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SubjectRE: [v4,1/3] soc: fsl: handle RCPM errata A-008646 on SoC LS1021A
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Hi all,
the linux patch depended by RCPM driver,FlexTimer driver and FlexTimer dts, need apply these patches as follows:

1. RCPM driver:

https://patchwork.kernel.org/series/162731/mbox/ (https://patchwork.kernel.org/patch/11105279/)

2. FlexTimer dts:

https://lore.kernel.org/patchwork/series/405653/mbox/ (https://lore.kernel.org/patchwork/patch/1112493/)

3. FlexTimer driver:

https://patchwork.ozlabs.org/series/124718/mbox/ (https://patchwork.ozlabs.org/patch/1145999/)

https://patchwork.ozlabs.org/series/126942/mbox/ (https://patchwork.ozlabs.org/patch/1152085/)

4. Adjust drivers/soc/fsl/Makefile:

remove the line 'obj-y += ftm_alarm.o' in drivers/soc/fsl/Makefile to resolve a compilation error

> Description:
> - Reading configuration register RCPM_IPPDEXPCR1
> always return zero
>
> Workaround:
> - Save register RCPM_IPPDEXPCR1's value to
> register SCFG_SPARECR8.(uboot's psci also
> need reading value from the register SCFG_SPARECR8
> to set register RCPM_IPPDEXPCR1)
>
> Impact:
> - FlexTimer module will cannot wakeup system in
> deep sleep on SoC LS1021A
>
> Signed-off-by: Biwen Li <biwen.li@nxp.com>
> ---
> Change in v4:
> - rename property name
> fsl,ippdexpcr-alt-addr -> fsl,ippdexpcr1-alt-addr
>
> Change in v3:
> - update commit message
> - rename property name
> fsl,rcpm-scfg -> fsl,ippdexpcr-alt-addr
>
> Change in v2:
> - fix stype problems
>
> drivers/soc/fsl/rcpm.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c index
> 82c0ad5e663e..9a29c482fc2e 100644
> --- a/drivers/soc/fsl/rcpm.c
> +++ b/drivers/soc/fsl/rcpm.c
> @@ -13,6 +13,8 @@
> #include <linux/slab.h>
> #include <linux/suspend.h>
> #include <linux/kernel.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
>
> #define RCPM_WAKEUP_CELL_MAX_SIZE 7
>
> @@ -29,6 +31,9 @@ static int rcpm_pm_prepare(struct device *dev)
> struct rcpm *rcpm;
> u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp;
> int i, ret, idx;
> + struct regmap *scfg_addr_regmap = NULL;
> + u32 reg_offset[RCPM_WAKEUP_CELL_MAX_SIZE + 1];
> + u32 reg_value = 0;
>
> rcpm = dev_get_drvdata(dev);
> if (!rcpm)
> @@ -63,6 +68,34 @@ static int rcpm_pm_prepare(struct device *dev)
> tmp |= value[i + 1];
> iowrite32be(tmp, rcpm->ippdexpcr_base + i * 4);
> }
> + /* Workaround of errata A-008646 on SoC LS1021A:
> + * There is a bug of register ippdexpcr1.
> + * Reading configuration register RCPM_IPPDEXPCR1
> + * always return zero. So save ippdexpcr1's value
> + * to register SCFG_SPARECR8.And the value of
> + * ippdexpcr1 will be read from SCFG_SPARECR8.
> + */
> + scfg_addr_regmap =
> syscon_regmap_lookup_by_phandle(np,
> +
> "fsl,ippdexpcr1-alt-addr");
> + if (scfg_addr_regmap && (1 == i)) {
> + if (of_property_read_u32_array(dev->of_node,
> + "fsl,ippdexpcr1-alt-addr",
> + reg_offset,
> + 1 + sizeof(u64)/sizeof(u32))) {
> + scfg_addr_regmap = NULL;
> + continue;
> + }
> + /* Read value from register SCFG_SPARECR8 */
> + regmap_read(scfg_addr_regmap,
> + (u32)(((u64)(reg_offset[1] << (sizeof(u32) *
> 8) |
> + reg_offset[2])) & 0xffffffff),
> + &reg_value);
> + /* Write value to register SCFG_SPARECR8 */
> + regmap_write(scfg_addr_regmap,
> + (u32)(((u64)(reg_offset[1] << (sizeof(u32) *
> 8) |
> + reg_offset[2])) & 0xffffffff),
> + tmp | reg_value);
> + }
> }
> }
> } while (ws = wakeup_source_get_next(ws));
> --
> 2.17.1

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