linux-kernel - [PATCH v2 1/7] soc: renesas: r9a06g032-sysctrl: Export function to get the usb role

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Message-Id: <20221114111513.1436165-2-herve.codina@bootlin.com>
Date:   Mon, 14 Nov 2022 12:15:07 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Herve Codina <herve.codina@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Gareth Williams <gareth.williams.jx@...esas.com>
Cc:     linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v2 1/7] soc: renesas: r9a06g032-sysctrl: Export function to get the usb role

The usb role retrieved is determined from the CFG_USB[H2MODE]
value. The CFG_USB register is located within the system
controller.

We need a helper to get the usb role based on H2MODE value from
the CFG_USB register without syscon.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 drivers/clk/renesas/r9a06g032-clocks.c        | 18 ++++++++++++++++++
 include/linux/soc/renesas/r9a06g032-sysctrl.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/clk/renesas/r9a06g032-clocks.c b/drivers/clk/renesas/r9a06g032-clocks.c
index 1488c9d6e639..9ee056498714 100644
--- a/drivers/clk/renesas/r9a06g032-clocks.c
+++ b/drivers/clk/renesas/r9a06g032-clocks.c
@@ -23,8 +23,11 @@
 #include <linux/slab.h>
 #include <linux/soc/renesas/r9a06g032-sysctrl.h>
 #include <linux/spinlock.h>
+#include <linux/usb/role.h>
 #include <dt-bindings/clock/r9a06g032-sysctrl.h>
 
+#define R9A06G032_SYSCTRL_USB    0x00
+#define R9A06G032_SYSCTRL_USB_H2MODE  (1<<1)
 #define R9A06G032_SYSCTRL_DMAMUX 0xA0
 
 struct r9a06g032_gate {
@@ -341,6 +344,21 @@ int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val)
 }
 EXPORT_SYMBOL_GPL(r9a06g032_sysctrl_set_dmamux);
 
+
+/* Exported helper to get the H2MODE bit from USB register */
+int r9a06g032_sysctrl_get_usb_role(void)
+{
+	u32 usb;
+
+	if (!sysctrl_priv)
+		return -EPROBE_DEFER;
+
+	usb = readl(sysctrl_priv->reg + R9A06G032_SYSCTRL_USB);
+	return (usb & R9A06G032_SYSCTRL_USB_H2MODE) ?
+		USB_ROLE_HOST : USB_ROLE_DEVICE;
+}
+EXPORT_SYMBOL_GPL(r9a06g032_sysctrl_get_usb_role);
+
 /* register/bit pairs are encoded as an uint16_t */
 static void
 clk_rdesc_set(struct r9a06g032_priv *clocks,
diff --git a/include/linux/soc/renesas/r9a06g032-sysctrl.h b/include/linux/soc/renesas/r9a06g032-sysctrl.h
index 066dfb15cbdd..fc18d013a498 100644
--- a/include/linux/soc/renesas/r9a06g032-sysctrl.h
+++ b/include/linux/soc/renesas/r9a06g032-sysctrl.h
@@ -4,8 +4,10 @@
 
 #ifdef CONFIG_CLK_R9A06G032
 int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val);
+int r9a06g032_sysctrl_get_usb_role(void);
 #else
 static inline int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val) { return -ENODEV; }
+static inline int r9a06g032_sysctrl_get_usb_role(void) { return -ENODEV; }
 #endif
 
 #endif /* __LINUX_SOC_RENESAS_R9A06G032_SYSCTRL_H__ */
-- 
2.38.1