29.05.2019 11:21, Joseph Lo пишет:
> Remove the old emc_mux clock and don't use the common EMC clock
> definition. This will be replaced by a new clock defined in the
> EMC driver.
>
> Signed-off-by: Joseph Lo <josephl@xxxxxxxxxx>
> ---
> v4:
> - make sure the behavior is compatible with case if the kernel still
> uses the older DTB which doesn't have EMC node. And the MC and EMC
> clock can still be registered successuflly.
> v3:
> - split to 3 patches from the previous version
> ---
> drivers/clk/tegra/clk-tegra210.c | 42 ++++++++++++++++++++------------
> 1 file changed, 27 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
> index 1d52354820ca..8b209e8b5eaf 100644
> --- a/drivers/clk/tegra/clk-tegra210.c
> +++ b/drivers/clk/tegra/clk-tegra210.c
> @@ -28,6 +28,7 @@
> #include <dt-bindings/reset/tegra210-car.h>
> #include <linux/iopoll.h>
> #include <linux/sizes.h>
> +#include <soc/tegra/emc.h>
> #include <soc/tegra/pmc.h>
>
> #include "clk.h"
> @@ -324,12 +325,6 @@ static unsigned long tegra210_input_freq[] = {
> [8] = 12000000,
> };
>
> -static const char *mux_pllmcp_clkm[] = {
> - "pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud", "pll_mb", "pll_mb",
> - "pll_p",
> -};
> -#define mux_pllmcp_clkm_idx NULL
> -
> #define PLL_ENABLE (1 << 30)
>
> #define PLLCX_MISC1_IDDQ (1 << 27)
> @@ -2346,7 +2341,6 @@ static struct tegra_clk tegra210_clks[tegra_clk_max] __initdata = {
> [tegra_clk_i2c2] = { .dt_id = TEGRA210_CLK_I2C2, .present = true },
> [tegra_clk_uartc_8] = { .dt_id = TEGRA210_CLK_UARTC, .present = true },
> [tegra_clk_mipi_cal] = { .dt_id = TEGRA210_CLK_MIPI_CAL, .present = true },
> - [tegra_clk_emc] = { .dt_id = TEGRA210_CLK_EMC, .present = true },
> [tegra_clk_usb2] = { .dt_id = TEGRA210_CLK_USB2, .present = true },
> [tegra_clk_bsev] = { .dt_id = TEGRA210_CLK_BSEV, .present = true },
> [tegra_clk_uartd_8] = { .dt_id = TEGRA210_CLK_UARTD, .present = true },
> @@ -2957,6 +2951,27 @@ static int tegra210_init_pllu(void)
> return 0;
> }
>
> +static const struct clk_div_table mc_div_table_tegra210[] = {
> + { .val = 0, .div = 2 },
> + { .val = 1, .div = 4 },
> + { .val = 2, .div = 1 },
> + { .val = 3, .div = 2 },
> + { .val = 0, .div = 0 },
> +};
> +
> +static void tegra210_clk_register_mc(const char *name,
> + const char *parent_name)
> +{
> + struct clk *clk;
> +
> + clk = clk_register_divider_table(NULL, name, parent_name,
> + CLK_IS_CRITICAL,
> + clk_base + CLK_SOURCE_EMC,
> + 15, 2, CLK_DIVIDER_READ_ONLY,
> + mc_div_table_tegra210, &emc_lock);
This doesn't look right, you're mixing up the MC divider with the EMC
divider here. The MC clock is always sourced from EMC and there is only
one bit for the MC divider, the bit 16 MC_EMC_SAME_FREQ.
When EMC clock is divided down by 2 (bit 15 EMC_CLK_DIV2_EN), then the
clk-framework will take care of it by calculating the MC rate based on
the actual parent EMC rate.
> + clks[TEGRA210_CLK_MC] = clk;
> +}
> +
> static const char * const sor1_out_parents[] = {
> /*
> * Bit 0 of the mux selects sor1_pad_clkout, irrespective of bit 1, so
> @@ -3040,15 +3055,12 @@ static __init void tegra210_periph_clk_init(void __iomem *clk_base,
> CLK_SOURCE_LA, 0);
> clks[TEGRA210_CLK_LA] = clk;
>
> - /* emc mux */
> - clk = clk_register_mux(NULL, "emc_mux", mux_pllmcp_clkm,
> - ARRAY_SIZE(mux_pllmcp_clkm), 0,
> - clk_base + CLK_SOURCE_EMC,
> - 29, 3, 0, &emc_lock);
> + /* emc */
> + clk = tegra210_clk_register_emc();
> + clks[TEGRA210_CLK_EMC] = clk;
>
> - clk = tegra_clk_register_mc("mc", "emc_mux", clk_base + CLK_SOURCE_EMC,
> - &emc_lock);
> - clks[TEGRA210_CLK_MC] = clk;
> + /* mc */
> + tegra210_clk_register_mc("mc", "emc");
>
> /* cml0 */
> clk = clk_register_gate(NULL, "cml0", "pll_e", 0, clk_base + PLLE_AUX,
>
You should leave the common tegra_clk_register_mc() usage as-is and only
s/emc_mux/emc/ in the argument.
--
Dmitry
