linux-kernel - Re: [PATCH] clk: meson: gxbb: fix wrong clock for SARADC/SANA

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Date:   Mon, 6 Nov 2017 23:03:20 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Yixun Lan <yixun.lan@...ogic.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        Xingyu Chen <xingyu.chen@...ogic.com>
Subject: Re: [PATCH] clk: meson: gxbb: fix wrong clock for SARADC/SANA

Hi Yixun,

On Mon, Nov 6, 2017 at 10:31 AM, Yixun Lan <yixun.lan@...ogic.com> wrote:
> Hi Neil:
>
>
> On 11/06/17 16:57, Neil Armstrong wrote:
>> On 06/11/2017 08:52, Yixun Lan wrote:
>>> According to the datasheet, in Meson-GXBB/GXL series,
>>> The clock gate bit for SARADC is HHI_GCLK_MPEG2 bit[22],
>>> while clock gate bit for SANA is HHI_GCLK_MPEG0 bit[10].
>>>
>>> Test passed at gxl_skt dev board.
>>>
>>> Tested-by: Xingyu Chen <xingyu.chen@...ogic.com>
>>> Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
>>>
>>> ---
>>> I think this error was introduced by a copy & paste from meson8 code?
>>> and we didn't notice them due to the SANA clock is also enabled by
>>> DTS (so SAR_ADC works fine)?
>>> ---
>>>  drivers/clk/meson/gxbb.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
>>> index b2d1e8ed7152..92168348ffa6 100644
>>> --- a/drivers/clk/meson/gxbb.c
>>> +++ b/drivers/clk/meson/gxbb.c
>>> @@ -1139,7 +1139,7 @@ static MESON_GATE(gxbb_pl301, HHI_GCLK_MPEG0, 6);
>>>  static MESON_GATE(gxbb_periphs, HHI_GCLK_MPEG0, 7);
>>>  static MESON_GATE(gxbb_spicc, HHI_GCLK_MPEG0, 8);
>>>  static MESON_GATE(gxbb_i2c, HHI_GCLK_MPEG0, 9);
>>> -static MESON_GATE(gxbb_sar_adc, HHI_GCLK_MPEG0, 10);
>>> +static MESON_GATE(gxbb_sana, HHI_GCLK_MPEG0, 10);
>>>  static MESON_GATE(gxbb_smart_card, HHI_GCLK_MPEG0, 11);
>>>  static MESON_GATE(gxbb_rng0, HHI_GCLK_MPEG0, 12);
>>>  static MESON_GATE(gxbb_uart0, HHI_GCLK_MPEG0, 13);
>>> @@ -1190,7 +1190,7 @@ static MESON_GATE(gxbb_usb0_ddr_bridge, HHI_GCLK_MPEG2, 9);
>>>  static MESON_GATE(gxbb_mmc_pclk, HHI_GCLK_MPEG2, 11);
>>>  static MESON_GATE(gxbb_dvin, HHI_GCLK_MPEG2, 12);
>>>  static MESON_GATE(gxbb_uart2, HHI_GCLK_MPEG2, 15);
>>> -static MESON_GATE(gxbb_sana, HHI_GCLK_MPEG2, 22);
>>> +static MESON_GATE(gxbb_sar_adc, HHI_GCLK_MPEG2, 22);
>>>  static MESON_GATE(gxbb_vpu_intr, HHI_GCLK_MPEG2, 25);
>>>  static MESON_GATE(gxbb_sec_ahb_ahb3_bridge, HHI_GCLK_MPEG2, 26);
>>>  static MESON_GATE(gxbb_clk81_a53, HHI_GCLK_MPEG2, 29);
>>>
>>
>> Hi Yixun,
>>
>> Can you precise how it affects the saradc driver ? from the DT and clk PoV ?
>>
> the saradc module doesn't require sana clock (it's irrelvevant), we will
> send a patchset v3 to address this.
is the SANA clock irrelevant for the SAR ADC on all SoCs (even
Meson8/Meson8b/Meson8m2) or just on the GX SoCs?
also, do you know what "SANA" stands for?


Regards
Martin