linux-kernel - [PATCH 8/9] soc: sunxi: sram: Export the LDO control register

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Message-Id: <20220801030509.21966-9-samuel@sholland.org>
Date:   Sun, 31 Jul 2022 22:05:08 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Samuel Holland <samuel@...lland.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hans de Goede <hdegoede@...hat.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: [PATCH 8/9] soc: sunxi: sram: Export the LDO control register

Some newer Allwinner SoCs contain internal LDOs managed by a register in
the system control MMIO space. Export this from the regmap in addtion to
the EMAC register.

Use generic names now that the regmap is no longer EMAC-specific.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---

 drivers/soc/sunxi/sunxi_sram.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c
index 7c6fb17cfe7f..7e8dab0f0ec4 100644
--- a/drivers/soc/sunxi/sunxi_sram.c
+++ b/drivers/soc/sunxi/sunxi_sram.c
@@ -283,6 +283,7 @@ EXPORT_SYMBOL(sunxi_sram_release);
 
 struct sunxi_sramc_variant {
 	int num_emac_clocks;
+	bool has_ldo_ctrl;
 };
 
 static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = {
@@ -302,25 +303,28 @@ static const struct sunxi_sramc_variant sun50i_h616_sramc_variant = {
 };
 
 #define SUNXI_SRAM_EMAC_CLOCK_REG	0x30
+#define SUNXI_SYS_LDO_CTRL_REG		0x150
+
 static bool sunxi_sram_regmap_accessible_reg(struct device *dev,
 					     unsigned int reg)
 {
 	const struct sunxi_sramc_variant *variant = dev_get_drvdata(dev);
 
-	if (reg < SUNXI_SRAM_EMAC_CLOCK_REG)
-		return false;
-	if (reg > SUNXI_SRAM_EMAC_CLOCK_REG + variant->num_emac_clocks * 4)
-		return false;
+	if (reg >= SUNXI_SRAM_EMAC_CLOCK_REG &&
+	    reg <  SUNXI_SRAM_EMAC_CLOCK_REG + variant->num_emac_clocks * 4)
+		return true;
+	if (reg == SUNXI_SYS_LDO_CTRL_REG && variant->has_ldo_ctrl)
+		return true;
 
-	return true;
+	return false;
 }
 
-static struct regmap_config sunxi_sram_emac_clock_regmap = {
+static struct regmap_config sunxi_sram_regmap_config = {
 	.reg_bits       = 32,
 	.val_bits       = 32,
 	.reg_stride     = 4,
 	/* last defined register */
-	.max_register   = SUNXI_SRAM_EMAC_CLOCK_REG + 4,
+	.max_register   = SUNXI_SYS_LDO_CTRL_REG,
 	/* other devices have no business accessing other registers */
 	.readable_reg	= sunxi_sram_regmap_accessible_reg,
 	.writeable_reg	= sunxi_sram_regmap_accessible_reg,
@@ -328,9 +332,9 @@ static struct regmap_config sunxi_sram_emac_clock_regmap = {
 
 static int __init sunxi_sram_probe(struct platform_device *pdev)
 {
-	struct regmap *emac_clock;
 	const struct sunxi_sramc_variant *variant;
 	struct device *dev = &pdev->dev;
+	struct regmap *regmap;
 
 	sram_dev = &pdev->dev;
 
@@ -344,12 +348,10 @@ static int __init sunxi_sram_probe(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	if (variant->num_emac_clocks > 0) {
-		emac_clock = devm_regmap_init_mmio(&pdev->dev, base,
-						   &sunxi_sram_emac_clock_regmap);
-
-		if (IS_ERR(emac_clock))
-			return PTR_ERR(emac_clock);
+	if (variant->num_emac_clocks || variant->has_ldo_ctrl) {
+		regmap = devm_regmap_init_mmio(dev, base, &sunxi_sram_regmap_config);
+		if (IS_ERR(regmap))
+			return PTR_ERR(regmap);
 	}
 
 	of_platform_populate(dev->of_node, NULL, NULL, dev);
-- 
2.35.1