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

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Date:   Thu, 8 Dec 2022 13:45:14 +0200
From:   Claudiu Beznea <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>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 2/3] 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.
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>
---
 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);
-- 
2.34.1