On Mon, Apr 22, 2019 at 08:48:56AM +0000, Leonard Crestez wrote: > On 4/22/2019 9:46 AM, Anson Huang wrote: > >> -----Original Message----- > >> From: Anson Huang > >>> From: Shawn Guo [mailto:shawn...@kernel.org] > >>> On Sun, Apr 21, 2019 at 03:40:00PM +0800, Shawn Guo wrote: > >>>> On Thu, Apr 11, 2019 at 06:49:12AM +0000, Anson Huang wrote: > >>>>> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller > >>>>> inside, the system controller is in charge of controlling power, > >>>>> clock and fuse etc.. > >>>>> > >>>>> This patch adds i.MX system controller soc driver support, Linux > >>>>> kernel has to communicate with system controller via MU (message > >>>>> unit) IPC to get soc revision, uid etc.. > >>>>> > >>>>> With this patch, soc info can be read from sysfs: > >>>>> > >>>>> drivers/soc/imx/Kconfig | 7 ++ > >>>>> drivers/soc/imx/Makefile | 1 + > >>>>> drivers/soc/imx/soc-imx-sc.c | 220 > >>>>> +++++++++++++++++++++++++++++++++++++++++++ > >>>>> 3 files changed, 228 insertions(+) create mode 100644 > >>>>> drivers/soc/imx/soc-imx-sc.c > >>>> > >>>> Rather than creating a new driver, please take a look at Abel's > >>>> generic > >>>> i.MX8 SoC driver, and see if it can be extended to cover i.MX8QXP. > >> > >> Got it, I didn't notice that this patch bas been accepted, I will redo the > >> patch > >> based on it, thanks. > > > > I have sent the new patch set to support i.MX8QXP SoC revision based on > > generic i.MX8 > > SoC driver, however, the Kconfig modification is NOT good, it may break > > i.MX8MQ if IMX_SCU > > is NOT enabled, although we can add some warp function for SCU firmware API > > call to fix it, > > but after further thought and discussion with Dong Aisheng, I think we may > > need to roll back to > > use this patch series to create a new SoC driver dedicated for i.MX8 SoCs > > with system controller inside, such as i.MX8QXP, i.MX8QM etc., the reason > > are as below: > > > > For i.MX8MQ/i.MX8MM: > > 1. SoC driver does NOT depends on i.MX SCU firmware, so no need to use > > platform driver > > probe model, just device_init phase call is good enough; > > 2. The SoC driver no need to depends on IMX_SCU, so it can be always > > built in, no need to > > check IMX_SCU config; > > 3. The fuse check for CPU speed grading, HDCP status, NoC settings etc. > > could be added to this driver, > > but they are ONLY for i.MX8MQ/i.MX8MM etc.. > > For i.MX8QXP/i.MX8QM: > > 1. SoC driver MUST depends on IMX_SCU; > > 2. MUST use platform model to support defer probe; > > 3. No fuse check for CPU speed grading. > > > > So, I guess the reused code for i.MX8MQ and i.MX8QXP is ONLY those part of > > creating SoC id device node (less than > > 30% I think), all other functions are implemented in total different ways, > > that is why I created the imx_sc_soc driver > > in this patch series, so do you think we can add new SoC driver for i.MX8 > > SoC with SCU inside? Putting 2 different architecture > > SoCs' driver into 1 file looks like NOT making enough sense. > > +1 for separate SOC driver. The 8mq/8mm and 8qm/8qxp families are very > different, they just happen to share the imx8 prefix. > > It makes sense to allow people to compile one without the other and this > is easier with distinct SOC drivers.
Leonard, Abel, Can you guys help review the patch? Thanks. Shawn
