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https://github.com/brain-hackers/u-boot-brain
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rtc: add dm_rtc_read helper and ->read method
Some users may want to read multiple consecutive 8-bit registers. Instead of each caller having to implement the loop, provide a dm_rtc_read() helper. Also, allow a driver to provide a ->read method, which can be more efficient than reading one register at a time. Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
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@ -40,6 +40,25 @@ int dm_rtc_reset(struct udevice *dev)
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return ops->reset(dev);
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return ops->reset(dev);
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}
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}
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int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len)
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{
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struct rtc_ops *ops = rtc_get_ops(dev);
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assert(ops);
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if (ops->read)
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return ops->read(dev, reg, buf, len);
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if (!ops->read8)
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return -ENOSYS;
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while (len--) {
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int ret = ops->read8(dev, reg++);
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if (ret < 0)
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return ret;
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*buf++ = ret;
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}
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return 0;
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}
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int rtc_read8(struct udevice *dev, unsigned int reg)
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int rtc_read8(struct udevice *dev, unsigned int reg)
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{
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{
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struct rtc_ops *ops = rtc_get_ops(dev);
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struct rtc_ops *ops = rtc_get_ops(dev);
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@ -55,6 +55,18 @@ struct rtc_ops {
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*/
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*/
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int (*reset)(struct udevice *dev);
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int (*reset)(struct udevice *dev);
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/**
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* read() - Read multiple 8-bit registers
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*
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* @dev: Device to read from
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* @reg: First register to read
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* @buf: Output buffer
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* @len: Number of registers to read
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* @return 0 if OK, -ve on error
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*/
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int (*read)(struct udevice *dev, unsigned int reg,
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u8 *buf, unsigned int len);
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/**
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/**
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* read8() - Read an 8-bit register
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* read8() - Read an 8-bit register
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*
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*
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@ -109,6 +121,17 @@ int dm_rtc_set(struct udevice *dev, struct rtc_time *time);
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*/
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*/
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int dm_rtc_reset(struct udevice *dev);
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int dm_rtc_reset(struct udevice *dev);
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/**
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* dm_rtc_read() - Read multiple 8-bit registers
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*
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* @dev: Device to read from
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* @reg: First register to read
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* @buf: Output buffer
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* @len: Number of registers to read
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* @return 0 if OK, -ve on error
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*/
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int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len);
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/**
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/**
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* rtc_read8() - Read an 8-bit register
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* rtc_read8() - Read an 8-bit register
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*
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*
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