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Message-ID: <20170620014137.GK4493@codeaurora.org>
Date: Mon, 19 Jun 2017 18:41:37 -0700
From: Stephen Boyd <sboyd@...eaurora.org>
To: Chunyan Zhang <chunyan.zhang@...eadtrum.com>
Cc: Michael Turquette <mturquette@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
Xiaolong Zhang <xiaolong.zhang@...eadtrum.com>,
Orson Zhai <orson.zhai@...eadtrum.com>,
Geng Ren <geng.ren@...eadtrum.com>,
Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V1 8/9] clk: sprd: add clocks support for SC9860
On 06/18, Chunyan Zhang wrote:
> diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
> index c593a93..0d90b40 100644
> --- a/drivers/clk/sprd/Makefile
> +++ b/drivers/clk/sprd/Makefile
> @@ -1,3 +1,4 @@
> ifneq ($(CONFIG_OF),)
> obj-y += ccu_common.o ccu_gate.o ccu_mux.o ccu_div.o ccu_composite.o ccu_pll.o
> +obj-y += ccu-sc9860.o
And a Kconfig for this SoC specific driver.
> endif
> diff --git a/drivers/clk/sprd/ccu-sc9860.c b/drivers/clk/sprd/ccu-sc9860.c
> new file mode 100644
> index 0000000..6cd4dc5
> --- /dev/null
> +++ b/drivers/clk/sprd/ccu-sc9860.c
> +
> +static CLK_FIXED_FACTOR(fac_4m, "fac-4m", "ext-26m",
> + 6, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_2m, "fac-2m", "ext-26m",
> + 13, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_1m, "fac-1m", "ext-26m",
> + 26, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_250k, "fac-250k", "ext-26m",
> + 104, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_rpll0_26m, "rpll0-26m", "ext-26m",
> + 1, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_rpll1_26m, "rpll1-26m", "ext-26m",
> + 1, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_rco_25m, "rco-25m", "ext-rc0-100m",
> + 4, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_rco_4m, "rco-4m", "ext-rc0-100m",
> + 25, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_rco_2m, "rco-2m", "ext-rc0-100m",
> + 50, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_3k2, "fac-3k2", "ext-32k",
> + 10, 1, CLK_IS_BASIC);
> +static CLK_FIXED_FACTOR(fac_1k, "fac-1k", "ext-32k",
> + 32, 1, CLK_IS_BASIC);
> +
> +#define SC9860_GATE_FLAGS (CLK_IGNORE_UNUSED | CLK_IS_BASIC)
No CLK_IS_BASIC. Why is everything marked as CLK_IGNORE_UNUSED?
> +static SPRD_CCU_GATE(rpll0_gate, "rpll0-gate", "ext-26m", 0x402b016c,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(rpll1_gate, "rpll1-gate", "ext-26m", 0x402b016c,
> + 0x1000, BIT(18), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(mpll0_gate, "mpll0-gate", "ext-26m", 0x402b00b0,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(mpll1_gate, "mpll1-gate", "ext-26m", 0x402b00b0,
> + 0x1000, BIT(18), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(dpll0_gate, "dpll0-gate", "ext-26m", 0x402b00b4,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(dpll1_gate, "dpll1-gate", "ext-26m", 0x402b00b4,
> + 0x1000, BIT(18), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(gpll_gate, "gpll-gate", "ext-26m", 0x402b032c,
> + 0x1000, BIT(0), SC9860_GATE_FLAGS,
> + CLK_GATE_SET_TO_DISABLE);
> +static SPRD_CCU_GATE(cppll_gate, "cppll-gate", "ext-26m", 0x402b02b4,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(ltepll0_gate, "ltepll0-gate", "ext-26m", 0x402b00b8,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(ltepll1_gate, "ltepll1-gate", "ext-26m", 0x402b010c,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE(twpll_gate, "twpll-gate", "ext-26m", 0x402b00bc,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio0_2x_en, "sdio0-2x-en", 0x402e013c,
> + 0x1000, BIT(2), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio0_1x_en, "sdio0-1x-en", 0x402e013c,
> + 0x1000, BIT(3), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio1_2x_en, "sdio1-2x-en", 0x402e013c,
> + 0x1000, BIT(4), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio1_1x_en, "sdio1-1x-en", 0x402e013c,
> + 0x1000, BIT(5), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio2_2x_en, "sdio2-2x-en", 0x402e013c,
> + 0x1000, BIT(6), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(sdio2_1x_en, "sdio2-1x-en", 0x402e013c,
> + 0x1000, BIT(7), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(emmc_1x_en, "emmc-1x-en", 0x402e013c,
> + 0x1000, BIT(8), SC9860_GATE_FLAGS, 0);
> +static SPRD_CCU_GATE_NO_PARENT(emmc_2x_en, "emmc-2x-en", 0x402e013c,
> + 0x1000, BIT(9), SC9860_GATE_FLAGS, 0);
> +
> +/* GPLL/LPLL/DPLL/RPLL/CPLL */
> +static const u64 const itable1[4] = {3, 780000000, 988000000, 1196000000};
> +
> +/* TWPLL/MPLL0/MPLL1 */
> +static const u64 itable2[4] = {3, 1638000000, 2080000000, 2600000000UL};
> +
> +static const struct ccu_bit_field const f_rpll[PLL_FACT_MAX] = {
> + { .shift = 0, .width = 1 }, /* lock_done */
> + { .shift = 3, .width = 1 }, /* div_s */
> + { .shift = 80, .width = 1 }, /* mod_en */
Are they even shifts? Or offsets from some base? I have to go
back and read the other patch.
> + { .shift = 81, .width = 1 }, /* sdm_en */
> + { .shift = 0, .width = 0 }, /* refin */
> + { .shift = 14, .width = 2 }, /* ibias */
> + { .shift = 16, .width = 7 }, /* n */
> + { .shift = 4, .width = 7 }, /* nint */
> + { .shift = 32, .width = 23}, /* kint */
> + { .shift = 0, .width = 0 }, /* prediv */
> + { .shift = 0, .width = 0 }, /* postdiv */
> +};
> +static const u32 const regs_rpll0[4] = { 3, 0x44, 0x48, 0x4c };
> +static SPRD_CCU_PLL_WITH_ITABLE(rpll0_clk, "rpll0", "rpll0-gate", 0x40400044,
> + regs_rpll0, itable1, 200, f_rpll);
> +
> +static const u32 const regs_rpll1[4] = { 3, 0x50, 0x54, 0x58 };
> +static SPRD_CCU_PLL_WITH_ITABLE(rpll1_clk, "rpll1", "rpll1-gate", 0x40400050,
> + regs_rpll1, itable1, 200, f_rpll);
> +
> +static const struct ccu_bit_field const f_mpll0[PLL_FACT_MAX] = {
[...]
> diff --git a/include/dt-bindings/clock/sc9860-ccu.h b/include/dt-bindings/clock/sc9860-ccu.h
> new file mode 100644
> index 0000000..dd7ccf9
> --- /dev/null
> +++ b/include/dt-bindings/clock/sc9860-ccu.h
> @@ -0,0 +1,19 @@
> +/*
> + * Spreadtrum SC9860 platform clocks
> + *
> + * Copyright (C) 2017, Spreadtrum Communications Inc.
> + *
> + * SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> + */
> +
> +#ifndef _DT_BINDINGS_CLK_SC9860_CCU_H_
> +#define _DT_BINDINGS_CLK_SC9860_CCU_H_
> +
> +#define CLK_FAC_1M 2
> +#define CLK_EMMC_2X_EN 29
> +#define CLK_L0_409M6 60
> +#define CLK_EMMC_2X 88
> +#define CLK_EMMC_EB 158
Why are only a handful exposed in the header file? Not exposing
everything is mostly a maintenance nightmare right now.
--
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