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

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Message-ID: <20181221103907.GK13248@dell>
Date:   Fri, 21 Dec 2018 10:39:07 +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, 21 Dec 2018, Marek Szyprowski wrote:

> Hi
> 
> On 2018-12-21 11:13, Lee Jones wrote:
> > 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.
> 
> It only enables routing interrupts out of LPASS HW module. This is
> completely transparent for the rest of the system (UART and CPU/GIC).
> UART driver will get them via standard ARM/GIC interrupt controller and
> UART driver will enable/mask/handle it by itself via standard methods.

Sounds fine.  But that is not what the commit message says.

> >> 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)
> 
> Best regards

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