linux-kernel - Re: [PATCH v4 2/7] clk: mediatek: Fix rate and dependency of MT8173 clocks

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Date:	Fri, 24 Jul 2015 19:10:14 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	James Liao <jamesjj.liao@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Heiko Stubner <heiko@...ech.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Ricky Liang <jcliang@...omium.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 2/7] clk: mediatek: Fix rate and dependency of MT8173 clocks

On Fri, Jul 24, 2015 at 11:02 AM, James Liao <jamesjj.liao@...iatek.com> wrote:
> Remove the dependency from clk_null, and give all root clocks a
> typical rate, include clkph_mck_o, usb_syspll_125m and hdmitx_dig_cts.
>
> dpi_ck was removed due to no clock reference to it.
>
> Replace parent clock of infra_cpum with cpum_ck, which is an external
> clock and can be defined in the deivce tree.
>
> Signed-off-by: James Liao <jamesjj.liao@...iatek.com>
> ---
>  drivers/clk/mediatek/clk-mt8173.c      | 13 ++++++-------
>  include/dt-bindings/clock/mt8173-clk.h |  1 -
>  2 files changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mt8173.c b/drivers/clk/mediatek/clk-mt8173.c
> index 4b9e04c..50b3266 100644
> --- a/drivers/clk/mediatek/clk-mt8173.c
> +++ b/drivers/clk/mediatek/clk-mt8173.c
> @@ -24,11 +24,9 @@
>
>  static DEFINE_SPINLOCK(mt8173_clk_lock);
>
> -static const struct mtk_fixed_factor root_clk_alias[] __initconst = {
> -       FACTOR(CLK_TOP_CLKPH_MCK_O, "clkph_mck_o", "clk_null", 1, 1),
> -       FACTOR(CLK_TOP_DPI, "dpi_ck", "clk_null", 1, 1),
> -       FACTOR(CLK_TOP_USB_SYSPLL_125M, "usb_syspll_125m", "clk_null", 1, 1),
> -       FACTOR(CLK_TOP_HDMITX_DIG_CTS, "hdmitx_dig_cts", "clk_null", 1, 1),
> +static const struct mtk_fixed_clk fixed_clks[] __initconst = {
> +       FIXED_CLK(CLK_TOP_CLKPH_MCK_O, "clkph_mck_o", "clk26m", 400 * MHZ),
> +       FIXED_CLK(CLK_TOP_USB_SYSPLL_125M, "usb_syspll_125m", "clk26m", 125 * MHZ),
>  };
>
>  static const struct mtk_fixed_factor top_divs[] __initconst = {
> @@ -53,6 +51,7 @@ static const struct mtk_fixed_factor top_divs[] __initconst = {
>         FACTOR(CLK_TOP_CLKRTC_INT, "clkrtc_int", "clk26m", 1, 793),
>         FACTOR(CLK_TOP_FPC, "fpc_ck", "clk26m", 1, 1),
>
> +       FACTOR(CLK_TOP_HDMITX_DIG_CTS, "hdmitx_dig_cts", "tvdpll_445p5m", 1, 3),
>         FACTOR(CLK_TOP_HDMITXPLL_D2, "hdmitxpll_d2", "hdmitx_dig_cts", 1, 2),
>         FACTOR(CLK_TOP_HDMITXPLL_D3, "hdmitxpll_d3", "hdmitx_dig_cts", 1, 3),
>
> @@ -611,7 +610,7 @@ static const struct mtk_gate infra_clks[] __initconst = {
>         GATE_ICG(CLK_INFRA_GCE, "infra_gce", "axi_sel", 6),
>         GATE_ICG(CLK_INFRA_L2C_SRAM, "infra_l2c_sram", "axi_sel", 7),
>         GATE_ICG(CLK_INFRA_M4U, "infra_m4u", "mem_sel", 8),
> -       GATE_ICG(CLK_INFRA_CPUM, "infra_cpum", "clk_null", 15),
> +       GATE_ICG(CLK_INFRA_CPUM, "infra_cpum", "cpum_ck", 15),
>         GATE_ICG(CLK_INFRA_KP, "infra_kp", "axi_sel", 16),
>         GATE_ICG(CLK_INFRA_CEC, "infra_cec", "clk26m", 18),
>         GATE_ICG(CLK_INFRA_PMICSPI, "infra_pmicspi", "pmicspi_sel", 22),
> @@ -714,7 +713,7 @@ static void __init mtk_topckgen_init(struct device_node *node)
>
>         clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK);
>
> -       mtk_clk_register_factors(root_clk_alias, ARRAY_SIZE(root_clk_alias), clk_data);
> +       mtk_clk_register_fixed_clks(fixed_clks, ARRAY_SIZE(fixed_clks), clk_data);
>         mtk_clk_register_factors(top_divs, ARRAY_SIZE(top_divs), clk_data);
>         mtk_clk_register_composites(top_muxes, ARRAY_SIZE(top_muxes), base,
>                         &mt8173_clk_lock, clk_data);
> diff --git a/include/dt-bindings/clock/mt8173-clk.h b/include/dt-bindings/clock/mt8173-clk.h
> index 4ad76ed..7230c38 100644
> --- a/include/dt-bindings/clock/mt8173-clk.h
> +++ b/include/dt-bindings/clock/mt8173-clk.h
> @@ -18,7 +18,6 @@
>  /* TOPCKGEN */
>
>  #define CLK_TOP_CLKPH_MCK_O            1
> -#define CLK_TOP_DPI                    2
>  #define CLK_TOP_USB_SYSPLL_125M                3

I think we should renumber the rest of the CLK_TOP_*

>  #define CLK_TOP_HDMITX_DIG_CTS         4
>  #define CLK_TOP_ARMCA7PLL_754M         5
> --
> 1.8.1.1.dirty
>
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