linux-kernel - [PATCH v2 1/2] i2c: tegra: allow DVC support to be compiled out

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Message-Id: <ebe847bb25016e743c28bd38a10c966b04b06cc8.1642535860.git.mirq-linux@rere.qmqm.pl>
Date:   Tue, 18 Jan 2022 21:00:05 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Laxman Dewangan <ldewangan@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] i2c: tegra: allow DVC support to be compiled out

Save a bit of code for newer Tegra platforms by compiling out
DVC's I2C mode support that's used only for Tegra2.

$ size i2c-tegra.o
    text    data     bss     dec     hex filename
-  10385     240       8   10633    2989 i2c-tegra.o
+   9617     240       8    9865    2689 i2c-tegra.o

---
v2: remove KConfig symbol as per Dmitry Osipenko's suggestion.
    (Assuming that for Tegra20 the DVC part will be used anyway.)

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/i2c/busses/i2c-tegra.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index b3184c422826..96bfe7013d85 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -294,6 +294,8 @@ struct tegra_i2c_dev {
 	bool is_vi;
 };
 
+#define IS_DVC(dev) (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && dev->is_dvc)
+
 static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
 		       unsigned int reg)
 {
@@ -311,7 +313,7 @@ static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned int reg)
  */
 static u32 tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev, unsigned int reg)
 {
-	if (i2c_dev->is_dvc)
+	if (IS_DVC(i2c_dev))
 		reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
 	else if (i2c_dev->is_vi)
 		reg = 0xc00 + (reg << 2);
@@ -621,7 +623,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 	err = reset_control_reset(i2c_dev->rst);
 	WARN_ON_ONCE(err);
 
-	if (i2c_dev->is_dvc)
+	if (IS_DVC(i2c_dev))
 		tegra_dvc_init(i2c_dev);
 
 	val = I2C_CNFG_NEW_MASTER_FSM | I2C_CNFG_PACKET_MODE_EN |
@@ -685,7 +687,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 		return err;
 	}
 
-	if (!i2c_dev->is_dvc && !i2c_dev->is_vi) {
+	if (!IS_DVC(i2c_dev) && !i2c_dev->is_vi) {
 		u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
 
 		sl_cfg |= I2C_SL_CNFG_NACK | I2C_SL_CNFG_NEWSL;
@@ -915,7 +917,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 	}
 
 	i2c_writel(i2c_dev, status, I2C_INT_STATUS);
-	if (i2c_dev->is_dvc)
+	if (IS_DVC(i2c_dev))
 		dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);
 
 	/*
@@ -954,7 +956,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 
 	i2c_writel(i2c_dev, status, I2C_INT_STATUS);
 
-	if (i2c_dev->is_dvc)
+	if (IS_DVC(i2c_dev))
 		dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);
 
 	if (i2c_dev->dma_mode) {
@@ -1616,7 +1618,9 @@ static const struct of_device_id tegra_i2c_of_match[] = {
 	{ .compatible = "nvidia,tegra114-i2c", .data = &tegra114_i2c_hw, },
 	{ .compatible = "nvidia,tegra30-i2c", .data = &tegra30_i2c_hw, },
 	{ .compatible = "nvidia,tegra20-i2c", .data = &tegra20_i2c_hw, },
+#if IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC)
 	{ .compatible = "nvidia,tegra20-i2c-dvc", .data = &tegra20_i2c_hw, },
+#endif
 	{},
 };
 MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
@@ -1635,7 +1639,8 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
 	multi_mode = of_property_read_bool(np, "multi-master");
 	i2c_dev->multimaster_mode = multi_mode;
 
-	if (of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc"))
+	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) &&
+	    of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc"))
 		i2c_dev->is_dvc = true;
 
 	if (of_device_is_compatible(np, "nvidia,tegra210-i2c-vi"))
-- 
2.30.2