[RFCv2 endianess 1/4] pwm: Add Freescale FTM PWM driver support

[Li.Xiubo at freescale.com]

> > > +static inline u32 fsl_pwm_readl(struct fsl_pwm_chip *fpc,
> > > +             const void __iomem *addr)
> > > +{
> > > +     if (likely(fpc->big_endian))
> > > +             return ioread32be(addr);
> > > +     else
> > > +             return readl(addr);
> > > +}
> 
> It looks a little odd to to have two different accessors here.
> 
> Could these not be unified somehow?
> 

How about the following :

+static inline u32 fsl_pwm_readl(struct fsl_pwm_chip *fpc,
+			const void __iomem *addr)
+{
+	u32 val;
+
+	if (likely(fpc->big_endian))
+		val = be32_to_cpu(__raw_readl(addr));
+	else
+		val = le32_to_cpu(__raw_readl(addr));
+
+	rmb();
+
+	return val;
+}
+
+static inline void fsl_pwm_writel(struct fsl_pwm_chip *fpc,
+			u32 val, void __iomem *addr)
+{
+	wmb();
+
+	if (likely(fpc->big_endian))
+		__raw_writel(cpu_to_be32(val), addr);
+	else
+		__raw_writel(cpu_to_le32(val), addr);
+}
+


> > > +static inline void fsl_pwm_writel(struct fsl_pwm_chip *fpc,
> > > +             u32 val, void __iomem *addr)
> > > +{
> > > +     if (likely(fpc->big_endian))
> > > +             iowrite32be(val, addr);
> > > +     else
> > > +             writel(val, addr);
> > > +}
> 
> Likewise.
> 
> [...]
> 
> > > +static int fsl_pwm_probe(struct platform_device *pdev) {
> > > +     int ret;
> > > +     struct fsl_pwm_chip *fpc;
> > > +     struct resource *res;
> > > +     struct device_node *np = pdev->dev.of_node;
> > > +
> > > +     fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL);
> > > +     if (!fpc)
> > > +             return -ENOMEM;
> > > +
> > > +     mutex_init(&fpc->lock);
> > > +
> > > +     fpc->chip.dev = &pdev->dev;
> > > +
> > > +     if (of_get_property(np, "big-endian", NULL))
> > > +             fpc->big_endian = 1;
> 
> You can use of_property_read_bool:
> 
> fpc->big_endian = of_property_read_bool(np, "big-endian");
> 
> Otherwise, the DT stuff looks fine.
> 

That sounds good.


--
Xiubo,