diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-meson-spicc.c | 54 |
1 files changed, 46 insertions, 8 deletions
diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c index 351ccd8dd2c2..77f7d0e0e46a 100644 --- a/drivers/spi/spi-meson-spicc.c +++ b/drivers/spi/spi-meson-spicc.c @@ -147,6 +147,7 @@ struct meson_spicc_data { unsigned int fifo_size; bool has_oen; bool has_enhance_clk_div; + bool has_pclk; }; struct meson_spicc_device { @@ -154,6 +155,7 @@ struct meson_spicc_device { struct platform_device *pdev; void __iomem *base; struct clk *core; + struct clk *pclk; struct clk *clk; struct spi_message *message; struct spi_transfer *xfer; @@ -514,6 +516,10 @@ static void meson_spicc_cleanup(struct spi_device *spi) * Clk path for AXG series: * src -> pow2 fixed div -> pow2 div -> mux -> out * src -> enh fixed div -> enh div -> mux -> out + * + * Clk path for G12A series: + * pclk -> pow2 fixed div -> pow2 div -> mux -> out + * pclk -> enh fixed div -> enh div -> mux -> out */ static int meson_spicc_clk_init(struct meson_spicc_device *spicc) @@ -542,7 +548,10 @@ static int meson_spicc_clk_init(struct meson_spicc_device *spicc) init.name = name; init.ops = &clk_fixed_factor_ops; init.flags = 0; - parent_data[0].hw = __clk_get_hw(spicc->core); + if (spicc->data->has_pclk) + parent_data[0].hw = __clk_get_hw(spicc->pclk); + else + parent_data[0].hw = __clk_get_hw(spicc->core); init.num_parents = 1; pow2_fixed_div->mult = 1, @@ -589,7 +598,10 @@ static int meson_spicc_clk_init(struct meson_spicc_device *spicc) init.name = name; init.ops = &clk_fixed_factor_ops; init.flags = 0; - parent_data[0].hw = __clk_get_hw(spicc->core); + if (spicc->data->has_pclk) + parent_data[0].hw = __clk_get_hw(spicc->pclk); + else + parent_data[0].hw = __clk_get_hw(spicc->core); init.num_parents = 1; enh_fixed_div->mult = 1, @@ -648,7 +660,7 @@ static int meson_spicc_probe(struct platform_device *pdev) { struct spi_master *master; struct meson_spicc_device *spicc; - int ret, irq, rate; + int ret, irq; master = spi_alloc_master(&pdev->dev, sizeof(*spicc)); if (!master) { @@ -697,12 +709,26 @@ static int meson_spicc_probe(struct platform_device *pdev) goto out_master; } + if (spicc->data->has_pclk) { + spicc->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(spicc->pclk)) { + dev_err(&pdev->dev, "pclk clock request failed\n"); + ret = PTR_ERR(spicc->pclk); + goto out_master; + } + } + ret = clk_prepare_enable(spicc->core); if (ret) { dev_err(&pdev->dev, "core clock enable failed\n"); goto out_master; } - rate = clk_get_rate(spicc->core); + + ret = clk_prepare_enable(spicc->pclk); + if (ret) { + dev_err(&pdev->dev, "pclk clock enable failed\n"); + goto out_master; + } device_reset_optional(&pdev->dev); @@ -715,6 +741,7 @@ static int meson_spicc_probe(struct platform_device *pdev) SPI_BPW_MASK(8); master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX); master->min_speed_hz = spicc->data->min_speed_hz; + master->max_speed_hz = spicc->data->max_speed_hz; master->setup = meson_spicc_setup; master->cleanup = meson_spicc_cleanup; master->prepare_message = meson_spicc_prepare_message; @@ -722,10 +749,6 @@ static int meson_spicc_probe(struct platform_device *pdev) master->transfer_one = meson_spicc_transfer_one; master->use_gpio_descriptors = true; - /* Setup max rate according to the Meson datasheet */ - master->max_speed_hz = min_t(unsigned int, rate >> 1, - spicc->data->max_speed_hz); - meson_spicc_oen_enable(spicc); ret = meson_spicc_clk_init(spicc); @@ -744,6 +767,7 @@ static int meson_spicc_probe(struct platform_device *pdev) out_clk: clk_disable_unprepare(spicc->core); + clk_disable_unprepare(spicc->pclk); out_master: spi_master_put(master); @@ -759,6 +783,7 @@ static int meson_spicc_remove(struct platform_device *pdev) writel(0, spicc->base + SPICC_CONREG); clk_disable_unprepare(spicc->core); + clk_disable_unprepare(spicc->pclk); return 0; } @@ -777,6 +802,15 @@ static const struct meson_spicc_data meson_spicc_axg_data = { .has_enhance_clk_div = true, }; +static const struct meson_spicc_data meson_spicc_g12a_data = { + .max_speed_hz = 166666666, + .min_speed_hz = 50000, + .fifo_size = 15, + .has_oen = true, + .has_enhance_clk_div = true, + .has_pclk = true, +}; + static const struct of_device_id meson_spicc_of_match[] = { { .compatible = "amlogic,meson-gx-spicc", @@ -786,6 +820,10 @@ static const struct of_device_id meson_spicc_of_match[] = { .compatible = "amlogic,meson-axg-spicc", .data = &meson_spicc_axg_data, }, + { + .compatible = "amlogic,meson-g12a-spicc", + .data = &meson_spicc_g12a_data, + }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, meson_spicc_of_match); |