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Date: Fri, 17 Dec 2021 07:26:51 +0100
From: Peter Rosin <peda@...ntia.se>
To: Aswath Govindraju <a-govindraju@...com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Rob Herring <robh+dt@...nel.org>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Vignesh Raghavendra <vigneshr@...com>,
Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v2 0/2] MUX: Add support for mux-states
Hi again.
On 2021-12-17 06:57, Peter Rosin wrote:
> Hi Aswath!
>
> On 2021-12-02 13:40, Aswath Govindraju wrote:
>> The following series of patches add support for reading mux
>> state from the device tree.
>>
>> changes since v1:
>> - Made grammer corrections and added more information
>> on the usage for mux-states and mux-controls
>>
>> Aswath Govindraju (2):
>> dt-bindings: mux: Document mux-states property
>> mux: Add support for reading mux state from consumer DT node
>>
>> .../devicetree/bindings/mux/gpio-mux.yaml | 11 +-
>> .../devicetree/bindings/mux/mux-consumer.yaml | 21 ++
>> .../bindings/mux/mux-controller.yaml | 26 ++-
>> drivers/mux/core.c | 219 ++++++++++++++++--
>> include/linux/mux/consumer.h | 19 +-
>> 5 files changed, 271 insertions(+), 25 deletions(-)
>>
>
> I finally found some time to have a last look at this (fingers crossed) and
> pushed it out for testing in linux-next.
>
> I did end up squashing in these trivial changes in patch 2/2, I hope that's
> fine with you. Just holler if not...
>
> Cheers,
> Peter
>
> diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
> index 148e19381b79..5018403fe82f 100644
> --- a/Documentation/driver-api/driver-model/devres.rst
> +++ b/Documentation/driver-api/driver-model/devres.rst
> @@ -368,6 +368,7 @@ MUX
> devm_mux_chip_alloc()
> devm_mux_chip_register()
> devm_mux_control_get()
> + devm_mux_state_get()
>
> NET
> devm_alloc_etherdev()
> diff --git a/drivers/mux/core.c b/drivers/mux/core.c
> index 7355c5ad41f7..bf448069ca85 100644
> --- a/drivers/mux/core.c
> +++ b/drivers/mux/core.c
> @@ -30,12 +30,13 @@
> #define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS
>
> /**
> - * struct mux_state - Represents a mux controller specific to a given device
> - * @mux: Pointer to a mux controller
> - * @state State of the mux to be set
> + * struct mux_state - Represents a mux controller state specific to a given
> + * consumer.
> + * @mux: Pointer to a mux controller.
> + * @state State of the mux to be selected.
> *
> - * This structure is specific to a device that acquires it and has information
> - * specific to the device.
> + * This structure is specific to the consumer that acquires it and has
> + * information specific to that consumer.
> */
> struct mux_state {
> struct mux_control *mux;
> @@ -354,7 +355,8 @@ static void mux_control_delay(struct mux_control *mux, unsigned int delay_us)
> * On successfully selecting the mux-control state, it will be locked until
> * there is a call to mux_control_deselect(). If the mux-control is already
> * selected when mux_control_select() is called, the caller will be blocked
> - * until mux_control_deselect() is called (by someone else).
> + * until mux_control_deselect() or mux_state_deselect() is called (by someone
> + * else).
> *
> * Therefore, make sure to call mux_control_deselect() when the operation is
> * complete and the mux-control is free for others to use, but do not call
> @@ -384,16 +386,15 @@ int mux_control_select_delay(struct mux_control *mux, unsigned int state,
> EXPORT_SYMBOL_GPL(mux_control_select_delay);
>
> /**
> - * mux_state_select_delay() - Select mux-state
> - * @mstate: The mux-state to select
> - * @delay_us: The time to delay (in microseconds) if the mux control
> - * changes state on select
> + * mux_state_select_delay() - Select the given multiplexer state.
> + * @mstate: The mux-state to select.
> + * @delay_us: The time to delay (in microseconds) if the mux state is changed.
> *
> - * On successfully selecting the mux-state, it will be locked until
> - * there is a call to mux_state_deselect() or mux_control_deselect().
> - * If the mux-control is already selected when mux_state_select() is
> - * called, the caller will be blocked until mux_state_deselect() or
> - * mux_control_deselect() is called (by someone else).
> + * On successfully selecting the mux-state, its mux-control will be locked
> + * until there is a call to mux_state_deselect(). If the mux-control is already
> + * selected when mux_state_select() is called, the caller will be blocked
> + * until mux_state_deselect() or mux_control_deselect() is called (by someone
> + * else).
> *
> * Therefore, make sure to call mux_state_deselect() when the operation is
> * complete and the mux-control is free for others to use, but do not call
> @@ -415,7 +416,7 @@ EXPORT_SYMBOL_GPL(mux_state_select_delay);
> * @delay_us: The time to delay (in microseconds) if the mux state is changed.
> *
> * On successfully selecting the mux-control state, it will be locked until
> - * mux_control_deselect() or mux_state_deselect() called.
> + * mux_control_deselect() called.
> *
> * Therefore, make sure to call mux_control_deselect() when the operation is
> * complete and the mux-control is free for others to use, but do not call
> @@ -444,12 +445,12 @@ int mux_control_try_select_delay(struct mux_control *mux, unsigned int state,
> EXPORT_SYMBOL_GPL(mux_control_try_select_delay);
>
> /**
> - * mux_state_try_select_delay() - Try to select the mux-state.
> - * @mstate: The mux-state to select
> + * mux_state_try_select_delay() - Try to select the given multiplexer state.
> + * @mstate: The mux-state to select.
> * @delay_us: The time to delay (in microseconds) if the mux state is changed.
> *
> - * On successfully selecting the mux-state, it will be locked until
> - * mux_state_deselect() or mux_control_deselect() is called.
> + * On successfully selecting the mux-state, its mux-control will be locked
> + * until mux_state_deselect() is called.
> *
> * Therefore, make sure to call mux_state_deselect() when the operation is
> * complete and the mux-control is free for others to use, but do not call
> @@ -642,26 +643,6 @@ static void devm_mux_control_release(struct device *dev, void *res)
> mux_control_put(mux);
> }
>
> -/**
> - * mux_state_put() - Put away the mux-state for good.
> - * @mstate: The mux-state to put away.
> - *
> - * mux_control_put() reverses the effects of mux_control_get().
> - */
> -void mux_state_put(struct mux_state *mstate)
> -{
> - mux_control_put(mstate->mux);
> - kfree(mstate);
> -}
> -EXPORT_SYMBOL_GPL(mux_state_put);
> -
> -static void devm_mux_state_release(struct device *dev, void *res)
> -{
> - struct mux_state *mstate = *(struct mux_state **)res;
> -
> - mux_state_put(mstate);
> -}
> -
> /**
> * devm_mux_control_get() - Get the mux-control for a device, with resource
> * management.
> @@ -692,6 +673,26 @@ struct mux_control *devm_mux_control_get(struct device *dev,
> }
> EXPORT_SYMBOL_GPL(devm_mux_control_get);
>
> +/**
> + * mux_state_put() - Put away the mux-state for good.
> + * @mstate: The mux-state to put away.
> + *
> + * mux_control_put() reverses the effects of mux_control_get().
And, a couple of minutes later, I squashed in this on top:
- * mux_control_put() reverses the effects of mux_control_get().
+ * mux_state_put() reverses the effects of mux_state_get().
Cheers,
Peter
> + */
> +void mux_state_put(struct mux_state *mstate)
> +{
> + mux_control_put(mstate->mux);
> + kfree(mstate);
> +}
> +EXPORT_SYMBOL_GPL(mux_state_put);
> +
> +static void devm_mux_state_release(struct device *dev, void *res)
> +{
> + struct mux_state *mstate = *(struct mux_state **)res;
> +
> + mux_state_put(mstate);
> +}
> +
> /**
> * devm_mux_state_get() - Get the mux-state for a device, with resource
> * management.
> diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
> index bf5abf062c21..babf2a744056 100644
> --- a/include/linux/mux/consumer.h
> +++ b/include/linux/mux/consumer.h
> @@ -27,6 +27,7 @@ int __must_check mux_control_try_select_delay(struct mux_control *mux,
> unsigned int delay_us);
> int __must_check mux_state_try_select_delay(struct mux_state *mstate,
> unsigned int delay_us);
> +
> static inline int __must_check mux_control_select(struct mux_control *mux,
> unsigned int state)
> {
> @@ -37,6 +38,7 @@ static inline int __must_check mux_state_select(struct mux_state *mstate)
> {
> return mux_state_select_delay(mstate, 0);
> }
> +
> static inline int __must_check mux_control_try_select(struct mux_control *mux,
> unsigned int state)
> {
>
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