linux-kernel - Re: [PATCH 4/5] ASoC: rockchip-i2s: fix registers' property of rockchip i2s controller

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Message-ID: <5414AFA6.9060904@cogentembedded.com>
Date:	Sat, 13 Sep 2014 23:57:10 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jianqun <jay.xu@...k-chips.com>, heiko@...ech.de,
	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.de, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
CC:	huangtao@...k-chips.com, cf@...k-chips.com
Subject: Re: [PATCH 4/5] ASoC: rockchip-i2s: fix registers' property of rockchip
 i2s controller

Hello.

On 9/13/2014 3:42 AM, Jianqun wrote:

> Reference rockchip I2S controller TRM, modify some registers' property
> I2S_FIFOLR: read / write, but not volatile, not precious
> I2S_INTSR: read / write
> I2S_CLR: volatile, register value will be cleared by read

> Test on RK3288 with max98090.

> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
> ---
>   sound/soc/rockchip/rockchip_i2s.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)

> diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
> index 1b9b404..6595383 100644
> --- a/sound/soc/rockchip/rockchip_i2s.c
> +++ b/sound/soc/rockchip/rockchip_i2s.c
[...]
> @@ -385,8 +387,6 @@ static bool rockchip_i2s_volatile_reg(struct device *dev, unsigned int reg)
>   static bool rockchip_i2s_precious_reg(struct device *dev, unsigned int reg)
>   {
>   	switch (reg) {
> -	case I2S_FIFOLR:
> -		return true;
>   	default:
>   		return false;
>   	}

    Shouldn't this be folded into simple *return* false now?

WBR, Sergei


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