[PATCH v1] spi: spi-mtk-nor: add axi clock control for MT8192 spi-nor
Bayi Cheng
bayi.cheng at mediatek.com
Wed Nov 11 03:55:02 EST 2020
From: bayi cheng <bayi.cheng at mediatek.com>
MT8192 spi-nor is an independent sub system, we need extra control axi
bus clock for it. Add support for the additional axi clock to allow it
to be configured appropriately.
Signed-off-by: bayi cheng <bayi.cheng at mediatek.com>
---
drivers/spi/spi-mtk-nor.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index b97f26a..bf2d0f9 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -103,6 +103,7 @@ struct mtk_nor {
dma_addr_t buffer_dma;
struct clk *spi_clk;
struct clk *ctlr_clk;
+ struct clk *axi_clk;
unsigned int spi_freq;
bool wbuf_en;
bool has_irq;
@@ -672,6 +673,7 @@ static void mtk_nor_disable_clk(struct mtk_nor *sp)
{
clk_disable_unprepare(sp->spi_clk);
clk_disable_unprepare(sp->ctlr_clk);
+ clk_disable_unprepare(sp->axi_clk);
}
static int mtk_nor_enable_clk(struct mtk_nor *sp)
@@ -688,6 +690,13 @@ static int mtk_nor_enable_clk(struct mtk_nor *sp)
return ret;
}
+ ret = clk_prepare_enable(sp->axi_clk);
+ if (ret) {
+ clk_disable_unprepare(sp->spi_clk);
+ clk_disable_unprepare(sp->ctlr_clk);
+ return ret;
+ }
+
return 0;
}
@@ -746,7 +755,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
struct spi_controller *ctlr;
struct mtk_nor *sp;
void __iomem *base;
- struct clk *spi_clk, *ctlr_clk;
+ struct clk *spi_clk, *ctlr_clk, *axi_clk;
int ret, irq;
unsigned long dma_bits;
@@ -762,6 +771,10 @@ static int mtk_nor_probe(struct platform_device *pdev)
if (IS_ERR(ctlr_clk))
return PTR_ERR(ctlr_clk);
+ axi_clk = devm_clk_get_optional(&pdev->dev, "axi");
+ if (IS_ERR(axi_clk))
+ return PTR_ERR(axi_clk);
+
dma_bits = (unsigned long)of_device_get_match_data(&pdev->dev);
if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(dma_bits))) {
dev_err(&pdev->dev, "failed to set dma mask(%lu)\n", dma_bits);
@@ -794,6 +807,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
sp->dev = &pdev->dev;
sp->spi_clk = spi_clk;
sp->ctlr_clk = ctlr_clk;
+ sp->axi_clk = axi_clk;
sp->high_dma = (dma_bits > 32);
sp->buffer = dmam_alloc_coherent(&pdev->dev,
MTK_NOR_BOUNCE_BUF_SIZE + MTK_NOR_DMA_ALIGN,
--
1.9.1
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