linux-kernel - [PATCH v9 02/38] ARM: ep93xx: add regmap aux

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Message-Id: <20240326-ep93xx-v9-2-156e2ae5dfc8@maquefel.me>
Date: Tue, 26 Mar 2024 12:18:29 +0300
From: Nikita Shubin via B4 Relay <devnull+nikita.shubin.maquefel.me@...nel.org>
To: Nikita Shubin <nikita.shubin@...uefel.me>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Sergey Shtylyov <s.shtylyov@....ru>, 
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
 Thierry Reding <thierry.reding@...il.com>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v9 02/38] ARM: ep93xx: add regmap aux_dev

From: Nikita Shubin <nikita.shubin@...uefel.me>

The following driver's should be instantiated by ep93xx syscon driver:

- reboot
- pinctrl
- clock

They all require access to DEVCFG register with a shared lock held, to
avoid conflict writing to swlocked parts of DEVCFG.

Provide common resources such as base, regmap and spinlock via auxiliary
bus framework.

Tested-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
---
 include/linux/soc/cirrus/ep93xx.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/linux/soc/cirrus/ep93xx.h b/include/linux/soc/cirrus/ep93xx.h
index 56fbe2dc59b1..a27447971302 100644
--- a/include/linux/soc/cirrus/ep93xx.h
+++ b/include/linux/soc/cirrus/ep93xx.h
@@ -3,6 +3,18 @@
 #define _SOC_EP93XX_H
 
 struct platform_device;
+struct regmap;
+struct spinlock_t;
+
+enum ep93xx_soc_model {
+	EP93XX_9301_SOC,
+	EP93XX_9307_SOC,
+	EP93XX_9312_SOC,
+};
+
+#include <linux/auxiliary_bus.h>
+#include <linux/compiler_types.h>
+#include <linux/container_of.h>
 
 #define EP93XX_CHIP_REV_D0	3
 #define EP93XX_CHIP_REV_D1	4
@@ -10,6 +22,20 @@ struct platform_device;
 #define EP93XX_CHIP_REV_E1	6
 #define EP93XX_CHIP_REV_E2	7
 
+struct ep93xx_regmap_adev {
+	struct auxiliary_device adev;
+	struct regmap *map;
+	void __iomem *base;
+	spinlock_t *lock;
+	void (*write)(struct regmap *map, spinlock_t *lock, unsigned int reg,
+		      unsigned int val);
+	void (*update_bits)(struct regmap *map, spinlock_t *lock,
+			    unsigned int reg, unsigned int mask, unsigned int val);
+};
+
+#define to_ep93xx_regmap_adev(_adev) \
+	container_of((_adev), struct ep93xx_regmap_adev, adev)
+
 #ifdef CONFIG_ARCH_EP93XX
 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev);
 void ep93xx_pwm_release_gpio(struct platform_device *pdev);

-- 
2.41.0