linux-kernel - Re: [PATCH RESEND v2] mfd: sm501: Add device property

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Date:	Fri, 01 Jul 2016 00:56:59 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2] mfd: sm501: Add device property

On Thu, 30 Jun 2016 16:48:00 +0900,
Lee Jones wrote:
> 
> On Thu, 30 Jun 2016, Yoshinori Sato wrote:
> 
> > Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > ---
> >  Documentation/devicetree/bindings/mfd/sm501.txt | 45 +++++++++++++++++++++++++
> >  drivers/mfd/sm501.c                             |  9 +++++
> >  2 files changed, 54 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/sm501.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/sm501.txt b/Documentation/devicetree/bindings/mfd/sm501.txt
> > new file mode 100644
> > index 0000000..9290094
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/sm501.txt
> > @@ -0,0 +1,45 @@
> > +* SM SM501
> > +
> > +The SM SM501 is a LCD controller, with proper hardware, it can also
> > +drive DVI monitors.
> > +
> > +Required properties:
> > +- compatible : should be "smi,sm501".
> > +- reg : contain two entries:
> > +    - First entry: System Configuration register
> > +    - Second entry: IO space (Display Controller register)
> > +- interrupts : SMI interrupt to the cpu should be described here.
> > +- interrupt-parent : the phandle for the interrupt controller that
> > +  services interrupts for this device.
> > +
> > +Optional properties:
> > +- mode : select a video mode:
> > +    <xres>x<yres>[-<bpp>][@<refresh>]
> > +- edid : verbatim EDID data block describing attached display.
> > +  Data from the detailed timing descriptor will be used to
> > +  program the display controller.
> > +- little-endian: available on big endian systems, to
> > +  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
> > +
> > +Example for MPC5200:
> > +	display@1,0 {
> > +		compatible = "smi,sm501";
> > +		reg = <1 0x00000000 0x00800000
> > +		       1 0x03e00000 0x00200000>;
> > +		interrupts = <1 1 3>;
> > +		mode = "640x480-32@60";
> > +		edid = [edid-data];
> > +	};
> > diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
> > index 65cd0d2..e2e3f9b 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>
> > @@ -1377,6 +1378,8 @@ static int sm501_plat_probe(struct platform_device *dev)
> >  {
> >  	struct sm501_devdata *sm;
> >  	int ret;
> > +	struct sm501_platdata private_platdata;
> > +	struct sm501_initdata private_initdata;
> >  
> >  	sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
> >  	if (sm == NULL) {
> > @@ -1388,6 +1391,12 @@ static int sm501_plat_probe(struct platform_device *dev)
> >  	sm->dev = &dev->dev;
> >  	sm->pdev_id = dev->id;
> >  	sm->platdata = dev_get_platdata(&dev->dev);
> > +	if (!sm->platdata) {
> > +		of_property_read_u32(dev->dev.of_node, "smi,devices",
> > +				     (u32 *)&private_initdata.devices);
> > +		private_platdata.init = &private_initdata;
> > +		sm->platdata = &private_platdata;
> > +	}
> 
> I've asked about this 3 times now.
> 
> What consumes this platform data?
> 
> It also looks ugly and fragile.

It's appropriate to use dev.of_node, isn't it?
If it's misunderstood, I'm sorry.

> >  	ret = platform_get_irq(dev, 0);
> >  	if (ret < 0) {
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

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