linux-kernel - Re: [PATCH 2/2] clk: qcom: gcc: Add global clock controller driver for QCS404

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Date:   Mon, 8 Oct 2018 09:21:44 +0530
From:   Vinod <vkoul@...nel.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Shefali Jain <shefjain@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Anu Ramanathan <anur@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>
Subject: Re: [PATCH 2/2] clk: qcom: gcc: Add global clock controller driver
 for QCS404

On 07-10-18, 19:38, Stephen Boyd wrote:
> Quoting Vinod (2018-10-02 23:21:03)
> > Hi Stephen,
> > 
> > Thanks for the comments,
> > 
> > On 01-10-18, 10:19, Stephen Boyd wrote:
> > > Quoting Vinod Koul (2018-09-21 11:59:36)
> > > > From: Shefali Jain <shefjain@...eaurora.org>
> > > > 
> > > > Add the clocks supported in global clock controller which clock the
> > > > peripherals like BLSPs, SDCC, USB, MDSS etc. Register all the clocks
> > > > to the clock framework for the clients to be able to request for them.
> > > > 
> > > > Signed-off-by: Shefali Jain <shefjain@...eaurora.org>
> > > > Signed-off-by: Taniya Das <tdas@...eaurora.org>
> > > > Co-developed-by: Taniya Das <tdas@...eaurora.org>
> > > > Signed-off-by: Anu Ramanathan <anur@...eaurora.org>
> > > > [rebase and tidyup for upstream]
> > > 
> > > Who did the tidying?
> > 
> > both of us :)
> 
> OK, please add the username of both people per the kernel sign off
> standards.
> 
> > > > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > > Signed-off-by: Vinod Koul <vkoul@...nel.org>

Sorry not sure I understand, Bjorn and me did cleanup and we signed-off
per process, did I miss something?

> > > > +#include <linux/kernel.h>
> > > > +#include <linux/platform_device.h>
> > > > +#include <linux/module.h>
> > > > +#include <linux/of.h>
> > > > +#include <linux/clk.h>
> > > 
> > > Please don't include this.
> > 
> > OK will check if this is required, any reason for not including this?
> 
> So we can easily split clk consumers and clk providers.

That was my thought, thanks for confirming :)

> > > > +static struct clk_branch gcc_pwm1_xo512_clk = {
> > > > +       .halt_reg = 0x49004,
> > > > +       .halt_check = BRANCH_HALT,
> > > > +       .clkr = {
> > > > +               .enable_reg = 0x49004,
> > > > +               .enable_mask = BIT(0),
> > > > +               .hw.init = &(struct clk_init_data){
> > > > +                       .name = "gcc_pwm1_xo512_clk",
> > > > +                       .ops = &clk_branch2_ops,
> > > 
> > > Do these pwm clks have a parent clk of the XO?
> > 
> > Yes they do
> 
> Cool, we should add them or add a comment explaining why they don't have
> parents listed here.

ok

> > > > +       [GCC_USB_HS_PHY_CFG_AHB_CLK] = &gcc_usb_hs_phy_cfg_ahb_clk.clkr,
> > > > +       [GCC_USB_HS_SYSTEM_CLK] = &gcc_usb_hs_system_clk.clkr,
> > > > +       [GFX3D_CLK_SRC] = &gfx3d_clk_src.clkr,
> > > > +       [GP1_CLK_SRC] = &gp1_clk_src.clkr,
> > > 
> > > Why are some of these missing GCC_ prefix?
> > 
> > will add..
> 
> Thanks!

Btw Taniya also commented on this, do you want this as GCC_ or as per hw
documentation?

> > > > +       clk_prepare_enable(apss_ahb_clk_src.clkr.hw.clk);
> > > > +       clk_prepare_enable(gpll0_ao_out_main.clkr.hw.clk);
> > > 
> > > And these should be marked as critical clocks.
> > 
> > Okay and how do we go about doing that?
> 
> You mark the clk flags with CLK_IS_CRITICAL.

Thanks will do.


-- 
~Vinod