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memory: atmel-sdramc: remove the driver 

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
(in commit 68b3b6f177 ("clk: at91: mark ddr clocks as critical")).
With this, there is no need to have a separate driver that only does
clock request + enable.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230516072405.2696225-1-claudiu.beznea@microchip.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This commit is contained in:
Claudiu Beznea 2023-05-16 10:24:05 +03:00 committed by Krzysztof Kozlowski
parent 1d9e93fad5
commit d3369a4b6f
4 changed files with 0 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/mach-at91/Kconfig
View File

@ -97,7 +97,6 @@ config SOC_AT91SAM9
depends on ARCH_MULTI_V5
select ATMEL_AIC_IRQ
select ATMEL_PM if PM
select ATMEL_SDRAMC
select CPU_ARM926T
select HAVE_AT91_SMD
select HAVE_AT91_USB_CLK
@ -131,7 +130,6 @@ config SOC_SAM9X60
depends on ARCH_MULTI_V5
select ATMEL_AIC5_IRQ
select ATMEL_PM if PM
select ATMEL_SDRAMC
select CPU_ARM926T
select HAVE_AT91_USB_CLK
select HAVE_AT91_GENERATED_CLK
@ -213,7 +211,6 @@ config SOC_SAMA5
bool
select ATMEL_AIC5_IRQ
select ATMEL_PM if PM
select ATMEL_SDRAMC
select MEMORY
select SOC_SAM_V7
select SRAM if PM
@ -234,7 +231,6 @@ config SOC_SAMA7
bool
select ARM_GIC
select ATMEL_PM if PM
select ATMEL_SDRAMC
select MEMORY
select SOC_SAM_V7
select SRAM if PM

11
drivers/memory/Kconfig
View File

@ -30,17 +30,6 @@ config ARM_PL172_MPMC
If you have an embedded system with an AMBA bus and a PL172
controller, say Y or M here.
config ATMEL_SDRAMC
bool "Atmel (Multi-port DDR-)SDRAM Controller"
default y if ARCH_AT91
depends on ARCH_AT91 || COMPILE_TEST
depends on OF
help
This driver is for Atmel SDRAM Controller or Atmel Multi-port
DDR-SDRAM Controller available on Atmel AT91SAM9 and SAMA5 SoCs.
Starting with the at91sam9g45, this controller supports SDR, DDR and
LP-DDR memories.
config ATMEL_EBI
bool "Atmel EBI driver"
default y if ARCH_AT91

1
drivers/memory/Makefile
View File

@ -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

74
drivers/memory/atmel-sdramc.c
View File

@ -1,74 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Atmel (Multi-port DDR-)SDRAM Controller driver
*
* Author: Alexandre Belloni <alexandre.belloni@free-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_enabled(&pdev->dev, "ddrck");
if (IS_ERR(clk))
return PTR_ERR(clk);
}
if (caps->has_mpddr_clk) {
clk = devm_clk_get_enabled(&pdev->dev, "mpddr");
if (IS_ERR(clk)) {
pr_err("AT91 RAMC: couldn't get mpddr clock\n");
return PTR_ERR(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);