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

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Date:	Tue, 28 Jun 2016 23:32:20 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sm501: Add device property

On Tue, 28 Jun 2016 16:49:08 +0900,
Lee Jones wrote:
> 
> On Tue, 28 Jun 2016, Yoshinori Sato wrote:
> 
> > This driver have configuration parameter "device" in platform_data.
> > But don't have it in devicetree.
> > 
> > This patch add "device" configuration to devicetree.
> 
> This is really ugly.

I don't know details, either, so it may be wrong.

> 1. Where are you documenting the binding?
It looks remove of commit 4295f9bf74a885da390abc49a3b42a011c1bb890.
Revert.

> 2. Just because it's in platform data, it doesn't mean it lives in DT
SM501's devicetree support only framebuffer module.
This property not needed only framebuffer.

> 3. Does this code even work?
>    Won't private_platdata get freed when you leave probe()?
Yes. This code works RTS7751R2D (SH4).

> 4. Where is 'devices' consumed?
It used "sm501_init_dev".

I'll sent v2/
Thanks.

> > Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > ---
> >  drivers/mfd/sm501.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > 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;
> > +	}
> >  
> >  	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>