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Date:   Fri, 27 Apr 2018 11:53:47 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     David Lechner <david@...hnology.com>
Cc:     linux-clk@...r.kernel.org,
        linux-devicetree <devicetree@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Adam Ford <aford173@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 26/27] ARM: davinci: da8xx-dt: switch to device tree clocks

2018-04-27 2:17 GMT+02:00 David Lechner <david@...hnology.com>:
> This removes all of the clock init code from da8xx-dt.c. This includes
> all of the OF_DEV_AUXDATA that was just used for looking up clocks.
>
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>
> v9 changes:
> - changes to arch/arm/mach-davinci/time.c accidentally got squashed into this
>   commit. will drop this later.
>
> v8 changes:
> - none
>
> v7 changes:
> - rebased
> - drop of_platform_default_populate(NULL, NULL, NULL)
> - add change in pm_domain.c
>
> v6 changes:
> - removed misleading statement from commit message
>
>
>  arch/arm/mach-davinci/da8xx-dt.c  | 58 -------------------------------
>  arch/arm/mach-davinci/pm_domain.c |  5 +++
>  arch/arm/mach-davinci/time.c      |  9 ++---
>  3 files changed, 10 insertions(+), 62 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
> index 088bc5c0318b..23ac4108f812 100644
> --- a/arch/arm/mach-davinci/da8xx-dt.c
> +++ b/arch/arm/mach-davinci/da8xx-dt.c
> @@ -19,67 +19,10 @@
>  #include "cp_intc.h"
>  #include <mach/da8xx.h>
>
> -static struct of_dev_auxdata da850_aemif_auxdata_lookup[] = {
> -       OF_DEV_AUXDATA("ti,davinci-nand", 0x62000000, "davinci-nand.0", NULL),
> -       {}
> -};
> -
> -static struct aemif_platform_data aemif_data = {
> -       .dev_lookup = da850_aemif_auxdata_lookup,
> -};
> -
> -static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
> -       OF_DEV_AUXDATA("ti,davinci-i2c", 0x01c22000, "i2c_davinci.1", NULL),
> -       OF_DEV_AUXDATA("ti,davinci-i2c", 0x01e28000, "i2c_davinci.2", NULL),
> -       OF_DEV_AUXDATA("ti,davinci-wdt", 0x01c21000, "davinci-wdt", NULL),
> -       OF_DEV_AUXDATA("ti,da830-mmc", 0x01c40000, "da830-mmc.0", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ehrpwm", 0x01f00000, "ehrpwm.0", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ehrpwm", 0x01f02000, "ehrpwm.1", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ecap", 0x01f06000, "ecap.0", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ecap", 0x01f07000, "ecap.1", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ecap", 0x01f08000, "ecap.2", NULL),
> -       OF_DEV_AUXDATA("ti,da830-spi", 0x01c41000, "spi_davinci.0", NULL),
> -       OF_DEV_AUXDATA("ti,da830-spi", 0x01f0e000, "spi_davinci.1", NULL),
> -       OF_DEV_AUXDATA("ns16550a", 0x01c42000, "serial8250.0", NULL),
> -       OF_DEV_AUXDATA("ns16550a", 0x01d0c000, "serial8250.1", NULL),
> -       OF_DEV_AUXDATA("ns16550a", 0x01d0d000, "serial8250.2", NULL),
> -       OF_DEV_AUXDATA("ti,davinci_mdio", 0x01e24000, "davinci_mdio.0", NULL),
> -       OF_DEV_AUXDATA("ti,davinci-dm6467-emac", 0x01e20000, "davinci_emac.1",
> -                      NULL),
> -       OF_DEV_AUXDATA("ti,da830-mcasp-audio", 0x01d00000, "davinci-mcasp.0", NULL),
> -       OF_DEV_AUXDATA("ti,da850-aemif", 0x68000000, "ti-aemif", &aemif_data),
> -       OF_DEV_AUXDATA("ti,da850-tilcdc", 0x01e13000, "da8xx_lcdc.0", NULL),
> -       OF_DEV_AUXDATA("ti,da830-ohci", 0x01e25000, "ohci-da8xx", NULL),
> -       OF_DEV_AUXDATA("ti,da830-musb", 0x01e00000, "musb-da8xx", NULL),
> -       OF_DEV_AUXDATA("ti,da830-usb-phy", 0x01c1417c, "da8xx-usb-phy", NULL),
> -       OF_DEV_AUXDATA("ti,da850-ahci", 0x01e18000, "ahci_da850", NULL),
> -       OF_DEV_AUXDATA("ti,da850-vpif", 0x01e17000, "vpif", NULL),
> -       OF_DEV_AUXDATA("ti,da850-dsp", 0x11800000, "davinci-rproc.0", NULL),
> -       {}
> -};
> -
>  #ifdef CONFIG_ARCH_DAVINCI_DA850
>
>  static void __init da850_init_machine(void)
>  {
> -       /* All existing boards use 100MHz SATA refclkpn */
> -       static const unsigned long sata_refclkpn = 100 * 1000 * 1000;
> -
> -       int ret;
> -
> -       da850_register_clocks();
> -
> -       ret = da8xx_register_usb_phy_clocks();
> -       if (ret)
> -               pr_warn("%s: USB PHY CLK registration failed: %d\n",
> -                       __func__, ret);
> -
> -       ret = da850_register_sata_refclk(sata_refclkpn);
> -       if (ret)
> -               pr_warn("%s: registering SATA REFCLK failed: %d",
> -                       __func__, ret);
> -
> -       of_platform_default_populate(NULL, da850_auxdata_lookup, NULL);
>         davinci_pm_init();
>         pdata_quirks_init();
>  }
> @@ -94,7 +37,6 @@ static const char *const da850_boards_compat[] __initconst = {
>
>  DT_MACHINE_START(DA850_DT, "Generic DA850/OMAP-L138/AM18x")
>         .map_io         = da850_init,
> -       .init_time      = da850_init_time,
>         .init_machine   = da850_init_machine,
>         .dt_compat      = da850_boards_compat,
>         .init_late      = davinci_init_late,
> diff --git a/arch/arm/mach-davinci/pm_domain.c b/arch/arm/mach-davinci/pm_domain.c
> index 78eac2c0c146..e251fd593bfd 100644
> --- a/arch/arm/mach-davinci/pm_domain.c
> +++ b/arch/arm/mach-davinci/pm_domain.c
> @@ -13,6 +13,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/pm_clock.h>
>  #include <linux/platform_device.h>
> +#include <linux/of.h>
>
>  static struct dev_pm_domain davinci_pm_domain = {
>         .ops = {
> @@ -28,6 +29,10 @@ static struct pm_clk_notifier_block platform_bus_notifier = {
>
>  static int __init davinci_pm_runtime_init(void)
>  {
> +       if (of_have_populated_dt())
> +               return 0;
> +
> +       /* Use pm_clk as fallback if we're not using genpd. */
>         pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
>
>         return 0;
> diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
> index 7a8c6fada644..77ad95913dfa 100644
> --- a/arch/arm/mach-davinci/time.c
> +++ b/arch/arm/mach-davinci/time.c
> @@ -409,11 +409,12 @@ static int __init of_davinci_timer_init(struct device_node *np)
>
>                 /*
>                  * Fall back to using ref_clk if the actual clock is not
> -                * available. This currently always happens because platform
> -                * clocks (i.e PLLs and PSCs) are registered as platform
> -                * devices and therefore are not available at this point in
> -                * the boot process.
> +                * available. There will be problems later if the real clock
> +                * source is disabled.
>                  */
> +
> +               pr_warn("%s: falling back to ref_clk\n", __func__);
> +
>                 clkspec.np = of_find_node_by_name(NULL, "ref_clk");
>                 if (IS_ERR(clkspec.np)) {
>                         pr_err("%s: No clock available for timer!\n", __func__);
> --
> 2.17.0
>

The following headers can be removed:

-#include <linux/io.h>
-#include <linux/of_irq.h>
-#include <linux/of_platform.h>
-#include <linux/irqdomain.h>
-#include <linux/platform_data/ti-aemif.h>
-#include "cp_intc.h"

Thanks,
Bart

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