linux-kernel - Re: [PATCH V2 4/7] phy: qcom-qmp: Add compatible for ipq8074 PCIe Gen3 qmp phy

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Date:   Sun, 23 Aug 2020 21:14:15 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Sivaprakash Murugesan <sivaprak@...eaurora.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, bhelgaas@...gle.com,
        robh+dt@...nel.org, kishon@...com, svarbanov@...sol.com,
        lorenzo.pieralisi@....com, p.zabel@...gutronix.de,
        mgautam@...eaurora.org, smuthayy@...eaurora.org,
        varada@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Selvam Sathappan Periakaruppan <speriaka@...eaurora.org>
Subject: Re: [PATCH V2 4/7] phy: qcom-qmp: Add compatible for ipq8074 PCIe
 Gen3 qmp phy

Hi Sivaprakash,

On 29-07-20, 21:00, Sivaprakash Murugesan wrote:
> ipq8074 has two PCIe ports, One Gen2 and one Gen3 ports.
> Since support for Gen2 phy is already available, add support for
> PCIe Gen3 phy.
> 
> Co-developed-by: Selvam Sathappan Periakaruppan <speriaka@...eaurora.org>
> Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@...eaurora.org>
> Signed-off-by: Sivaprakash Murugesan <sivaprak@...eaurora.org>
> ---
> [V2]
>  * Addressed review comments from Vinod
>  drivers/phy/qualcomm/phy-qcom-pcie3-qmp.h | 139 ++++++++++++++++++++++++
>  drivers/phy/qualcomm/phy-qcom-qmp.c       | 171 +++++++++++++++++++++++++++++-
>  2 files changed, 308 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/phy/qualcomm/phy-qcom-pcie3-qmp.h
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-pcie3-qmp.h b/drivers/phy/qualcomm/phy-qcom-pcie3-qmp.h
> new file mode 100644
> index 0000000..812ee75
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-pcie3-qmp.h
> @@ -0,0 +1,139 @@
> +/* SPDX-License-Identifier: GPL-2.0
> + */
> +
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + */
> +
> +#ifndef PHY_QCOM_PCIE_H

Kernel uses this convention..
#ifndef PHY_QCOM_PCIE_H
#define PHY_QCOM_PCIE_H

header contents

#endif

Please update

> +
> +/* QMP V2 PCIE PHY - Found in IPQ8074 gen3 port - QSERDES PLL registers */
> +#define QSERDES_PLL_BG_TIMER				0x00c
> +#define QSERDES_PLL_SSC_PER1				0x01c
> +#define QSERDES_PLL_SSC_PER2				0x020
> +#define QSERDES_PLL_SSC_STEP_SIZE1_MODE0		0x024
> +#define QSERDES_PLL_SSC_STEP_SIZE2_MODE0		0x028
> +#define QSERDES_PLL_SSC_STEP_SIZE1_MODE1		0x02c
> +#define QSERDES_PLL_SSC_STEP_SIZE2_MODE1		0x030
> +#define QSERDES_PLL_BIAS_EN_CLKBUFLR_EN			0x03c
> +#define QSERDES_PLL_CLK_ENABLE1				0x040
> +#define QSERDES_PLL_SYS_CLK_CTRL			0x044
> +#define QSERDES_PLL_SYSCLK_BUF_ENABLE			0x048
> +#define QSERDES_PLL_PLL_IVCO				0x050
> +#define QSERDES_PLL_LOCK_CMP1_MODE0			0x054
> +#define QSERDES_PLL_LOCK_CMP2_MODE0			0x058
> +#define QSERDES_PLL_LOCK_CMP1_MODE1			0x060
> +#define QSERDES_PLL_LOCK_CMP2_MODE1			0x064
> +#define QSERDES_PLL_BG_TRIM				0x074
> +#define QSERDES_PLL_CLK_EP_DIV_MODE0			0x078
> +#define QSERDES_PLL_CLK_EP_DIV_MODE1			0x07c
> +#define QSERDES_PLL_CP_CTRL_MODE0			0x080
> +#define QSERDES_PLL_CP_CTRL_MODE1			0x084
> +#define QSERDES_PLL_PLL_RCTRL_MODE0			0x088
> +#define	QSERDES_PLL_PLL_RCTRL_MODE1			0x08C

why tab here instead of single space in others?

>  static const struct qmp_phy_cfg sdm845_qmp_pciephy_cfg = {
>  	.type = PHY_TYPE_PCIE,
>  	.nlanes = 1,
> @@ -3024,8 +3181,15 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
>  
>  	init.ops = &clk_fixed_rate_ops;
>  
> -	/* controllers using QMP phys use 125MHz pipe clock interface */
> -	fixed->fixed_rate = 125000000;
> +	/*
> +	 * controllers using QMP phys use 125MHz pipe clock interface unless
> +	 * other frequency is specified in dts
> +	 */
> +	ret = of_property_read_u32(np, "clock-output-rate",
> +				   (u32 *)&fixed->fixed_rate);

why this cast?

-- 
~Vinod