On 28. 05. 20 11:27, Michal Simek wrote: > HI Robert and Heiko, > > po 28. 10. 2019 v 19:32 odesÃlatel Robert Beckett > <bob.beck...@collabora.com> napsal: >> >> Add ability to specify paritions for eeprom in device tree, and >> query eeprom device sizes. Each partition creates a child device, >> allowing board code to find the eeprom parition by name. >> >> >> Robert Beckett (2): misc: i2c_eeprom: add fixed partitions >> support misc: i2c_eeprom: add size query >> >> drivers/misc/i2c_eeprom.c | 243 >> +++++++++++++++++++++++++++++++++++--- include/i2c_eeprom.h >> | 12 ++ 2 files changed, 236 insertions(+), 19 deletions(-) > > What's the recommended way to work with i2c_eeprom_partitions? > > I have them probed but curious how I should work with them. i2c > 1 [ + ] i2c_mux_bus_drv | | |-- > i2c@ff030000->i2c-mux@74->i2c@0 i2c_eeprom 0 [ + ] i2c_eeprom > | | | `-- eeprom@54 i2c_eeprom 1 [ ] > i2c_eeprom_partition | | | |-- board-sn@0 i2c_eeprom 2 > [ ] i2c_eeprom_partition | | | |-- eth-mac@20 > i2c_eeprom 3 [ ] i2c_eeprom_partition | | | |-- > board-name@d0 i2c_eeprom 4 [ ] i2c_eeprom_partition | | > | `-- board-revision@e0 > > Is there any u-boot command for reading values from these > partitions? Or are you just referencing them by > fdt_path_offset/uclass_get_device_by_of_offset?
I think I found that path you use.
13 bootcount {
14 compatible = "u-boot,bootcount-i2c-eeprom";
15 i2c-eeprom = <&bootcount>;
16 };
24 &eeprom {
25 partitions {
26 compatible = "fixed-partitions";
27
28 vpd {
29 offset = <0>;
30 size = <1022>;
31 };
32
32
33 bootcount: bootcount {
34 offset = <1022>;
35 size = <2>;
36 };
37 };
38 };
I am curious about these offset/size properties which you are using
here which are out of dt spec in the kernel.
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/devicetree/bindings/mtd/partition.txt?h=next-20200526
Why not just to use reg property which does exactly it?
Anyway and then you use link to bootcount and code in
drivers/bootcount/i2c-eeprom.c to read it.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs
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