linux-kernel - Re: [PATCH v2 1/2] mtd: rawnand: meson: discard the common MMC sub clock framework

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Date:   Fri, 28 Jan 2022 12:40:36 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Liang Yang <liang.yang@...ogic.com>
Cc:     <linux-mtd@...ts.infradead.org>, Rob Herring <robh+dt@...nel.org>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        XianWei Zhao <xianwei.zhao@...ogic.com>,
        Kelvin Zhang <kelvin.zhang@...ogic.com>,
        BiChao Zheng <bichao.zheng@...ogic.com>,
        YongHui Yu <yonghui.yu@...ogic.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] mtd: rawnand: meson: discard the common MMC sub
 clock framework

Hi Liang,

liang.yang@...ogic.com wrote on Fri, 28 Jan 2022 19:32:36 +0800:

> EMMC and NAND has the same clock control register named 'SD_EMMC_CLOCK' which is

have

> defined in EMMC port internally. bit0~5 of 'SD_EMMC_CLOCK' is the divider and
> bit6~7 is the mux for fix pll and xtal.

> Previously a common MMC sub clock framework is implemented and shared by EMMC and

I believe you meant that this hasa already been contributed? I would
then rephrase with:

A common MMC and NAND sub-clock has been implemented and can be used by
the eMMC and NAND controller (which are mutually exclusive anyway).

Let's use this new clock.

> NAND, but that is coupling the EMMC and NAND, although EMMC and NAND is mutually
> exclusive.
> 
> Change-Id: Ibeb4c7ff886f5886aac4d6c664d7bbd1b1bcb997

No change Ids.

> Signed-off-by: Liang Yang <liang.yang@...ogic.com>
> ---
>  drivers/mtd/nand/raw/meson_nand.c | 161 +++++++++++++++++-------------
>  1 file changed, 89 insertions(+), 72 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index ac3be92872d0..f6a3d5c2ea1c 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -2,7 +2,7 @@
>  /*
>   * Amlogic Meson Nand Flash Controller Driver
>   *
> - * Copyright (c) 2018 Amlogic, inc.
> + * Copyright (c) 2018-2021 Amlogic, inc.

Please don't.

>   * Author: Liang Yang <liang.yang@...ogic.com>
>   */
>  
> @@ -10,6 +10,7 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/interrupt.h>
>  #include <linux/clk.h>
> +#include <linux/clk-provider.h>
>  #include <linux/mtd/rawnand.h>
>  #include <linux/mtd/mtd.h>
>  #include <linux/mfd/syscon.h>
> @@ -19,6 +20,7 @@
>  #include <linux/iopoll.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/of_address.h>
>  #include <linux/sched/task_stack.h>
>  
>  #define NFC_REG_CMD		0x00
> @@ -104,6 +106,9 @@
>  
>  #define PER_INFO_BYTE		8
>  
> +#define CLK_DIV_SHIFT		0
> +#define CLK_DIV_WIDTH		6
> +
>  struct meson_nfc_nand_chip {
>  	struct list_head node;
>  	struct nand_chip nand;
> @@ -151,15 +156,17 @@ struct meson_nfc {
>  	struct nand_controller controller;
>  	struct clk *core_clk;
>  	struct clk *device_clk;
> -	struct clk *phase_tx;
> -	struct clk *phase_rx;
> +	struct clk *nand_clk;
> +	struct clk_divider nand_divider;
>  
>  	unsigned long clk_rate;
>  	u32 bus_timing;
>  
>  	struct device *dev;
> -	void __iomem *reg_base;
> -	struct regmap *reg_clk;
> +	struct {
> +		void __iomem *reg_base;
> +		void __iomem *sd_emmc_clock;
> +	} res;

Please split your commit: first the mechanical changes, then the use of
the new area or something like that.

Otherwise there are too many lines changed, I can't spot where it is
interesting.

Thanks,
Miquèl