_bus_type = {
>  	.uevent		= spmi_drv_uevent,
>  };
>  
> +/**
> + * spmi_device_from_of() - get the associated SPMI device from a device node
> + *
> + * @np:		device node
> + *
> + * Returns the struct spmi_device associated with a device node or NULL.
> + */
> +struct spmi_device *spmi_device_from_of(struct device_node *np)
> +{
> +	struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
> +
> +	if (dev)
> +		return to_spmi_device(dev);
> +	return NULL;
> +}
> +EXPORT_SYMBOL_GPL(spmi_device_from_of);
> +
>  /**
>   * spmi_controller_alloc() - Allocate a new SPMI device
>   * @ctrl:	associated controller
> diff --git a/include/linux/spmi.h b/include/linux/spmi.h
> index 729bcbf9f5ad..eac1956a8727 100644
> --- a/include/linux/spmi.h
> +++ b/include/linux/spmi.h
> @@ -164,6 +164,9 @@ static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
>  	module_driver(__spmi_driver, spmi_driver_register, \
>  			spmi_driver_unregister)
>  
> +struct device_node;
> +
> +struct spmi_device *spmi_device_from_of(struct device_node *np);
>  int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
>  int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
>  			   size_t len);