Hello all,
On 10/27/2015 01:08 PM, Przemyslaw Marczak wrote:
This commit adds:
- new uclass id: UCLASS_ADC
- new uclass driver: drivers/adc/adc-uclass.c
The new uclass's API allows for ADC operation on:
* single-channel with channel selection by a number
* multti-channel with channel selection by bit mask
ADC uclass's functions:
* single-channel:
- adc_start_channel() - start channel conversion
- adc_channel_data() - get conversion data
- adc_channel_single_shot() - start/get conversion data
* multi-channel:
- adc_start_channels() - start selected channels conversion
- adc_channels_data() - get conversion data
- adc_channels_single_shot() - start/get conversion data for channels
selected by bit mask
* general:
- adc_stop() - stop the conversion
- adc_vdd_value() - positive reference Voltage value with polarity [uV]
- adc_vss_value() - negative reference Voltage value with polarity [uV]
- adc_data_mask() - conversion data bit mask
The device tree can provide below constraints/properties:
- vdd-polarity-negative: if true: Vdd = vdd-microvolts * (-1)
- vss-polarity-negative: if true: Vss = vss-microvolts * (-1)
- vdd-supply: phandle to Vdd regulator's node
- vss-supply: phandle to Vss regulator's node
And optional, checked only if the above corresponding, doesn't exist:
- vdd-microvolts: positive reference Voltage [uV]
- vss-microvolts: negative reference Voltage [uV]
Signed-off-by: Przemyslaw Marczak <[email protected]>
Cc: Simon Glass <[email protected]>
---
Changes V2:
- new commit - introduce ADC uclass driver
Changes V3:
- Add binding info
- ADC uclass's code rework, add single/multi-channel API
- Select single channel by a number and multi, by a bit mask
- Wait for conversion end in uclass's internal function
- Add ADC supply polarity constraint
- Add function for getting supply Voltage with polarity
---
doc/device-tree-bindings/adc/adc.txt | 62 ++++++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/adc/Kconfig | 12 +
drivers/adc/Makefile | 8 +
drivers/adc/adc-uclass.c | 409 +++++++++++++++++++++++++++++++++++
include/adc.h | 288 ++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
8 files changed, 783 insertions(+)
create mode 100644 doc/device-tree-bindings/adc/adc.txt
create mode 100644 drivers/adc/Kconfig
create mode 100644 drivers/adc/Makefile
create mode 100644 drivers/adc/adc-uclass.c
create mode 100644 include/adc.h
--- cut ---
diff --git a/drivers/adc/adc-uclass.c b/drivers/adc/adc-uclass.c
new file mode 100644
index 0000000..9233fcd
--- /dev/null
+++ b/drivers/adc/adc-uclass.c
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ * Przemyslaw Marczak <[email protected]>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <dm/lists.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
+#include <adc.h>
+#include <power/regulator.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define ADC_UCLASS_PLATDATA_SIZE sizeof(struct adc_uclass_platdata)
+#define CHECK_NUMBER true
+#define CHECK_MASK (!CHECK_NUMBER)
+
+/* TODO: add support for timer uclass (for early calls) */
+#ifdef CONFIG_SANDBOX_ARCH
+#define sdelay(x) udelay(x)
+#else
+extern void sdelay(unsigned long loops);
+#endif
--- cut ---
I would like precise the sdelay() calls in this code.
I didn't make the cleanup for the sdelay(), as Simon requested.
For some architectures it's declared in a different headers, but we have
timer uclass now, so this sdelay mess can be used temporary.
Now, I don't have time for moving Exynos timer to driver model.
And also it should be done as a separated patch set.
Best regards,
--
Przemyslaw Marczak
Samsung R&D Institute Poland
Samsung Electronics
[email protected]
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