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

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Date:   Mon, 6 Nov 2017 09:57:26 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Yixun Lan <yixun.lan@...ogic.com>,
        Jerome Brunet <jbrunet@...libre.com>
Cc:     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

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 ?

Also, can you add a Fixes: tag on the patch ?

Thanks,
Neil