linux-kernel - Re: [PATCH v3] sm501: Add device property

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Message-ID: <877fcync4x.wl-ysato@users.sourceforge.jp>
Date:	Wed, 06 Jul 2016 22:12:46 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Rob Herring <robh+dt@...nel.org>, Lee Jones <lee.jones@...aro.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] sm501: Add device property

On Mon, 04 Jul 2016 23:40:43 +0900,
Mark Rutland wrote:
> 
> On Mon, Jul 04, 2016 at 11:26:04PM +0900, Yoshinori Sato wrote:
> > Add device proptery on enable integrated peripheral.
> > It have platform_data. But don't have devicetree.
> > 
> > Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > ---
> >  .../devicetree/bindings/display/sm501fb.txt        | 11 +++++++++
> >  drivers/mfd/sm501.c                                | 28 +++++++++++++---------
> >  2 files changed, 28 insertions(+), 11 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/sm501fb.txt b/Documentation/devicetree/bindings/display/sm501fb.txt
> > index 9d9f009..9290094 100644
> > --- a/Documentation/devicetree/bindings/display/sm501fb.txt
> > +++ b/Documentation/devicetree/bindings/display/sm501fb.txt
> > @@ -22,6 +22,17 @@ Optional properties:
> >    set different foreign endian.
> >  - big-endian: available on little endian systems, to
> >    set different foreign endian.
> > +- smi,devices: function block enable bitmap.
> > +	bit0: USB host
> > +	bit1: USB slave
> > +	bit2: SSP Ch0
> > +	bit3: SSP Ch1
> > +	bit4: UART Ch0
> > +	bit5: UART Ch1
> > +	bit6: Accelerator
> > +	bit7: AC97
> > +	bit8: I2S
> > +	bit9: GPIO
> 
> Generally we don't place bitmaps like this in DT.
> 
> What exactly does this property represent? Whether certain sub-blocks
> are present?
> 
> These should probably be separate has-${FOO} proeprties. It may be
> better to have separate nodes, if we'e going to need to refer to sub
> blocks by phandle, or are liekly to have peropties specific to a sub
> block.

Hmm...Is it so?

sm501: display@...00000 {
	compatible = "smi,sm501";
<snip>
	devices = {
		has-usb-host;
		has-usb-target;
	};
};

I'll try it.

> Thanks,
> Mark.
> 
> >  Example for MPC5200:
> >  	display@1,0 {
> > diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
> > index 65cd0d2..e8c6a5e 100644
> > --- a/drivers/mfd/sm501.c
> > +++ b/drivers/mfd/sm501.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/pci.h>
> >  #include <linux/i2c-gpio.h>
> >  #include <linux/slab.h>
> > +#include <linux/of.h>
> >  
> >  #include <linux/sm501.h>
> >  #include <linux/sm501-regs.h>
> > @@ -1297,7 +1298,7 @@ static unsigned int sm501_mem_local[] = {
> >   * Common init code for an SM501
> >  */
> >  
> > -static int sm501_init_dev(struct sm501_devdata *sm)
> > +static int sm501_init_dev(struct sm501_devdata *sm, unsigned int devices)
> >  {
> >  	struct sm501_initdata *idata;
> >  	struct sm501_platdata *pdata;
> > @@ -1342,16 +1343,15 @@ static int sm501_init_dev(struct sm501_devdata *sm)
> >  	pdata = sm->platdata;
> >  	idata = pdata ? pdata->init : NULL;
> >  
> > -	if (idata) {
> > +	if (idata)
> >  		sm501_init_regs(sm, idata);
> >  
> > -		if (idata->devices & SM501_USE_USB_HOST)
> > -			sm501_register_usbhost(sm, &mem_avail);
> > -		if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
> > -			sm501_register_uart(sm, idata->devices);
> > -		if (idata->devices & SM501_USE_GPIO)
> > -			sm501_register_gpio(sm);
> > -	}
> > +	if (devices & SM501_USE_USB_HOST)
> > +		sm501_register_usbhost(sm, &mem_avail);
> > +	if (devices & (SM501_USE_UART0 | SM501_USE_UART1))
> > +		sm501_register_uart(sm, devices);
> > +	if (devices & SM501_USE_GPIO)
> > +		sm501_register_gpio(sm);
> >  
> >  	if (pdata && pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
> >  		if (!sm501_gpio_isregistered(sm))
> > @@ -1377,6 +1377,7 @@ static int sm501_plat_probe(struct platform_device *dev)
> >  {
> >  	struct sm501_devdata *sm;
> >  	int ret;
> > +	unsigned int devices = 0;
> >  
> >  	sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
> >  	if (sm == NULL) {
> > @@ -1415,6 +1416,11 @@ static int sm501_plat_probe(struct platform_device *dev)
> >  	}
> >  
> >  	platform_set_drvdata(dev, sm);
> > +	if (sm->platdata)
> > +		devices = sm->platdata->init->devices;
> > +	if (dev->dev.of_node)
> > +		of_property_read_u32(dev->dev.of_node, "smi,devices",
> > +				     &devices);
> >  
> >  	sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
> >  
> > @@ -1424,7 +1430,7 @@ static int sm501_plat_probe(struct platform_device *dev)
> >  		goto err_claim;
> >  	}
> >  
> > -	return sm501_init_dev(sm);
> > +	return sm501_init_dev(sm, devices);
> >  
> >   err_claim:
> >  	release_resource(sm->regs_claim);
> > @@ -1635,7 +1641,7 @@ static int sm501_pci_probe(struct pci_dev *dev,
> >  		goto err4;
> >  	}
> >  
> > -	sm501_init_dev(sm);
> > +	sm501_init_dev(sm, sm->platdata->init->devices);
> >  	return 0;
> >  
> >   err4:
> > -- 
> > 2.7.0
> > 
> > --
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> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>