linux-kernel - Re: [PATCH v2 4/6] phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433 PCIe PHY

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Date:   Mon, 26 Oct 2020 13:50:12 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v2 4/6] phy: samsung: phy-exynos-pcie: rework driver to
 support Exynos5433 PCIe PHY

On Fri, Oct 23, 2020 at 2:58 AM Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
>
> From: Jaehoon Chung <jh80.chung@...sung.com>
>
> Exynos5440 SoC support has been dropped since commit 8c83315da1cf ("ARM:
> dts: exynos: Remove Exynos5440"). Rework this driver to support PCIe PHY
> variant found in the Exynos5433 SoCs.
>
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> [mszyprow: reworked the driver to support only Exynos5433 variant, rebased
>            onto current kernel code, rewrote commit message]
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  drivers/phy/samsung/phy-exynos-pcie.c | 304 ++++++++++----------------
>  1 file changed, 112 insertions(+), 192 deletions(-)
>
> diff --git a/drivers/phy/samsung/phy-exynos-pcie.c b/drivers/phy/samsung/phy-exynos-pcie.c
> index 7e28b1aea0d1..d91de323dd0e 100644
> --- a/drivers/phy/samsung/phy-exynos-pcie.c
> +++ b/drivers/phy/samsung/phy-exynos-pcie.c
> @@ -4,70 +4,41 @@
>   *
>   * Phy provider for PCIe controller on Exynos SoC series
>   *
> - * Copyright (C) 2017 Samsung Electronics Co., Ltd.
> + * Copyright (C) 2017-2020 Samsung Electronics Co., Ltd.
>   * Jaehoon Chung <jh80.chung@...sung.com>
>   */
>
> -#include <linux/delay.h>
>  #include <linux/io.h>
> -#include <linux/iopoll.h>
> -#include <linux/init.h>
>  #include <linux/mfd/syscon.h>
> -#include <linux/of.h>
> -#include <linux/of_address.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/phy/phy.h>
>  #include <linux/regmap.h>
>
> -/* PCIe Purple registers */
> -#define PCIE_PHY_GLOBAL_RESET          0x000
> -#define PCIE_PHY_COMMON_RESET          0x004
> -#define PCIE_PHY_CMN_REG               0x008
> -#define PCIE_PHY_MAC_RESET             0x00c
> -#define PCIE_PHY_PLL_LOCKED            0x010
> -#define PCIE_PHY_TRSVREG_RESET         0x020
> -#define PCIE_PHY_TRSV_RESET            0x024
> -
> -/* PCIe PHY registers */
> -#define PCIE_PHY_IMPEDANCE             0x004
> -#define PCIE_PHY_PLL_DIV_0             0x008
> -#define PCIE_PHY_PLL_BIAS              0x00c
> -#define PCIE_PHY_DCC_FEEDBACK          0x014
> -#define PCIE_PHY_PLL_DIV_1             0x05c
> -#define PCIE_PHY_COMMON_POWER          0x064
> -#define PCIE_PHY_COMMON_PD_CMN         BIT(3)
> -#define PCIE_PHY_TRSV0_EMP_LVL         0x084
> -#define PCIE_PHY_TRSV0_DRV_LVL         0x088
> -#define PCIE_PHY_TRSV0_RXCDR           0x0ac
> -#define PCIE_PHY_TRSV0_POWER           0x0c4
> -#define PCIE_PHY_TRSV0_PD_TSV          BIT(7)
> -#define PCIE_PHY_TRSV0_LVCC            0x0dc
> -#define PCIE_PHY_TRSV1_EMP_LVL         0x144
> -#define PCIE_PHY_TRSV1_RXCDR           0x16c
> -#define PCIE_PHY_TRSV1_POWER           0x184
> -#define PCIE_PHY_TRSV1_PD_TSV          BIT(7)
> -#define PCIE_PHY_TRSV1_LVCC            0x19c
> -#define PCIE_PHY_TRSV2_EMP_LVL         0x204
> -#define PCIE_PHY_TRSV2_RXCDR           0x22c
> -#define PCIE_PHY_TRSV2_POWER           0x244
> -#define PCIE_PHY_TRSV2_PD_TSV          BIT(7)
> -#define PCIE_PHY_TRSV2_LVCC            0x25c
> -#define PCIE_PHY_TRSV3_EMP_LVL         0x2c4
> -#define PCIE_PHY_TRSV3_RXCDR           0x2ec
> -#define PCIE_PHY_TRSV3_POWER           0x304
> -#define PCIE_PHY_TRSV3_PD_TSV          BIT(7)
> -#define PCIE_PHY_TRSV3_LVCC            0x31c
> -
> -struct exynos_pcie_phy_data {
> -       const struct phy_ops    *ops;
> -};
> +#define PCIE_PHY_OFFSET(x)             ((x) * 0x4)
> +
> +/* Sysreg FSYS register offsets and bits for Exynos5433 */
> +#define PCIE_EXYNOS5433_PHY_MAC_RESET          0x0208
> +#define PCIE_MAC_RESET_MASK                    0xFF
> +#define PCIE_MAC_RESET                         BIT(4)
> +#define PCIE_EXYNOS5433_PHY_L1SUB_CM_CON       0x1010
> +#define PCIE_REFCLK_GATING_EN                  BIT(0)
> +#define PCIE_EXYNOS5433_PHY_COMMON_RESET       0x1020
> +#define PCIE_PHY_RESET                         BIT(0)
> +#define PCIE_EXYNOS5433_PHY_GLOBAL_RESET       0x1040
> +#define PCIE_GLOBAL_RESET                      BIT(0)

Resets, why is this block not a reset provider?

> +#define PCIE_REFCLK                            BIT(1)
> +#define PCIE_REFCLK_MASK                       0x16
> +#define PCIE_APP_REQ_EXIT_L1_MODE              BIT(5)