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i2c: ocores: rework clk code to handle NULL cookie 

For, !HAVE_CLK the clk API returns a NULL cookie. Rework the
initialization code to handle that. If clk_get_rate() delivers 0, we use
the fallback mechanisms. The patch is pretty easy when ignoring white
space issues (git diff -b).

Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Wolfram Sang 2015-02-19 17:22:34 +01:00
parent b4ad0510f5
commit 0d8fb59924
1 changed files with 21 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/i2c/busses/i2c-ocores.c
View File

@ -354,20 +354,24 @@ static int ocores_i2c_of_probe(struct platform_device *pdev,
i2c->ip_clock_khz = clk_get_rate(i2c->clk) / 1000;
if (clock_frequency_present)
i2c->bus_clock_khz = clock_frequency / 1000;
} else if (of_property_read_u32(np, "opencores,ip-clock-frequency",
&val)) {
if (!clock_frequency_present) {
dev_err(&pdev->dev,
"Missing required parameter 'opencores,ip-clock-frequency'\n");
return -ENODEV;
}
if (i2c->ip_clock_khz == 0) {
if (of_property_read_u32(np, "opencores,ip-clock-frequency",
&val)) {
if (!clock_frequency_present) {
dev_err(&pdev->dev,
"Missing required parameter 'opencores,ip-clock-frequency'\n");
return -ENODEV;
}
i2c->ip_clock_khz = clock_frequency / 1000;
dev_warn(&pdev->dev,
"Deprecated usage of the 'clock-frequency' property, please update to 'opencores,ip-clock-frequency'\n");
} else {
i2c->ip_clock_khz = val / 1000;
if (clock_frequency_present)
i2c->bus_clock_khz = clock_frequency / 1000;
}
i2c->ip_clock_khz = clock_frequency / 1000;
dev_warn(&pdev->dev,
"Deprecated usage of the 'clock-frequency' property, please update to 'opencores,ip-clock-frequency'\n");
} else {
i2c->ip_clock_khz = val / 1000;
if (clock_frequency_present)
i2c->bus_clock_khz = clock_frequency / 1000;
}
of_property_read_u32(pdev->dev.of_node, "reg-io-width",
@ -518,6 +522,7 @@ static int ocores_i2c_resume(struct device *dev)
struct ocores_i2c *i2c = dev_get_drvdata(dev);
if (!IS_ERR(i2c->clk)) {
unsigned long rate;
int ret = clk_prepare_enable(i2c->clk);
if (ret) {
@ -525,7 +530,9 @@ static int ocores_i2c_resume(struct device *dev)
"clk_prepare_enable failed: %d\n", ret);
return ret;
}
i2c->ip_clock_khz = clk_get_rate(i2c->clk) / 1000;
rate = clk_get_rate(i2c->clk) / 1000;
if (rate)
i2c->ip_clock_khz = rate;
}
return ocores_init(dev, i2c);
}