Re: [PATCH v3 07/18] dmaengine: dma-jz4780: Add support for the JZ4770 SoC

[Vinod]

On 24-07-18, 17:04, Paul Cercueil wrote:
> Hi Vinod,
> 
> Le mar. 24 juil. 2018 à 15:32, Vinod <vkoul@xxxxxxxxxx> a écrit :
> > On 21-07-18, 13:06, Paul Cercueil wrote:
> > >  +static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev
> > > *jzdma,
> > >  +	unsigned int chn)
> > 
> > right justified and aligned with preceding please. While adding new
> > code to a existing driver it is a good idea to conform to existing style
> 
> OK.
> 
> > >  +{
> > >  +	if (jzdma->version == ID_JZ4770)
> > >  +		jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKES, BIT(chn));
> > >  +}
> > >  +
> > >  +static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev
> > > *jzdma,
> > >  +	unsigned int chn)
> > >  +{
> > >  +	if (jzdma->version == ID_JZ4770)
> > >  +		jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
> > 
> > so if another version has this feature we would do:
> >         if (jzdma->version == ID_JZ4770) ||
> >                 if (jzdma->version == ID_JZXXXX))
> > 
> > and so on.. why not add a value, clk_enable in the description and use
> > that. For each controller it is set to true or false
> 
> I agree with what you said in your other answers.
> However here I still need to check the "version", because on JZ4725B and
> JZ4770+
> the way to start/stop each DMA channel's clock is different, so I can't use
> a boolean

sure describe the behavior and use that. Versions is not a very scalable
way..

-- 
~Vinod