linux-kernel - [PATCH v4 7/9] mips: ralink: remove reset related code

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Message-Id: <20230617052435.359177-8-sergio.paracuellos@gmail.com>
Date:   Sat, 17 Jun 2023 07:24:33 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     linux-clk@...r.kernel.org
Cc:     linux-mips@...r.kernel.org, tsbogend@...ha.franken.de,
        john@...ozen.org, linux-kernel@...r.kernel.org,
        p.zabel@...gutronix.de, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, devicetree@...r.kernel.org,
        arinc.unal@...nc9.com
Subject: [PATCH v4 7/9] mips: ralink: remove reset related code

A proper clock driver for ralink SoCs has been added. This driver is also
a reset provider for the SoC. Hence there is no need to have reset related
code in 'arch/mips/ralink' folder anymore. The only code that remains is
the one related with mips_reboot_setup where a PCI reset is performed.
We maintain this because I cannot test old ralink board with PCI to be
sure all works if we remove also this code.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 arch/mips/ralink/common.h |  2 --
 arch/mips/ralink/of.c     |  4 ---
 arch/mips/ralink/reset.c  | 61 ---------------------------------------
 3 files changed, 67 deletions(-)

diff --git a/arch/mips/ralink/common.h b/arch/mips/ralink/common.h
index fcdfc9dc6210..b0d671442966 100644
--- a/arch/mips/ralink/common.h
+++ b/arch/mips/ralink/common.h
@@ -23,8 +23,6 @@ extern struct ralink_soc_info soc_info;
 
 extern void ralink_of_remap(void);
 
-extern void ralink_rst_init(void);
-
 extern void __init prom_soc_init(struct ralink_soc_info *soc_info);
 
 __iomem void *plat_of_remap_node(const char *node);
diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
index 4d06de77d92a..df29e6c896aa 100644
--- a/arch/mips/ralink/of.c
+++ b/arch/mips/ralink/of.c
@@ -81,10 +81,6 @@ static int __init plat_of_setup(void)
 {
 	__dt_register_buses(soc_info.compatible, "palmbus");
 
-	/* make sure that the reset controller is setup early */
-	if (ralink_soc != MT762X_SOC_MT7621AT)
-		ralink_rst_init();
-
 	return 0;
 }
 
diff --git a/arch/mips/ralink/reset.c b/arch/mips/ralink/reset.c
index 274d33078c5e..4875637ef469 100644
--- a/arch/mips/ralink/reset.c
+++ b/arch/mips/ralink/reset.c
@@ -10,7 +10,6 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/delay.h>
-#include <linux/reset-controller.h>
 
 #include <asm/reboot.h>
 
@@ -22,66 +21,6 @@
 #define RSTCTL_RESET_PCI	BIT(26)
 #define RSTCTL_RESET_SYSTEM	BIT(0)
 
-static int ralink_assert_device(struct reset_controller_dev *rcdev,
-				unsigned long id)
-{
-	u32 val;
-
-	if (id == 0)
-		return -1;
-
-	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
-	val |= BIT(id);
-	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
-
-	return 0;
-}
-
-static int ralink_deassert_device(struct reset_controller_dev *rcdev,
-				  unsigned long id)
-{
-	u32 val;
-
-	if (id == 0)
-		return -1;
-
-	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
-	val &= ~BIT(id);
-	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
-
-	return 0;
-}
-
-static int ralink_reset_device(struct reset_controller_dev *rcdev,
-			       unsigned long id)
-{
-	ralink_assert_device(rcdev, id);
-	return ralink_deassert_device(rcdev, id);
-}
-
-static const struct reset_control_ops reset_ops = {
-	.reset = ralink_reset_device,
-	.assert = ralink_assert_device,
-	.deassert = ralink_deassert_device,
-};
-
-static struct reset_controller_dev reset_dev = {
-	.ops			= &reset_ops,
-	.owner			= THIS_MODULE,
-	.nr_resets		= 32,
-	.of_reset_n_cells	= 1,
-};
-
-void ralink_rst_init(void)
-{
-	reset_dev.of_node = of_find_compatible_node(NULL, NULL,
-						"ralink,rt2880-reset");
-	if (!reset_dev.of_node)
-		pr_err("Failed to find reset controller node");
-	else
-		reset_controller_register(&reset_dev);
-}
-
 static void ralink_restart(char *command)
 {
 	if (IS_ENABLED(CONFIG_PCI)) {
-- 
2.25.1