linux-kernel - [PATCH 3/7] soc: renesas: r9a06g032-sysctrl: Handle h2mode device-tree property

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Message-Id: <20221107135825.583877-4-herve.codina@bootlin.com>
Date:   Mon,  7 Nov 2022 14:58:21 +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 3/7] soc: renesas: r9a06g032-sysctrl: Handle h2mode device-tree property

Handle the h2mode property and forces the CFG_USB[H2MODE] bit
accordingly.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 drivers/clk/renesas/r9a06g032-clocks.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/clk/renesas/r9a06g032-clocks.c b/drivers/clk/renesas/r9a06g032-clocks.c
index c07131c47a9f..562c2aba910b 100644
--- a/drivers/clk/renesas/r9a06g032-clocks.c
+++ b/drivers/clk/renesas/r9a06g032-clocks.c
@@ -946,6 +946,7 @@ static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
 	struct clk *mclk;
 	unsigned int i;
 	u16 uart_group_sel[2];
+	u32 usb, h2mode;
 	int error;
 
 	clocks = devm_kzalloc(dev, sizeof(*clocks), GFP_KERNEL);
@@ -966,6 +967,26 @@ static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
 	clocks->reg = of_iomap(np, 0);
 	if (WARN_ON(!clocks->reg))
 		return -ENOMEM;
+
+	error = of_property_read_u32(np, "renesas,h2mode", &h2mode);
+	if (!error) {
+		usb = readl(clocks->reg + R9A06G032_SYSCTRL_USB);
+		switch (h2mode) {
+		case 0:
+			/* 1 host, 1 device */
+			usb &= ~R9A06G032_SYSCTRL_USB_H2MODE;
+			break;
+		case 1:
+			/* 2 hosts */
+			usb |= R9A06G032_SYSCTRL_USB_H2MODE;
+			break;
+		default:
+			dev_err(dev, "invalid h2mode %d\n", h2mode);
+			return -EINVAL;
+		}
+		writel(usb, clocks->reg + R9A06G032_SYSCTRL_USB);
+	}
+
 	for (i = 0; i < ARRAY_SIZE(r9a06g032_clocks); ++i) {
 		const struct r9a06g032_clkdesc *d = &r9a06g032_clocks[i];
 		const char *parent_name = d->source ?
-- 
2.37.3