RE: [PATCH V2 2/4] clk: imx: imx8mq: use imx8m_clk_hw_composite_core

[Peng Fan]

> Subject: Re: [PATCH V2 2/4] clk: imx: imx8mq: use
> imx8m_clk_hw_composite_core
> 
> On Tue, Jan 14, 2020 at 04:49:20PM +0000, Leonard Crestez wrote:
> > On 10.01.2020 09:17, Peng Fan wrote:
> > > From: Peng Fan <peng.fan@xxxxxxx>
> > >
> > > Use imx8m_clk_hw_composite_core to simplify code.
> > >
> > > Reviewed-by: Abel Vesa <abel.vesa@xxxxxxx>
> > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> > > ---
> > >   drivers/clk/imx/clk-imx8mq.c | 19 +++++--------------
> > >   1 file changed, 5 insertions(+), 14 deletions(-)
> > >
> > > diff --git a/drivers/clk/imx/clk-imx8mq.c
> > > b/drivers/clk/imx/clk-imx8mq.c index 4c0edca1a6d0..b031183ff427
> > > 100644
> > > --- a/drivers/clk/imx/clk-imx8mq.c
> > > +++ b/drivers/clk/imx/clk-imx8mq.c
> > > @@ -403,22 +403,13 @@ static int imx8mq_clocks_probe(struct
> > > platform_device *pdev)
> > >
> > >   	/* CORE */
> > >   	hws[IMX8MQ_CLK_A53_SRC] = imx_clk_hw_mux2("arm_a53_src",
> base + 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels));
> > > -	hws[IMX8MQ_CLK_M4_SRC] = imx_clk_hw_mux2("arm_m4_src", base
> + 0x8080, 24, 3, imx8mq_arm_m4_sels, ARRAY_SIZE(imx8mq_arm_m4_sels));
> > > -	hws[IMX8MQ_CLK_VPU_SRC] = imx_clk_hw_mux2("vpu_src", base +
> 0x8100, 24, 3, imx8mq_vpu_sels, ARRAY_SIZE(imx8mq_vpu_sels));
> > > -	hws[IMX8MQ_CLK_GPU_CORE_SRC] =
> imx_clk_hw_mux2("gpu_core_src", base + 0x8180, 24, 3,
> imx8mq_gpu_core_sels, ARRAY_SIZE(imx8mq_gpu_core_sels));
> > > -	hws[IMX8MQ_CLK_GPU_SHADER_SRC] =
> imx_clk_hw_mux2("gpu_shader_src", base + 0x8200, 24, 3,
> imx8mq_gpu_shader_sels,  ARRAY_SIZE(imx8mq_gpu_shader_sels));
> > > -
> > >   	hws[IMX8MQ_CLK_A53_CG] =
> imx_clk_hw_gate3_flags("arm_a53_cg", "arm_a53_src", base + 0x8000, 28,
> CLK_IS_CRITICAL);
> > > -	hws[IMX8MQ_CLK_M4_CG] = imx_clk_hw_gate3("arm_m4_cg",
> "arm_m4_src", base + 0x8080, 28);
> > > -	hws[IMX8MQ_CLK_VPU_CG] = imx_clk_hw_gate3("vpu_cg", "vpu_src",
> base + 0x8100, 28);
> > > -	hws[IMX8MQ_CLK_GPU_CORE_CG] = imx_clk_hw_gate3("gpu_core_cg",
> "gpu_core_src", base + 0x8180, 28);
> > > -	hws[IMX8MQ_CLK_GPU_SHADER_CG] =
> imx_clk_hw_gate3("gpu_shader_cg", "gpu_shader_src", base + 0x8200, 28);
> > > -
> > >   	hws[IMX8MQ_CLK_A53_DIV] =
> imx_clk_hw_divider2("arm_a53_div", "arm_a53_cg", base + 0x8000, 0, 3);
> > > -	hws[IMX8MQ_CLK_M4_DIV] = imx_clk_hw_divider2("arm_m4_div",
> "arm_m4_cg", base + 0x8080, 0, 3);
> > > -	hws[IMX8MQ_CLK_VPU_DIV] = imx_clk_hw_divider2("vpu_div",
> "vpu_cg", base + 0x8100, 0, 3);
> > > -	hws[IMX8MQ_CLK_GPU_CORE_DIV] =
> imx_clk_hw_divider2("gpu_core_div", "gpu_core_cg", base + 0x8180, 0, 3);
> > > -	hws[IMX8MQ_CLK_GPU_SHADER_DIV] =
> imx_clk_hw_divider2("gpu_shader_div", "gpu_shader_cg", base + 0x8200, 0,
> 3);
> > > +
> > > +	hws[IMX8MQ_CLK_M4_DIV] =
> imx8m_clk_hw_composite_core("arm_m4_div", imx8mq_arm_m4_sels, base
> + 0x8080);
> > > +	hws[IMX8MQ_CLK_VPU_DIV] =
> imx8m_clk_hw_composite_core("vpu_div", imx8mq_vpu_sels, base +
> 0x8100);
> > > +	hws[IMX8MQ_CLK_GPU_CORE_DIV] =
> imx8m_clk_hw_composite_core("gpu_core_div", imx8mq_gpu_core_sels,
> base + 0x8180);
> > > +	hws[IMX8MQ_CLK_GPU_SHADER_DIV] =
> > > +imx8m_clk_hw_composite("gpu_shader_div", imx8mq_gpu_shader_sels,
> > > +base + 0x8200);
> > >
> > >   	/* BUS */
> > >   	hws[IMX8MQ_CLK_MAIN_AXI] =
> > > imx8m_clk_hw_composite_critical("main_axi", imx8mq_main_axi_sels,
> > > base + 0x8800);
> >
> > Collapsing _SRC _CG into _DIV is an useful simplification but it
> > technically breaks DT compatibility rules.
> >
> > Inside imx8mq.dtsi there are clock assignments for
> > IMX8MQ_CLK_GPU_CORE_SRC and IMX8MQ_CLK_GPU_SHADER_SRC
> which no longer
> > exist so those assignments don't take effect.
> 
> We do not want to break existing DTBs for this case.  Patches dropped.

I'll send a v3 to address the issues. Sorry.

Thanks,
Peng.

> 
> Shawn