linux-kernel - Re: [PATCH 2/3] memory: atmel-sdramc: remove the driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2f9793fb-8840-fd3c-8af1-42c6c11ed475@microchip.com>
Date:   Tue, 3 Jan 2023 10:00:17 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <krzysztof.kozlowski@...aro.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] memory: atmel-sdramc: remove the driver

Hi, Krzysztof,

On 08.12.2022 13:45, Claudiu Beznea wrote:
> Driver does only clock request + enable for DDR clocks. DDR clocks are
> enabled by bootloader and need to stay that way in Linux. To avoid having
> these clocks disabled by clock subsystem in case there are no Linux
> consumers for them the clocks were marked as critical in clock drivers.
> With this, there is no need to have a separate driver that only does
> clock request + enable.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

As this patch depends on patch 1/3 from this series, can I have your ack
for it to take it though clock tree?

Thank you,
Claudiu

> ---
>  drivers/memory/Makefile       |  1 -
>  drivers/memory/atmel-sdramc.c | 76 -----------------------------------
>  2 files changed, 77 deletions(-)
>  delete mode 100644 drivers/memory/atmel-sdramc.c
> 
> diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
> index e148f636c082..d1836be010ec 100644
> --- a/drivers/memory/Makefile
> +++ b/drivers/memory/Makefile
> @@ -8,7 +8,6 @@ ifeq ($(CONFIG_DDR),y)
>  obj-$(CONFIG_OF)		+= of_memory.o
>  endif
>  obj-$(CONFIG_ARM_PL172_MPMC)	+= pl172.o
> -obj-$(CONFIG_ATMEL_SDRAMC)	+= atmel-sdramc.o
>  obj-$(CONFIG_ATMEL_EBI)		+= atmel-ebi.o
>  obj-$(CONFIG_BRCMSTB_DPFE)	+= brcmstb_dpfe.o
>  obj-$(CONFIG_BRCMSTB_MEMC)	+= brcmstb_memc.o
> diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c
> deleted file mode 100644
> index 9c49d00c2a96..000000000000
> --- a/drivers/memory/atmel-sdramc.c
> +++ /dev/null
> @@ -1,76 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * Atmel (Multi-port DDR-)SDRAM Controller driver
> - *
> - * Author: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> - *
> - * Copyright (C) 2014 Atmel
> - */
> -
> -#include <linux/clk.h>
> -#include <linux/err.h>
> -#include <linux/kernel.h>
> -#include <linux/init.h>
> -#include <linux/of_platform.h>
> -#include <linux/platform_device.h>
> -
> -struct at91_ramc_caps {
> -	bool has_ddrck;
> -	bool has_mpddr_clk;
> -};
> -
> -static const struct at91_ramc_caps at91rm9200_caps = { };
> -
> -static const struct at91_ramc_caps at91sam9g45_caps = {
> -	.has_ddrck = 1,
> -	.has_mpddr_clk = 0,
> -};
> -
> -static const struct at91_ramc_caps sama5d3_caps = {
> -	.has_ddrck = 1,
> -	.has_mpddr_clk = 1,
> -};
> -
> -static const struct of_device_id atmel_ramc_of_match[] = {
> -	{ .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },
> -	{ .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },
> -	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },
> -	{ .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },
> -	{},
> -};
> -
> -static int atmel_ramc_probe(struct platform_device *pdev)
> -{
> -	const struct at91_ramc_caps *caps;
> -	struct clk *clk;
> -
> -	caps = of_device_get_match_data(&pdev->dev);
> -
> -	if (caps->has_ddrck) {
> -		clk = devm_clk_get(&pdev->dev, "ddrck");
> -		if (IS_ERR(clk))
> -			return PTR_ERR(clk);
> -		clk_prepare_enable(clk);
> -	}
> -
> -	if (caps->has_mpddr_clk) {
> -		clk = devm_clk_get(&pdev->dev, "mpddr");
> -		if (IS_ERR(clk)) {
> -			pr_err("AT91 RAMC: couldn't get mpddr clock\n");
> -			return PTR_ERR(clk);
> -		}
> -		clk_prepare_enable(clk);
> -	}
> -
> -	return 0;
> -}
> -
> -static struct platform_driver atmel_ramc_driver = {
> -	.probe		= atmel_ramc_probe,
> -	.driver		= {
> -		.name	= "atmel-ramc",
> -		.of_match_table = atmel_ramc_of_match,
> -	},
> -};
> -
> -builtin_platform_driver(atmel_ramc_driver);