linux-kernel - Re: [PATCH] Input: synaptics-rmi4: Support regulator supplies

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Date:	Thu, 31 Mar 2016 11:19:05 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Andrew Duggan <aduggan@...aptics.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: [PATCH] Input: synaptics-rmi4: Support regulator supplies

Hi Bjorn,

On Wed, Mar 30, 2016 at 09:57:29AM -0700, Bjorn Andersson wrote:
> From: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> 
> Support the two supplies - vdd and vio - to make it possible to control
> power to the Synaptics chip.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  .../devicetree/bindings/input/rmi4/rmi_i2c.txt     |  7 ++++
>  drivers/input/rmi4/rmi_i2c.c                       | 45 ++++++++++++++++++++++

Would not we need pretty much the same changes for SPI devices? Can this
be done in core?

Thanks.

>  2 files changed, 52 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
> index 95fa715c6046..a8c31f40f816 100644
> --- a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
> +++ b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
> @@ -22,6 +22,13 @@ See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
>  - syna,reset-delay-ms: The number of milliseconds to wait after resetting the
>  			device.
>  
> +- vdd-supply: VDD power supply.
> +See Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +- vio-supply: VIO power supply
> +See Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +
>  Function Parameters:
>  Parameters specific to RMI functions are contained in child nodes of the rmi device
>   node. Documentation for the parameters of each function can be found in:
> diff --git a/drivers/input/rmi4/rmi_i2c.c b/drivers/input/rmi4/rmi_i2c.c
> index a96a326b53bd..a8c794daba04 100644
> --- a/drivers/input/rmi4/rmi_i2c.c
> +++ b/drivers/input/rmi4/rmi_i2c.c
> @@ -11,6 +11,8 @@
>  #include <linux/rmi.h>
>  #include <linux/irq.h>
>  #include <linux/of.h>
> +#include <linux/delay.h>
> +#include <linux/regulator/consumer.h>
>  #include "rmi_driver.h"
>  
>  #define BUFFER_SIZE_INCREMENT 32
> @@ -37,6 +39,8 @@ struct rmi_i2c_xport {
>  
>  	u8 *tx_buf;
>  	size_t tx_buf_size;
> +
> +	struct regulator_bulk_data supplies[2];
>  };
>  
>  #define RMI_PAGE_SELECT_REGISTER 0xff
> @@ -246,6 +250,22 @@ static int rmi_i2c_probe(struct i2c_client *client,
>  		return -ENODEV;
>  	}
>  
> +	rmi_i2c->supplies[0].supply = "vdd";
> +	rmi_i2c->supplies[1].supply = "vio";
> +	retval = devm_regulator_bulk_get(&client->dev,
> +					 ARRAY_SIZE(rmi_i2c->supplies),
> +					 rmi_i2c->supplies);
> +	if (retval < 0)
> +		return retval;
> +
> +	retval = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
> +				       rmi_i2c->supplies);
> +	if (retval < 0)
> +		return retval;
> +
> +	/* Allow the firmware to get ready */
> +	msleep(10);
> +
>  	rmi_i2c->client = client;
>  	mutex_init(&rmi_i2c->page_mutex);
>  
> @@ -286,6 +306,8 @@ static int rmi_i2c_remove(struct i2c_client *client)
>  	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
>  
>  	rmi_unregister_transport_device(&rmi_i2c->xport);
> +	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
> +			       rmi_i2c->supplies);
>  
>  	return 0;
>  }
> @@ -308,6 +330,10 @@ static int rmi_i2c_suspend(struct device *dev)
>  			dev_warn(dev, "Failed to enable irq for wake: %d\n",
>  				ret);
>  	}
> +
> +	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
> +			       rmi_i2c->supplies);
> +
>  	return ret;
>  }
>  
> @@ -317,6 +343,14 @@ static int rmi_i2c_resume(struct device *dev)
>  	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
>  	int ret;
>  
> +	ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
> +				    rmi_i2c->supplies);
> +	if (ret)
> +		return ret;
> +
> +	/* Allow the firmware to get ready */
> +	msleep(10);
> +
>  	enable_irq(rmi_i2c->irq);
>  	if (device_may_wakeup(&client->dev)) {
>  		ret = disable_irq_wake(rmi_i2c->irq);
> @@ -346,6 +380,9 @@ static int rmi_i2c_runtime_suspend(struct device *dev)
>  
>  	disable_irq(rmi_i2c->irq);
>  
> +	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
> +			       rmi_i2c->supplies);
> +
>  	return 0;
>  }
>  
> @@ -355,6 +392,14 @@ static int rmi_i2c_runtime_resume(struct device *dev)
>  	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
>  	int ret;
>  
> +	ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
> +				    rmi_i2c->supplies);
> +	if (ret)
> +		return ret;
> +
> +	/* Allow the firmware to get ready */
> +	msleep(10);
> +
>  	enable_irq(rmi_i2c->irq);
>  
>  	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
> -- 
> 2.5.0
> 

-- 
Dmitry