[0/2] clk: imx: Make the dram_apb and dram_alt as read-only

Message

Abel Vesa Oct. 21, 2020, 12:40 p.m. UTC

On i.MX8M platforms the dram_apb and dram_alt are controlled from EL3.
So in order to keep track of the actual clock tree in kernel, we need
to actually declare the clocks but never actually change their parents
or divider settings. We do that by marking the mux and the div as read-only
with CLK_DIVIDER_READ_ONLY and CLK_MUX_READ_ONLY flags.

Abel Vesa (2):
  clk: imx: composite-8m: Add DRAM clock registration variant
  clk: imx8m: Use dram variant registration for dram clocks

 drivers/clk/imx/clk-composite-8m.c | 7 +++++++
 drivers/clk/imx/clk-imx8mm.c       | 4 ++--
 drivers/clk/imx/clk-imx8mn.c       | 4 ++--
 drivers/clk/imx/clk-imx8mp.c       | 4 ++--
 drivers/clk/imx/clk-imx8mq.c       | 4 ++--
 drivers/clk/imx/clk.h              | 6 ++++++
 6 files changed, 21 insertions(+), 8 deletions(-)

Comments

Abel Vesa Oct. 21, 2020, 2:35 p.m. UTC | #1

On 20-10-21 15:40:41, Abel Vesa wrote:
> On i.MX8M platforms the dram_apb and dram_alt are controlled from EL3.
> So in order to keep track of the actual clock tree in kernel, we need
> to actually declare the clocks but never actually change their parents
> or divider settings. We do that by marking the mux and the div as read-only
> with CLK_DIVIDER_READ_ONLY and CLK_MUX_READ_ONLY flags.
> 

Ignore this patchset entirely. A lot of things are missing for this approach.

> Abel Vesa (2):
>   clk: imx: composite-8m: Add DRAM clock registration variant
>   clk: imx8m: Use dram variant registration for dram clocks
> 
>  drivers/clk/imx/clk-composite-8m.c | 7 +++++++
>  drivers/clk/imx/clk-imx8mm.c       | 4 ++--
>  drivers/clk/imx/clk-imx8mn.c       | 4 ++--
>  drivers/clk/imx/clk-imx8mp.c       | 4 ++--
>  drivers/clk/imx/clk-imx8mq.c       | 4 ++--
>  drivers/clk/imx/clk.h              | 6 ++++++
>  6 files changed, 21 insertions(+), 8 deletions(-)
> 
> -- 
> 2.7.4
>