linux-kernel - Re: [PATCH v2] clk: qcom: Add camera clock controller driver for SDM845

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Message-ID: <153322925025.10763.7919558124009549240@swboyd.mtv.corp.google.com>
Date:   Thu, 02 Aug 2018 10:00:50 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Amit Nischal <anischal@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Odelu Kukatla <okukatla@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Nischal <anischal@...eaurora.org>
Subject: Re: [PATCH v2] clk: qcom: Add camera clock controller driver for SDM845

Quoting Amit Nischal (2018-07-30 02:22:20)
> diff --git a/drivers/clk/qcom/camcc-sdm845.c b/drivers/clk/qcom/camcc-sdm845.c
> new file mode 100644
> index 0000000..702ca66
> --- /dev/null
> +++ b/drivers/clk/qcom/camcc-sdm845.c
> @@ -0,0 +1,1744 @@
> +       },
> +};
> +
> +static const struct freq_tbl ftbl_cam_cc_bps_clk_src[] = {
> +       F(19200000, P_BI_TCXO, 1, 0, 0),
> +       F(100000000, P_CAM_CC_PLL0_OUT_EVEN, 6, 0, 0),
> +       F(200000000, P_CAM_CC_PLL0_OUT_EVEN, 3, 0, 0),
> +       F(404000000, P_CAM_CC_PLL1_OUT_EVEN, 2, 0, 0),
> +       F(480000000, P_CAM_CC_PLL2_OUT_EVEN, 1, 0, 0),
> +       F(600000000, P_CAM_CC_PLL0_OUT_EVEN, 1, 0, 0),
> +       { }
> +};
> +
> +/*
> + * As per HW design, some of the CAMCC RCGs needs to
> + * move to XO clock during their clock disable so using

Per hw design sure, but what about hw design is causing this?

> + * clk_rcg2_shared_ops for such RCGs.
> + * Also, use CLK_SET_RATE_PARENT flag for the RCGs which
> + * have non-fixed PLL as parent source and requires

Mention the PLL that isn't fixed?

> + * reconfiguration of the PLL frequency.
> + */
> +static struct clk_rcg2 cam_cc_bps_clk_src = {
> +       .cmd_rcgr = 0x600c,
> +       .mnd_width = 0,