linux-kernel - [PATCH v2 06/10] power: reset: at91-reset: add at91_reset

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Message-ID: <20220407071708.3848812-7-claudiu.beznea@microchip.com>
Date:   Thu, 7 Apr 2022 10:17:04 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <robh+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <p.zabel@...gutronix.de>,
        <linux@...linux.org.uk>, <sre@...nel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v2 06/10] power: reset: at91-reset: add at91_reset_data

Add struct at91_reset_data to keep per platform related information.
This is a prerequisite for adding reset_controller_dev support.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/power/reset/at91-reset.c | 38 ++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c
index e62798750b6b..1b2aca3f490d 100644
--- a/drivers/power/reset/at91-reset.c
+++ b/drivers/power/reset/at91-reset.c
@@ -79,6 +79,16 @@ struct at91_reset {
 	u32 ramc_lpr;
 };
 
+/**
+ * struct at91_reset_data - AT91 reset data
+ * @reset_args:		SoC specific system reset arguments
+ * @n_device_reset:	number of device resets
+ */
+struct at91_reset_data {
+	u32 reset_args;
+	u32 n_device_reset;
+};
+
 /*
 * unless the SDRAM is cleanly shutdown before we hit the
 * reset register it can be left driving the data bus and
@@ -173,29 +183,34 @@ static const struct of_device_id at91_ramc_of_match[] = {
 	{ /* sentinel */ }
 };
 
+static const struct at91_reset_data sam9260 = {
+	.reset_args = AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST,
+};
+
+static const struct at91_reset_data samx7 = {
+	.reset_args = AT91_RSTC_KEY | AT91_RSTC_PROCRST,
+};
+
 static const struct of_device_id at91_reset_of_match[] = {
 	{
 		.compatible = "atmel,at91sam9260-rstc",
-		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
-				 AT91_RSTC_PROCRST),
+		.data = &sam9260,
 	},
 	{
 		.compatible = "atmel,at91sam9g45-rstc",
-		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
-				 AT91_RSTC_PROCRST)
+		.data = &sam9260,
 	},
 	{
 		.compatible = "atmel,sama5d3-rstc",
-		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
-				 AT91_RSTC_PROCRST)
+		.data = &sam9260,
 	},
 	{
 		.compatible = "atmel,samx7-rstc",
-		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PROCRST)
+		.data = &samx7,
 	},
 	{
 		.compatible = "microchip,sam9x60-rstc",
-		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PROCRST)
+		.data = &samx7,
 	},
 	{ /* sentinel */ }
 };
@@ -204,6 +219,7 @@ MODULE_DEVICE_TABLE(of, at91_reset_of_match);
 static int __init at91_reset_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
+	const struct at91_reset_data *data;
 	struct at91_reset *reset;
 	struct device_node *np;
 	int ret, idx = 0;
@@ -233,9 +249,13 @@ static int __init at91_reset_probe(struct platform_device *pdev)
 	}
 
 	match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
+	if (!match || !match->data)
+		return -ENODEV;
+
+	data = match->data;
 	reset->nb.notifier_call = at91_reset;
 	reset->nb.priority = 192;
-	reset->args = (u32)match->data;
+	reset->args = data->reset_args;
 
 	reset->sclk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(reset->sclk))
-- 
2.32.0