[PATCH v5 11/36] i2c: tegra: Use clk-bulk helpers

Dmitry Osipenko
2020-09-06T18:56:07Z

Use clk-bulk helpers and factor out clocks initialization into separate
function in order to make code cleaner.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/i2c/busses/i2c-tegra.c | 184 ++++++++++++---------------------
1 file changed, 65 insertions(+), 119 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 435449d7d895..6021b9bcd802 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -165,9 +165,6 @@ enum msg_end_type {
* @has_continue_xfer_support: Continue transfer supports.
* @has_per_pkt_xfer_complete_irq: Has enable/disable capability for transfer
* complete interrupt per packet basis.
- * @has_single_clk_source: The I2C controller has single clock source. Tegra30
- * and earlier SoCs have two clock sources i.e. div-clk and
- * fast-clk.
* @has_config_load_reg: Has the config load register to load the new
* configuration.
* @clk_divisor_hs_mode: Clock divisor in HS mode.
@@ -208,7 +205,6 @@ enum msg_end_type {
struct tegra_i2c_hw_feature {
bool has_continue_xfer_support;
bool has_per_pkt_xfer_complete_irq;
- bool has_single_clk_source;
bool has_config_load_reg;
int clk_divisor_hs_mode;
int clk_divisor_std_mode;
@@ -236,7 +232,8 @@ struct tegra_i2c_hw_feature {
* @hw: Tegra I2C HW feature
* @adapter: core I2C layer adapter information
* @div_clk: clock reference for div clock of I2C controller
- * @fast_clk: clock reference for fast clock of I2C controller
+ * @clocks: array of I2C controller clocks
+ * @nclocks: number of clocks in the array
* @rst: reset control for the I2C controller
* @base: ioremapped registers cookie
* @base_phys: physical base address of the I2C controller
@@ -265,8 +262,8 @@ struct tegra_i2c_dev {
const struct tegra_i2c_hw_feature *hw;
struct i2c_adapter adapter;
struct clk *div_clk;
- struct clk *fast_clk;
- struct clk *slow_clk;
+ struct clk_bulk_data *clocks;
+ unsigned int nclocks;
struct reset_control *rst;
void __iomem *base;
phys_addr_t base_phys;
@@ -662,25 +659,9 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
if (ret)
return ret;

- ret = clk_enable(i2c_dev->fast_clk);
- if (ret < 0) {
- dev_err(i2c_dev->dev,
- "Enabling fast clk failed, err %d\n", ret);
+ ret = clk_bulk_enable(i2c_dev->nclocks, i2c_dev->clocks);
+ if (ret)
return ret;
- }
-
- ret = clk_enable(i2c_dev->slow_clk);
- if (ret < 0) {
- dev_err(dev, "failed to enable slow clock: %d\n", ret);
- goto disable_fast_clk;
- }
-
- ret = clk_enable(i2c_dev->div_clk);
- if (ret < 0) {
- dev_err(i2c_dev->dev,
- "Enabling div clk failed, err %d\n", ret);
- goto disable_slow_clk;
- }

/*
* VI I2C device is attached to VE power domain which goes through
@@ -691,17 +672,14 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
if (i2c_dev->is_vi) {
ret = tegra_i2c_init(i2c_dev);
if (ret)
- goto disable_div_clk;
+ goto disable_clocks;
}

return 0;

-disable_div_clk:
- clk_disable(i2c_dev->div_clk);
-disable_slow_clk:
- clk_disable(i2c_dev->slow_clk);
-disable_fast_clk:
- clk_disable(i2c_dev->fast_clk);
+disable_clocks:
+ clk_bulk_disable(i2c_dev->nclocks, i2c_dev->clocks);
+
return ret;
}

@@ -709,9 +687,7 @@ static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
{
struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);

- clk_disable(i2c_dev->div_clk);
- clk_disable(i2c_dev->slow_clk);
- clk_disable(i2c_dev->fast_clk);
+ clk_bulk_disable(i2c_dev->nclocks, i2c_dev->clocks);

return pinctrl_pm_select_idle_state(i2c_dev->dev);
}
@@ -1469,7 +1445,6 @@ static struct i2c_bus_recovery_info tegra_i2c_recovery_info = {
static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
.has_continue_xfer_support = false,
.has_per_pkt_xfer_complete_irq = false,
- .has_single_clk_source = false,
.clk_divisor_hs_mode = 3,
.clk_divisor_std_mode = 0,
.clk_divisor_fast_mode = 0,
@@ -1494,7 +1469,6 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = false,
- .has_single_clk_source = false,
.clk_divisor_hs_mode = 3,
.clk_divisor_std_mode = 0,
.clk_divisor_fast_mode = 0,
@@ -1519,7 +1493,6 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
- .has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
@@ -1544,7 +1517,6 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
- .has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
@@ -1569,7 +1541,6 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
- .has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
@@ -1594,7 +1565,6 @@ static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
- .has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_mode = 0x16,
.clk_divisor_fast_mode = 0x19,
@@ -1619,7 +1589,6 @@ static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
- .has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_mode = 0x4f,
.clk_divisor_fast_mode = 0x3c,
@@ -1656,13 +1625,58 @@ static const struct of_device_id tegra_i2c_of_match[] = {
};
MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);

+static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)
+{
+ unsigned int i;
+ int err;
+
+ err = devm_clk_bulk_get_all(i2c_dev->dev, &i2c_dev->clocks);
+ if (err < 0)
+ return err;
+
+ i2c_dev->nclocks = err;
+
+ err = clk_bulk_prepare(i2c_dev->nclocks, i2c_dev->clocks);
+ if (err)
+ return err;
+
+ for (i = 0; i < i2c_dev->nclocks; i++) {
+ if (!strcmp(i2c_dev->clocks[i].id, "div-clk")) {
+ i2c_dev->div_clk = i2c_dev->clocks[i].clk;
+ break;
+ }
+ }
+
+ if (!i2c_dev->is_multimaster_mode)
+ return 0;
+
+ err = clk_enable(i2c_dev->div_clk);
+ if (err) {
+ dev_err(i2c_dev->dev, "failed to enable div-clk: %d\n", err);
+ goto unprepare_clocks;
+ }
+
+ return 0;
+
+unprepare_clocks:
+ clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
+
+ return err;
+}
+
+static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
+{
+ if (i2c_dev->is_multimaster_mode)
+ clk_disable(i2c_dev->div_clk);
+
+ clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
+}
+
static int tegra_i2c_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct tegra_i2c_dev *i2c_dev;
struct resource *res;
- struct clk *div_clk;
- struct clk *fast_clk;
void __iomem *base;
phys_addr_t base_phys;
int irq;
@@ -1678,21 +1692,12 @@ static int tegra_i2c_probe(struct platform_device *pdev)
if (irq < 0)
return irq;

- div_clk = devm_clk_get(&pdev->dev, "div-clk");
- if (IS_ERR(div_clk)) {
- if (PTR_ERR(div_clk) != -EPROBE_DEFER)
- dev_err(&pdev->dev, "missing controller clock\n");
-
- return PTR_ERR(div_clk);
- }
-
i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
if (!i2c_dev)
return -ENOMEM;

i2c_dev->base = base;
i2c_dev->base_phys = base_phys;
- i2c_dev->div_clk = div_clk;
i2c_dev->adapter.algo = &tegra_i2c_algo;
i2c_dev->adapter.retries = 1;
i2c_dev->adapter.timeout = 6 * HZ;
@@ -1708,6 +1713,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)

tegra_i2c_parse_dt(i2c_dev);

+ ret = tegra_i2c_init_clocks(i2c_dev);
+ if (ret)
+ return ret;
+
i2c_dev->hw = of_device_get_match_data(&pdev->dev);
i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
"nvidia,tegra20-i2c-dvc");
@@ -1719,46 +1728,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
init_completion(&i2c_dev->msg_complete);
init_completion(&i2c_dev->dma_complete);

- if (!i2c_dev->hw->has_single_clk_source) {
- fast_clk = devm_clk_get(&pdev->dev, "fast-clk");
- if (IS_ERR(fast_clk)) {
- dev_err(&pdev->dev, "missing fast clock\n");
- return PTR_ERR(fast_clk);
- }
- i2c_dev->fast_clk = fast_clk;
- }
-
- if (i2c_dev->is_vi) {
- i2c_dev->slow_clk = devm_clk_get(dev, "slow");
- if (IS_ERR(i2c_dev->slow_clk)) {
- if (PTR_ERR(i2c_dev->slow_clk) != -EPROBE_DEFER)
- dev_err(dev, "failed to get slow clock: %ld\n",
- PTR_ERR(i2c_dev->slow_clk));
-
- return PTR_ERR(i2c_dev->slow_clk);
- }
- }
-
platform_set_drvdata(pdev, i2c_dev);

- ret = clk_prepare(i2c_dev->fast_clk);
- if (ret < 0) {
- dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
- return ret;
- }
-
- ret = clk_prepare(i2c_dev->slow_clk);
- if (ret < 0) {
- dev_err(dev, "failed to prepare slow clock: %d\n", ret);
- goto unprepare_fast_clk;
- }
-
- ret = clk_prepare(i2c_dev->div_clk);
- if (ret < 0) {
- dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
- goto unprepare_slow_clk;
- }
-
/*
* VI I2C is in VE power domain which is not always on and not
* an IRQ safe. So, IRQ safe device can't be attached to a non-IRQ
@@ -1775,21 +1746,12 @@ static int tegra_i2c_probe(struct platform_device *pdev)
goto disable_rpm;
}

- if (i2c_dev->is_multimaster_mode) {
- ret = clk_enable(i2c_dev->div_clk);
- if (ret < 0) {
- dev_err(i2c_dev->dev, "div_clk enable failed %d\n",
- ret);
- goto put_rpm;
- }
- }
-
if (i2c_dev->hw->supports_bus_clear)
i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;

ret = tegra_i2c_init_dma(i2c_dev);
if (ret < 0)
- goto disable_div_clk;
+ goto put_rpm;

ret = tegra_i2c_init(i2c_dev);
if (ret) {
@@ -1824,22 +1786,12 @@ static int tegra_i2c_probe(struct platform_device *pdev)
release_dma:
tegra_i2c_release_dma(i2c_dev);

-disable_div_clk:
- if (i2c_dev->is_multimaster_mode)
- clk_disable(i2c_dev->div_clk);
-
put_rpm:
pm_runtime_put_sync(&pdev->dev);

disable_rpm:
pm_runtime_disable(&pdev->dev);
- clk_unprepare(i2c_dev->div_clk);
-
-unprepare_slow_clk:
- clk_unprepare(i2c_dev->slow_clk);
-
-unprepare_fast_clk:
- clk_unprepare(i2c_dev->fast_clk);
+ tegra_i2c_release_clocks(i2c_dev);

return ret;
}
@@ -1850,16 +1802,10 @@ static int tegra_i2c_remove(struct platform_device *pdev)

i2c_del_adapter(&i2c_dev->adapter);

- if (i2c_dev->is_multimaster_mode)
- clk_disable(i2c_dev->div_clk);
-
pm_runtime_disable(&pdev->dev);

- clk_unprepare(i2c_dev->div_clk);
- clk_unprepare(i2c_dev->slow_clk);
- clk_unprepare(i2c_dev->fast_clk);
-
tegra_i2c_release_dma(i2c_dev);
+ tegra_i2c_release_clocks(i2c_dev);
return 0;
}

--
2.27.0