diff options
| author | Wolfram Sang <wsa@the-dreams.de> | 2015-02-19 17:22:34 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-02-20 18:01:23 +0100 |
| commit | 0d8fb59924cf20e7bef2c41f8d4e87127f573546 (patch) | |
| tree | 9674de914ac8c29d1c17c65ea93fbe2983b4900a /drivers/i2c/busses/i2c-ocores.c | |
| parent | b4ad0510f5d9099487acf2c748b99081ab6ab869 (diff) | |
| download | linux-0d8fb59924cf20e7bef2c41f8d4e87127f573546.tar.gz | |
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>
Diffstat (limited to 'drivers/i2c/busses/i2c-ocores.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ocores.c | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index 3fc76b6ffcaa..abf5db7e441e 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -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); } |