MFD: ti_tscadc: ADC Clock check not required

ADC is ideally expected to work at a frequency of 3MHz.
The present code had a check, which returned error if the frequency
went below the threshold  value. But since AM335x supports various
working frequencies, this check is not required.
Now the code just uses the internal ADC clock divider to set the ADC
frequency w.r.t the sys clock.

Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index b003a16..e0852ec 100644 (file)
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -197,11 +197,7 @@ static     int ti_tscadc_probe(struct platform_device *pdev)
        clock_rate = clk_get_rate(clk);
        clk_put(clk);
        clk_value = clock_rate / ADC_CLK;
-       if (clk_value < MAX_CLK_DIV) {
-               dev_err(&pdev->dev, "clock input less than min clock requirement\n");
-               err = -EINVAL;
-               goto err_disable_clk;
-       }
+
        /* TSCADC_CLKDIV needs to be configured to the value minus 1 */
        clk_value = clk_value - 1;
        tscadc_writel(tscadc, REG_CLKDIV, clk_value);

diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index 8d73fe2..71bb41c 100644 (file)
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -114,7 +114,6 @@
 #define CNTRLREG_TSCENB                BIT(7)
 
 #define ADC_CLK                        3000000
-#define        MAX_CLK_DIV             7
 #define TOTAL_STEPS            16
 #define TOTAL_CHANNELS         8