linux-kernel - Re: [PATCH 1/4] mfd: exynos-lpass: Enable UART module support

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Date:   Fri, 21 Dec 2018 10:13:06 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Beomho Seo <beomho.seo@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/4] mfd: exynos-lpass: Enable UART module support

On Fri, 14 Dec 2018, Marek Szyprowski wrote:

> From: Beomho Seo <beomho.seo@...sung.com>
> 
> This patch enables support for UART module in Exynos Audio SubSystem.
> There are boards (for example TM2), which use it for communication with
> bluetooth chip.

Does it though?  Or does it enable the interrupt and reset something?
These calls would probably benefit from some documentation by way of
comments.

> Signed-off-by: Beomho Seo <beomho.seo@...sung.com>
> [mszyprow: rephrased commit message, added UART reset]
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> ---
>  drivers/mfd/exynos-lpass.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
> index ca829f85672f..2713de989f05 100644
> --- a/drivers/mfd/exynos-lpass.c
> +++ b/drivers/mfd/exynos-lpass.c
> @@ -82,11 +82,13 @@ static void exynos_lpass_enable(struct exynos_lpass *lpass)
>  		     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S);
>  
>  	regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK,
> -		     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S);
> +		     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S |
> +		     LPASS_INTR_UART);
>  
>  	exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET);
>  	exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET);
>  	exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET);
> +	exynos_lpass_core_sw_reset(lpass, LPASS_UART_SW_RESET);
>  }
>  
>  static void exynos_lpass_disable(struct exynos_lpass *lpass)

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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