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Date: Mon, 20 Mar 2023 18:07:45 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Changhuang Liang <changhuang.liang@...rfivetech.com>
Cc: Kishon Vijay Abraham I <kishon@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Emil Renner Berthing <kernel@...il.dk>,
Conor Dooley <conor@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Philipp Zabel <p.zabel@...gutronix.de>,
Jack Zhu <jack.zhu@...rfivetech.com>,
linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] phy: starfive: Add mipi dphy rx support
On 22-02-23, 17:59, Changhuang Liang wrote:
> Add mipi dphy rx support for the Starfive JH7110 SoC. It is used to
> transfer CSI camera data.
>
> Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
> ---
> MAINTAINERS | 7 +
> drivers/phy/Kconfig | 1 +
> drivers/phy/Makefile | 1 +
> drivers/phy/starfive/Kconfig | 13 +
> drivers/phy/starfive/Makefile | 2 +
> drivers/phy/starfive/phy-starfive-dphy-rx.c | 362 ++++++++++++++++++++
> 6 files changed, 386 insertions(+)
> create mode 100644 drivers/phy/starfive/Kconfig
> create mode 100644 drivers/phy/starfive/Makefile
> create mode 100644 drivers/phy/starfive/phy-starfive-dphy-rx.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2e70c9f21989..8ddef8669efb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19952,6 +19952,13 @@ F: Documentation/devicetree/bindings/power/starfive*
> F: drivers/soc/starfive/jh71xx_pmu.c
> F: include/dt-bindings/power/starfive,jh7110-pmu.h
>
> +STARFIVE JH7110 DPHY RX DRIVER
> +M: Jack Zhu <jack.zhu@...rfivetech.com>
> +M: Changhuang Liang <changhuang.liang@...rfivetech.com>
> +S: Supported
> +F: Documentation/devicetree/bindings/phy/starfive,jh7110-dphy-rx.yaml
> +F: drivers/phy/starfive/phy-starfive-dphy-rx.c
> +
> STATIC BRANCH/CALL
> M: Peter Zijlstra <peterz@...radead.org>
> M: Josh Poimboeuf <jpoimboe@...nel.org>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 7bd00a11d074..c4b2a86e2afb 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -91,6 +91,7 @@ source "drivers/phy/rockchip/Kconfig"
> source "drivers/phy/samsung/Kconfig"
> source "drivers/phy/socionext/Kconfig"
> source "drivers/phy/st/Kconfig"
> +source "drivers/phy/starfive/Kconfig"
> source "drivers/phy/sunplus/Kconfig"
> source "drivers/phy/tegra/Kconfig"
> source "drivers/phy/ti/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 54f312c10a40..fb3dc9de6111 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -31,6 +31,7 @@ obj-y += allwinner/ \
> samsung/ \
> socionext/ \
> st/ \
> + starfive/ \
> sunplus/ \
> tegra/ \
> ti/ \
> diff --git a/drivers/phy/starfive/Kconfig b/drivers/phy/starfive/Kconfig
> new file mode 100644
> index 000000000000..e449a662acf5
> --- /dev/null
> +++ b/drivers/phy/starfive/Kconfig
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# Phy drivers for Starfive platforms
> +#
> +
> +config PHY_STARFIVE_DPHY_RX
> + tristate "Starfive D-PHY RX Support"
> + select GENERIC_PHY
> + select GENERIC_PHY_MIPI_DPHY
> + help
> + Choose this option if you have a Starfive D-PHY in your
> + system. If M is selected, the module will be called
> + phy-starfive-dphy-rx.
> diff --git a/drivers/phy/starfive/Makefile b/drivers/phy/starfive/Makefile
> new file mode 100644
> index 000000000000..7ec576cb30ae
> --- /dev/null
> +++ b/drivers/phy/starfive/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_PHY_STARFIVE_DPHY_RX) += phy-starfive-dphy-rx.o
> diff --git a/drivers/phy/starfive/phy-starfive-dphy-rx.c b/drivers/phy/starfive/phy-starfive-dphy-rx.c
> new file mode 100644
> index 000000000000..2a7c5453f4ce
> --- /dev/null
> +++ b/drivers/phy/starfive/phy-starfive-dphy-rx.c
> @@ -0,0 +1,362 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * DPHY driver for the StarFive JH7110 SoC
> + *
> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#define STF_DPHY_APBCFGSAIF__SYSCFG(x) (x)
What is the purpose of this? also whats with __ ?
> +
> +#define STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_EN BIT(6)
> +#define STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_IN GENMASK(12, 7)
> +#define STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_EN BIT(19)
> +#define STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_IN GENMASK(25, 20)
> +
> +#define STF_DPHY_DATA_BUS16_8 BIT(8)
> +#define STF_DPHY_DEBUG_MODE_SEL GENMASK(15, 9)
> +
> +#define STF_DPHY_ENABLE_CLK BIT(6)
> +#define STF_DPHY_ENABLE_CLK1 BIT(7)
> +#define STF_DPHY_ENABLE_LAN0 BIT(8)
> +#define STF_DPHY_ENABLE_LAN1 BIT(9)
> +#define STF_DPHY_ENABLE_LAN2 BIT(10)
> +#define STF_DPHY_ENABLE_LAN3 BIT(11)
> +#define STF_DPHY_GPI_EN GENMASK(17, 12)
> +#define STF_DPHY_HS_FREQ_CHANGE_CLK BIT(18)
> +#define STF_DPHY_HS_FREQ_CHANGE_CLK1 BIT(19)
> +#define STF_DPHY_LANE_SWAP_CLK GENMASK(22, 20)
> +#define STF_DPHY_LANE_SWAP_CLK1 GENMASK(25, 23)
> +#define STF_DPHY_LANE_SWAP_LAN0 GENMASK(28, 26)
> +#define STF_DPHY_LANE_SWAP_LAN1 GENMASK(31, 29)
> +
> +#define STF_DPHY_LANE_SWAP_LAN2 GENMASK(2, 0)
> +#define STF_DPHY_LANE_SWAP_LAN3 GENMASK(5, 3)
> +#define STF_DPHY_MP_TEST_EN BIT(6)
> +#define STF_DPHY_MP_TEST_MODE_SEL GENMASK(11, 7)
> +#define STF_DPHY_PLL_CLK_SEL GENMASK(21, 12)
> +#define STF_DPHY_PRECOUNTER_IN_CLK GENMASK(29, 22)
> +
> +#define STF_DPHY_PRECOUNTER_IN_CLK1 GENMASK(7, 0)
> +#define STF_DPHY_PRECOUNTER_IN_LAN0 GENMASK(15, 8)
> +#define STF_DPHY_PRECOUNTER_IN_LAN1 GENMASK(23, 16)
> +#define STF_DPHY_PRECOUNTER_IN_LAN2 GENMASK(31, 24)
> +
> +#define STF_DPHY_PRECOUNTER_IN_LAN3 GENMASK(7, 0)
> +#define STF_DPHY_RX_1C2C_SEL BIT(8)
> +
> +struct regval_t {
regval should be okay, no?
> + u32 addr;
> + u32 val;
> +};
> +
> +struct stf_dphy {
> + struct device *dev;
> + void __iomem *regs;
> + struct clk *cfg_clk;
> + struct clk *ref_clk;
> + struct clk *tx_clk;
> + struct reset_control *rstc;
> + struct regulator *mipi_0p9;
> + struct phy *phy;
> + struct regmap *stf_aon_syscon;
> + unsigned int aon_gp_reg;
> +};
> +
> +struct stf_dphy_info {
> + bool external_support;
> + int (*external_get)(struct stf_dphy *dphy);
> + void (*external_init)(struct stf_dphy *dphy);
> + void (*external_exit)(struct stf_dphy *dphy);
> +};
> +
> +static const struct stf_dphy_info *stf_dphy_info;
> +
> +static const struct regval_t stf_dphy_init_list[] = {
> + { STF_DPHY_APBCFGSAIF__SYSCFG(4), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(8), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(12), 0x0000fff0 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(16), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(20), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(24), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(28), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(32), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(36), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(40), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(40), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(48), 0x24000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(52), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(56), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(60), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(64), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(68), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(72), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(76), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(80), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(84), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(88), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(92), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(96), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(100), 0x02000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(104), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(108), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(112), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(116), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(120), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(124), 0x0000000c },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(128), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(132), 0xcc500000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(136), 0x000000cc },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(140), 0x00000000 },
> + { STF_DPHY_APBCFGSAIF__SYSCFG(144), 0x00000000 },
> +};
> +
> +static int stf_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
> +{
> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> + int map[6] = {4, 0, 1, 2, 3, 5};
what does this mean?
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(stf_dphy_init_list); i++)
> + writel(stf_dphy_init_list[i].val,
> + dphy->regs + stf_dphy_init_list[i].addr);
> +
> + writel(FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_EN, 1) |
> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_IN, 0x1b) |
> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_EN, 1) |
> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_IN, 0x1b),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(0));
> +
> + writel(FIELD_PREP(STF_DPHY_DATA_BUS16_8, 0) |
> + FIELD_PREP(STF_DPHY_DEBUG_MODE_SEL, 0x5a),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(184));
> +
> + writel(FIELD_PREP(STF_DPHY_ENABLE_CLK, 1) |
> + FIELD_PREP(STF_DPHY_ENABLE_CLK1, 1) |
> + FIELD_PREP(STF_DPHY_ENABLE_LAN0, 1) |
> + FIELD_PREP(STF_DPHY_ENABLE_LAN1, 1) |
> + FIELD_PREP(STF_DPHY_ENABLE_LAN2, 1) |
> + FIELD_PREP(STF_DPHY_ENABLE_LAN3, 1) |
> + FIELD_PREP(STF_DPHY_GPI_EN, 0) |
> + FIELD_PREP(STF_DPHY_HS_FREQ_CHANGE_CLK, 0) |
> + FIELD_PREP(STF_DPHY_HS_FREQ_CHANGE_CLK1, 0) |
> + FIELD_PREP(STF_DPHY_LANE_SWAP_CLK, map[0]) |
> + FIELD_PREP(STF_DPHY_LANE_SWAP_CLK1, map[5]) |
> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN0, map[1]) |
> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN1, map[2]),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(188));
> +
> + writel(FIELD_PREP(STF_DPHY_LANE_SWAP_LAN2, map[3]) |
> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN3, map[4]) |
> + FIELD_PREP(STF_DPHY_MP_TEST_EN, 0) |
> + FIELD_PREP(STF_DPHY_MP_TEST_MODE_SEL, 0) |
> + FIELD_PREP(STF_DPHY_PLL_CLK_SEL, 0x37c) |
> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_CLK, 8),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(192));
> +
> + writel(FIELD_PREP(STF_DPHY_PRECOUNTER_IN_CLK1, 8) |
> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN0, 7) |
> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN1, 7) |
> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN2, 7),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(196));
> +
> + writel(FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN3, 7) |
> + FIELD_PREP(STF_DPHY_RX_1C2C_SEL, 0),
> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(200));
> +
> + return 0;
> +}
> +
> +static int stf_dphy_init(struct phy *phy)
> +{
> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> + int ret;
> +
> + ret = regulator_enable(dphy->mipi_0p9);
> + if (ret)
> + goto err_0p9;
> +
> + if (stf_dphy_info->external_support && stf_dphy_info->external_init)
> + stf_dphy_info->external_init(dphy);
> +
> + return 0;
> +
> +err_0p9:
> + return ret;
> +}
> +
> +static int stf_dphy_exit(struct phy *phy)
> +{
> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> +
> + if (stf_dphy_info->external_support && stf_dphy_info->external_exit)
> + stf_dphy_info->external_exit(dphy);
> +
> + regulator_disable(dphy->mipi_0p9);
> +
> + return 0;
> +}
> +
> +static int stf_dphy_power_on(struct phy *phy)
> +{
> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> +
> + clk_set_rate(dphy->cfg_clk, 99000000);
> + clk_set_rate(dphy->ref_clk, 49500000);
> + clk_set_rate(dphy->tx_clk, 19800000);
> + reset_control_deassert(dphy->rstc);
> +
> + return 0;
> +}
> +
> +static int stf_dphy_power_off(struct phy *phy)
> +{
> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> +
> + reset_control_assert(dphy->rstc);
> +
> + return 0;
> +}
> +
> +static const struct phy_ops stf_dphy_ops = {
> + .init = stf_dphy_init,
> + .exit = stf_dphy_exit,
> + .configure = stf_dphy_configure,
> + .power_on = stf_dphy_power_on,
> + .power_off = stf_dphy_power_off,
> +};
> +
> +static int stf_dphy_probe(struct platform_device *pdev)
> +{
> + struct phy_provider *phy_provider;
> + struct stf_dphy *dphy;
> + int ret;
> +
> + dphy = devm_kzalloc(&pdev->dev, sizeof(*dphy), GFP_KERNEL);
> + if (!dphy)
> + return -ENOMEM;
> + stf_dphy_info = of_device_get_match_data(&pdev->dev);
> + dev_set_drvdata(&pdev->dev, dphy);
> + dphy->dev = &pdev->dev;
> +
> + dphy->regs = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(dphy->regs))
> + return PTR_ERR(dphy->regs);
> +
> + dphy->cfg_clk = devm_clk_get(&pdev->dev, "cfg");
> + if (IS_ERR(dphy->cfg_clk))
> + return PTR_ERR(dphy->cfg_clk);
> +
> + dphy->ref_clk = devm_clk_get(&pdev->dev, "ref");
> + if (IS_ERR(dphy->ref_clk))
> + return PTR_ERR(dphy->ref_clk);
> +
> + dphy->tx_clk = devm_clk_get(&pdev->dev, "tx");
> + if (IS_ERR(dphy->tx_clk))
> + return PTR_ERR(dphy->tx_clk);
> +
> + dphy->rstc = devm_reset_control_array_get_exclusive(&pdev->dev);
> + if (IS_ERR(dphy->rstc))
> + return PTR_ERR(dphy->rstc);
> +
> + dphy->mipi_0p9 = devm_regulator_get(&pdev->dev, "mipi_0p9");
> + if (IS_ERR(dphy->mipi_0p9))
> + return PTR_ERR(dphy->mipi_0p9);
> +
> + if (stf_dphy_info->external_support && stf_dphy_info->external_get) {
> + ret = stf_dphy_info->external_get(dphy);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to get PHY external info\n");
> + return ret;
> + }
> + }
> +
> + dphy->phy = devm_phy_create(&pdev->dev, NULL, &stf_dphy_ops);
> + if (IS_ERR(dphy->phy)) {
> + dev_err(&pdev->dev, "Failed to create PHY\n");
> + return PTR_ERR(dphy->phy);
> + }
> +
> + phy_set_drvdata(dphy->phy, dphy);
> + phy_provider = devm_of_phy_provider_register(&pdev->dev,
> + of_phy_simple_xlate);
> +
> + return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static int stf_external_get(struct stf_dphy *dphy)
> +{
> + struct of_phandle_args args;
> + int ret;
> +
> + ret = of_parse_phandle_with_fixed_args(dphy->dev->of_node,
> + "starfive,aon-syscon",
> + 1, 0, &args);
> + if (ret < 0) {
> + dev_err(dphy->dev, "Failed to parse starfive,aon-syscon\n");
> + return -EINVAL;
> + }
> +
> + dphy->stf_aon_syscon = syscon_node_to_regmap(args.np);
> + of_node_put(args.np);
> + if (IS_ERR(dphy->stf_aon_syscon))
> + return PTR_ERR(dphy->stf_aon_syscon);
> +
> + dphy->aon_gp_reg = args.args[0];
> +
> + return 0;
> +}
> +
> +static void stf_external_init(struct stf_dphy *dphy)
> +{
> + regmap_update_bits(dphy->stf_aon_syscon, dphy->aon_gp_reg,
> + BIT(31), BIT(31));
> +}
> +
> +static void stf_external_exit(struct stf_dphy *dphy)
> +{
> + regmap_update_bits(dphy->stf_aon_syscon, dphy->aon_gp_reg,
> + BIT(31), 0);
> +}
> +
> +static const struct stf_dphy_info starfive_dphy_info = {
> + .external_support = true,
> + .external_get = stf_external_get,
> + .external_init = stf_external_init,
> + .external_exit = stf_external_exit,
> +};
> +
> +static const struct of_device_id stf_dphy_dt_ids[] = {
> + {
> + .compatible = "starfive,jh7110-dphy-rx",
> + .data = &starfive_dphy_info,
is there a plan to support multiple versions which need different
get/init/exit methods?
> + },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, stf_dphy_dt_ids);
> +
> +static struct platform_driver stf_dphy_driver = {
> + .probe = stf_dphy_probe,
> + .driver = {
> + .name = "starfive-dphy-rx",
> + .of_match_table = stf_dphy_dt_ids,
> + },
> +};
> +module_platform_driver(stf_dphy_driver);
> +
> +MODULE_AUTHOR("Jack Zhu <jack.zhu@...rfivetech.com>");
> +MODULE_AUTHOR("Changhuang Liang <changhuang.liang@...rfivetech.com>");
> +MODULE_DESCRIPTION("Starfive DPHY RX driver");
> +MODULE_LICENSE("GPL");
> --
> 2.25.1
--
~Vinod
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