On 03/31, Jose Abreu wrote:
>
> arch/arc/boot/dts/axs10x_mb.dtsi | 5 ++
Please remove this diff from this patch. dts changes go through
non-clk trees.
> drivers/clk/Makefile | 1 +
> drivers/clk/axs10x/Makefile | 1 +
> drivers/clk/axs10x/i2s_pll_clock.c | 163
> +++++++++++++++++++++++++++++++++++++
Where is the binding document?
> diff --git a/drivers/clk/axs10x/i2s_pll_clock.c
> b/drivers/clk/axs10x/i2s_pll_clock.c
> new file mode 100644
> index 0000000..f050e70
> --- /dev/null
> +++ b/drivers/clk/axs10x/i2s_pll_clock.c
> @@ -0,0 +1,163 @@
> +/* FPGA Version Info */
> +#define FPGA_VER_INFO 0xE0011230
> +#define FPGA_VER_27M 0x000FBED9
> +
> +/* PLL registers addresses */
> +#define PLL_IDIV_ADDR 0xE00100A0
> +#define PLL_FBDIV_ADDR 0xE00100A4
> +#define PLL_ODIV0_ADDR 0xE00100A8
> +#define PLL_ODIV1_ADDR 0xE00100AC
> +
> +struct i2s_pll_cfg {
> + unsigned int rate;
> + unsigned int idiv;
> + unsigned int fbdiv;
> + unsigned int odiv0;
> + unsigned int odiv1;
> +};
> +
> +static struct i2s_pll_cfg i2s_pll_cfg_27m[] = {
const?
> + /* 27 Mhz */
> + { 1024000, 0x104, 0x451, 0x10E38, 0x2000 },
> + { 1411200, 0x104, 0x596, 0x10D35, 0x2000 },
> + { 1536000, 0x208, 0xA28, 0x10B2C, 0x2000 },
> + { 2048000, 0x82, 0x451, 0x10E38, 0x2000 },
> + { 2822400, 0x82, 0x596, 0x10D35, 0x2000 },
> + { 3072000, 0x104, 0xA28, 0x10B2C, 0x2000 },
> + { 2116800, 0x82, 0x3CF, 0x10C30, 0x2000 },
> + { 2304000, 0x104, 0x79E, 0x10B2C, 0x2000 },
> + { 0, 0, 0, 0, 0 },
> +};
> +
> +static struct i2s_pll_cfg i2s_pll_cfg_28m[] = {
const?
> + /* 28.224 Mhz */
> + { 1024000, 0x82, 0x105, 0x107DF, 0x2000 },
> + { 1411200, 0x28A, 0x1, 0x10001, 0x2000 },
> + { 1536000, 0xA28, 0x187, 0x10042, 0x2000 },
> + { 2048000, 0x41, 0x105, 0x107DF, 0x2000 },
> + { 2822400, 0x145, 0x1, 0x10001, 0x2000 },
> + { 3072000, 0x514, 0x187, 0x10042, 0x2000 },
> + { 2116800, 0x514, 0x42, 0x10001, 0x2000 },
> + { 2304000, 0x619, 0x82, 0x10001, 0x2000 },
> + { 0, 0, 0, 0, 0 },
> +};
> +
> +struct i2s_pll_clk {
> + struct clk_hw hw;
> + unsigned long ref_clk;
> + struct i2s_pll_cfg *pll_cfg;
> +};
> +
> +static inline struct i2s_pll_clk *to_i2s_pll_clk(struct clk_hw *hw)
> +{
> + return container_of(hw, struct i2s_pll_clk, hw);
> +}
> +
> +static unsigned int i2s_pll_get_value(unsigned int val)
> +{
> + return ((val & 0x3F) + ((val >> 6) & 0x3F));
Please drop extraneous parentheses.
> +}
> +
> +static unsigned long i2s_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct i2s_pll_clk *clk = to_i2s_pll_clk(hw);
> + unsigned int idiv, fbdiv, odiv;
> +
> + idiv = i2s_pll_get_value(readl((void *)PLL_IDIV_ADDR));
We need a real ioremap in this driver instead of casting physical
addresses to pointers and calling readl on them.
> + fbdiv = i2s_pll_get_value(readl((void *)PLL_FBDIV_ADDR));
> + odiv = i2s_pll_get_value(readl((void *)PLL_ODIV0_ADDR));
> +
> + return (((clk->ref_clk / idiv ) * fbdiv) / odiv);
Again, too many parentheses. Also, any concerns of 32-bit
truncation here (i.e. is 64-bit math needed)?
> +}
> +
> +static long i2s_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *prate)
> +{
> + /* TODO: Round rate to nearest valid rate */
At the least this should return the rate from the table if it's
there or failure if it isn't an exact match. Basically do exactly
what i2s_pll_set_rate() is doing without changing the rate.
> + return rate;
> +}
> +
> +static int i2s_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct i2s_pll_cfg *pll_cfg = to_i2s_pll_clk(hw)->pll_cfg;
> + int i;
> +
> + for (i = 0; pll_cfg[i].rate != 0; i++) {
> + if (pll_cfg[i].rate == rate) {
> + writel(pll_cfg[i].idiv, (void *)PLL_IDIV_ADDR);
> + writel(pll_cfg[i].fbdiv, (void *)PLL_FBDIV_ADDR);
> + writel(pll_cfg[i].odiv0, (void *)PLL_ODIV0_ADDR);
> + writel(pll_cfg[i].odiv1, (void *)PLL_ODIV1_ADDR);
> + return 0;
> + }
> + }
> +
> + pr_err("%s: invalid rate=%ld, parent_rate=%ld\n", __func__,
> + rate, parent_rate);
> + return -EINVAL;
> +}
> +
> +static const struct clk_ops i2s_pll_ops = {
> + .recalc_rate = i2s_pll_recalc_rate,
> + .round_rate = i2s_pll_round_rate,
> + .set_rate = i2s_pll_set_rate,
> +};
> +
> +static void __init i2s_pll_clk_setup(struct device_node *node)
> +{
> + const char *clk_name = node->name;
> + struct clk *clk;
> + struct i2s_pll_clk *pll_clk;
> + struct clk_init_data init;
> +
> + pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
> + if (!pll_clk)
> + return;
> +
> + init.name = clk_name;
> + init.ops = &i2s_pll_ops;
> + init.flags = CLK_IS_BASIC;
Drop CLK_IS_BASIC unless you actually need it.
> + init.num_parents = 0;
> + pll_clk->hw.init = &init;
> +
> + clk = clk_register(NULL, &pll_clk->hw);
> + if (IS_ERR(clk)) {
> + pr_err("%s: failed to register %s div clock (%ld)\n",
> + __func__, clk_name, PTR_ERR(clk));
> + goto free_clock;
> + }
> +
> + if (readl((void *)FPGA_VER_INFO) <= FPGA_VER_27M) {
> + pll_clk->ref_clk = 27000000;
Refclk sounds like parent clk. Perhaps the DTS file should have a
fixes rate reference clk for this clk and then we could use
parent/child relationships in the clk framework to pass the
parent rate to the recalc/round_rate ops? I presume that the FPGA
info isn't in the same device/region as this clk is.
> + pll_clk->pll_cfg = i2s_pll_cfg_27m;
> + } else {
> + pll_clk->ref_clk = 28224000;
> + pll_clk->pll_cfg = i2s_pll_cfg_28m;
> + }
> +
> + of_clk_add_provider(node, of_clk_src_simple_get, clk);
> + return;
> +
> +free_clock:
> + kfree(pll_clk);
> +}
> +
> +CLK_OF_DECLARE(i2s_pll_clk, "snps,i2s-pll-clock", i2s_pll_clk_setup);
> +
Can this be a platform driver instead of using CLK_OF_DECLARE?
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc
