This is a note to let you know that I've just added the patch titled
staging: iio: adc: ad7192: fix external frequency setting
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: staging-iio-adc-ad7192-fix-external-frequency-setting.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From e31b617d0a63c6558485aaa730fd162faa95a766 Mon Sep 17 00:00:00 2001
From: Alexandru Ardelean alexandru.ardelean@analog.com Date: Mon, 22 Jan 2018 11:53:12 +0200 Subject: staging: iio: adc: ad7192: fix external frequency setting
From: Alexandru Ardelean alexandru.ardelean@analog.com
commit e31b617d0a63c6558485aaa730fd162faa95a766 upstream.
The external clock frequency was set only when selecting the internal clock, which is fixed at 4.9152 Mhz.
This is incorrect, since it should be set when any of the external clock or crystal settings is selected.
Added range validation for the external (crystal/clock) frequency setting. Valid values are between 2.4576 and 5.12 Mhz.
Signed-off-by: Alexandru Ardelean alexandru.ardelean@analog.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/staging/iio/adc/ad7192.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-)
--- a/drivers/staging/iio/adc/ad7192.c +++ b/drivers/staging/iio/adc/ad7192.c @@ -124,6 +124,8 @@ #define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */ #define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */
+#define AD7192_EXT_FREQ_MHZ_MIN 2457600 +#define AD7192_EXT_FREQ_MHZ_MAX 5120000 #define AD7192_INT_FREQ_MHZ 4915200
/* NOTE: @@ -199,6 +201,12 @@ static int ad7192_calibrate_all(struct a ARRAY_SIZE(ad7192_calib_arr)); }
+static inline bool ad7192_valid_external_frequency(u32 freq) +{ + return (freq >= AD7192_EXT_FREQ_MHZ_MIN && + freq <= AD7192_EXT_FREQ_MHZ_MAX); +} + static int ad7192_setup(struct ad7192_state *st, const struct ad7192_platform_data *pdata) { @@ -224,17 +232,20 @@ static int ad7192_setup(struct ad7192_st id);
switch (pdata->clock_source_sel) { - case AD7192_CLK_EXT_MCLK1_2: - case AD7192_CLK_EXT_MCLK2: - st->mclk = AD7192_INT_FREQ_MHZ; - break; case AD7192_CLK_INT: case AD7192_CLK_INT_CO: - if (pdata->ext_clk_hz) - st->mclk = pdata->ext_clk_hz; - else - st->mclk = AD7192_INT_FREQ_MHZ; + st->mclk = AD7192_INT_FREQ_MHZ; break; + case AD7192_CLK_EXT_MCLK1_2: + case AD7192_CLK_EXT_MCLK2: + if (ad7192_valid_external_frequency(pdata->ext_clk_hz)) { + st->mclk = pdata->ext_clk_hz; + break; + } + dev_err(&st->sd.spi->dev, "Invalid frequency setting %u\n", + pdata->ext_clk_hz); + ret = -EINVAL; + goto out; default: ret = -EINVAL; goto out;
Patches currently in stable-queue which might be from alexandru.ardelean@analog.com are
queue-4.4/staging-iio-adc-ad7192-fix-external-frequency-setting.patch