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

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Date:   Mon, 6 Nov 2017 17:31:56 +0800
From:   Yixun Lan <yixun.lan@...ogic.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
CC:     <yixun.lan@...ogic.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Xingyu Chen <xingyu.chen@...ogic.com>,
        <linux-amlogic@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: meson: gxbb: fix wrong clock for SARADC/SANA

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.

> Also, can you add a Fixes: tag on the patch ?
> 
sure, I can do this.

> Thanks,
> Neil
> 
> .
>